Plugin to Display A Latitude/Longitude Grid on Flutter_map

lat_lon_grid_plugin

Adds a latitude / longitude grid as plugin to the flutter_map.

Getting Started

Example application under /example/:

Example

Usage

dependencies:
  flutter_map: any
  lat_lon_grid_plugin: any

Include the FlutterMap into your widget tree.

Please note: Make sure to place the MapPluginLatLonGridOptions() right after TileLayerOptions() so it does not consume touch events from other layer widgets.

  FlutterMap(
    mapController: _mapController,
    options: MapOptions(
      center: LatLng(51.814, -2.170),
      zoom: 6.15,
      rotation: 0.0,
      plugins: [
        MapPluginLatLonGrid(),
      ],
    ),
    layers: [
      TileLayerOptions(
        urlTemplate:
            'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
        subdomains: ['a', 'b', 'c'],
      ),
      MapPluginLatLonGridOptions(
        lineWidth: 0.5,
        // apply alpha for grid lines
        lineColor: Color.fromARGB(100, 0, 0, 0),
        textColor: Colors.white,
        textBackgroundColor: Colors.black,
        showCardinalDirections: true,
        showCardinalDirectionsAsPrefix: false,
        textSize: 12.0,
        showLabels: true,
        rotateLonLabels: true,
        placeLabelsOnLines: true,
        offsetLonTextBottom: 20.0,
        offsetLatTextLeft: 20.0,
      ),
    ],
  ),

Use this package as a library

Depend on it

Run this command:

With Flutter:

 $ flutter pub add lat_lon_grid_plugin

This will add a line like this to your package's pubspec.yaml (and run an implicit flutter pub get):

dependencies:
  lat_lon_grid_plugin: ^0.2.2

Alternatively, your editor might support or flutter pub get. Check the docs for your editor to learn more.

Import it

Now in your Dart code, you can use:

import 'package:lat_lon_grid_plugin/lat_lon_grid_plugin.dart'; 

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:lat_lon_grid_plugin/lat_lon_grid_plugin.dart';
import 'package:latlong2/latlong.dart';

void main() => runApp(MyApp());

/// Sample application
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Lat lon grid example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: HomePage(),
    );
  }
}

/// HomePage which shows the use of the plugin
class HomePage extends StatefulWidget {
  /// constructor for the HomePage widget
  HomePage({Key? key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  MapController? _mapController;
  String _sLatLonZoom = '';

  void _resetRotation() {
    _mapController!.rotate(0);
    setState(_updateLabel);
  }

  void _updateLabel() {
    if (_mapController != null) {
      String lat = _mapController!.center.latitude.toStringAsFixed(3);
      String lon = _mapController!.center.longitude.toStringAsFixed(3);
      String zoom = _mapController!.zoom.toStringAsFixed(2);
      String rotation = _mapController!.rotation.toStringAsFixed(2);

      // don't trigger rebuild while building aka. when the first build didn't finish yet
      if (_sLatLonZoom == '') {
        _sLatLonZoom = 'lat: $lat lon: $lon\nzoom: $zoom rotation: $rotation';
      } else {
        setState(() {
          _sLatLonZoom = 'lat: $lat lon: $lon\nzoom: $zoom rotation: $rotation';
        });
      }
    }
  }

  @override
  void initState() {
    super.initState();
    _mapController = MapController();
    // hacked together
    // https://stackoverflow.com/questions/49466556/flutter-run-method-on-widget-build-complete
    WidgetsBinding.instance!.addPostFrameCallback((_) => _updateLabel());
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Example'),
        actions: <Widget>[
          SizedBox(
            height: 50.0,
            width: 250.0,
            child: Container(
              height: 80.0,
              color: Colors.blue,
              child: Column(
                children: <Widget>[
                  Text(
                    _sLatLonZoom,
                    style: TextStyle(color: Colors.white, fontSize: 17.0),
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
      body: Stack(
        children: <Widget>[
          FlutterMap(
            mapController: _mapController,
            options: MapOptions(
              center: LatLng(51.814, -2.170),
              zoom: 6.15,
              rotation: 0.0,
              onPositionChanged: (position, hasGesture) => _updateLabel(),
              plugins: [
                MapPluginLatLonGrid(),
              ],
            ),
            layers: [
              TileLayerOptions(
                urlTemplate:
                    'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
                subdomains: ['a', 'b', 'c'],
              ),
              MapPluginLatLonGridOptions(
                lineWidth: 0.5,
                // apply alpha for grid lines
                lineColor: Color.fromARGB(100, 0, 0, 0),
                textColor: Colors.white,
                textBackgroundColor: Colors.black,
                showCardinalDirections: true,
                showCardinalDirectionsAsPrefix: false,
                textSize: 12.0,
                showLabels: true,
                rotateLonLabels: true,
                placeLabelsOnLines: true,
                offsetLonTextBottom: 20.0,
                offsetLatTextLeft: 20.0,
              ),
            ],
          ),
          Padding(
            padding: EdgeInsets.only(top: 5.0, right: 5.0),
            child: Align(
              alignment: Alignment.topRight,
              child: SizedBox(
                height: 50.0,
                width: 200.0,
                child: Container(
                  color: Colors.white,
                  child: TextButton(
                    child: Text(
                      'Reset Rotation',
                      style: TextStyle(fontSize: 20.0),
                    ),
                    onPressed: _resetRotation,
                  ),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
} 

Download Details:

Author: matthiasdittmer

Source Code: https://github.com/matthiasdittmer/lat_lon_grid_plugin

#flutter #maps 
 

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Plugin to Display A Latitude/Longitude Grid on Flutter_map

How To Customize WordPress Plugins? (4 Easy Ways To Do)

This is image title
WordPress needs no introduction. It has been in the world for quite a long time. And up till now, it has given a tough fight to leading web development technology. The main reason behind its remarkable success is, it is highly customizable and also SEO-friendly. Other benefits include open-source technology, security, user-friendliness, and the thousands of free plugins it offers.

Talking of WordPress plugins, are a piece of software that enables you to add more features to the website. They are easy to integrate into your website and don’t hamper the performance of the site. WordPress, as a leading technology, has to offer many out-of-the-box plugins.

However, not always the WordPress would be able to meet your all needs. Hence you have to customize the WordPress plugin to provide you the functionality you wished. WordPress Plugins are easy to install and customize. You don’t have to build the solution from scratch and that’s one of the reasons why small and medium-sized businesses love it. It doesn’t need a hefty investment or the hiring of an in-house development team. You can use the core functionality of the plugin and expand it as your like.

In this blog, we would be talking in-depth about plugins and how to customize WordPress plugins to improve the functionality of your web applications.

What Is The Working Of The WordPress Plugins?

Developing your own plugin requires you to have some knowledge of the way they work. It ensures the better functioning of the customized plugins and avoids any mistakes that can hamper the experience on your site.

1. Hooks

Plugins operate primarily using hooks. As a hook attaches you to something, the same way a feature or functionality is hooked to your website. The piece of code interacts with the other components present on the website. There are two types of hooks: a. Action and b. Filter.

A. Action

If you want something to happen at a particular time, you need to use a WordPress “action” hook. With actions, you can add, change and improve the functionality of your plugin. It allows you to attach a new action that can be triggered by your users on the website.

There are several predefined actions available on WordPress, custom WordPress plugin development also allows you to develop your own action. This way you can make your plugin function as your want. It also allows you to set values for which the hook function. The add_ action function will then connect that function to a specific action.

B. Filters

They are the type of hooks that are accepted to a single variable or a series of variables. It sends them back after they have modified it. It allows you to change the content displayed to the user.

You can add the filter on your website with the apply_filter function, then you can define the filter under the function. To add a filter hook on the website, you have to add the $tag (the filter name) and $value (the filtered value or variable), this allows the hook to work. Also, you can add extra function values under $var.

Once you have made your filter, you can execute it with the add_filter function. This will activate your filter and would work when a specific function is triggered. You can also manipulate the variable and return it.

2. Shortcodes

Shortcodes are a good way to create and display the custom functionality of your website to visitors. They are client-side bits of code. They can be placed in the posts and pages like in the menu and widgets, etc.

There are many plugins that use shortcodes. By creating your very own shortcode, you too can customize the WordPress plugin. You can create your own shortcode with the add_shortcode function. The name of the shortcode that you use would be the first variable and the second variable would be the output of it when it is triggered. The output can be – attributes, content, and name.

3. Widgets

Other than the hooks and shortcodes, you can use the widgets to add functionality to the site. WordPress Widgets are a good way to create a widget by extending the WP_Widget class. They render a user-friendly experience, as they have an object-oriented design approach and the functions and values are stored in a single entity.

How To Customize WordPress Plugins?

There are various methods to customize the WordPress plugins. Depending on your need, and the degree of customization you wish to make in the plugin, choose the right option for you. Also, don’t forget to keep in mind that it requires a little bit of technical knowledge too. So find an expert WordPress plugin development company in case you lack the knowledge to do it by yourself.

1. Hire A Plugin Developer3
This is image title

One of the best ways to customize a WordPress plugin is by hiring a plugin developer. There are many plugin developers listed in the WordPress directory. You can contact them and collaborate with world-class WordPress developers. It is quite easy to find a WordPress plugin developer.

Since it is not much work and doesn’t pay well or for the long term a lot of developers would be unwilling to collaborate but, you will eventually find people.

2. Creating A Supporting Plugin

If you are looking for added functionality in an already existing plugin go for this option. It is a cheap way to meet your needs and creating a supporting plugin takes very little time as it has very limited needs. Furthermore, you can extend a plugin to a current feature set without altering its base code.

However, to do so, you have to hire a WordPress developer as it also requires some technical knowledge.

3. Use Custom Hooks

Use the WordPress hooks to integrate some other feature into an existing plugin. You can add an action or a filter as per your need and improve the functionality of the website.

If the plugin you want to customize has the hook, you don’t have to do much to customize it. You can write your own plugin that works with these hooks. This way you don’t have to build a WordPress plugin right from scratch. If the hook is not present in the plugin code, you can contact a WordPress developer or write the code yourself. It may take some time, but it works.

Once the hook is added, you just have to manually patch each one upon the release of the new plugin update.

4. Override Callbacks

The last way to customize WordPress plugins is by override callbacks. You can alter the core functionality of the WordPress plugin with this method. You can completely change the way it functions with your website. It is a way to completely transform the plugin. By adding your own custom callbacks, you can create the exact functionality you desire.

We suggest you go for a web developer proficient in WordPress as this requires a good amount of technical knowledge and the working of a plugin.

Read More

#customize wordpress plugins #how to customize plugins in wordpress #how to customize wordpress plugins #how to edit plugins in wordpress #how to edit wordpress plugins #wordpress plugin customization

Face Recognition with OpenCV and Python

Introduction

What is face recognition? Or what is recognition? When you look at an apple fruit, your mind immediately tells you that this is an apple fruit. This process, your mind telling you that this is an apple fruit is recognition in simple words. So what is face recognition then? I am sure you have guessed it right. When you look at your friend walking down the street or a picture of him, you recognize that he is your friend Paulo. Interestingly when you look at your friend or a picture of him you look at his face first before looking at anything else. Ever wondered why you do that? This is so that you can recognize him by looking at his face. Well, this is you doing face recognition.

But the real question is how does face recognition works? It is quite simple and intuitive. Take a real life example, when you meet someone first time in your life you don't recognize him, right? While he talks or shakes hands with you, you look at his face, eyes, nose, mouth, color and overall look. This is your mind learning or training for the face recognition of that person by gathering face data. Then he tells you that his name is Paulo. At this point your mind knows that the face data it just learned belongs to Paulo. Now your mind is trained and ready to do face recognition on Paulo's face. Next time when you will see Paulo or his face in a picture you will immediately recognize him. This is how face recognition work. The more you will meet Paulo, the more data your mind will collect about Paulo and especially his face and the better you will become at recognizing him.

Now the next question is how to code face recognition with OpenCV, after all this is the only reason why you are reading this article, right? OK then. You might say that our mind can do these things easily but to actually code them into a computer is difficult? Don't worry, it is not. Thanks to OpenCV, coding face recognition is as easier as it feels. The coding steps for face recognition are same as we discussed it in real life example above.

  • Training Data Gathering: Gather face data (face images in this case) of the persons you want to recognize
  • Training of Recognizer: Feed that face data (and respective names of each face) to the face recognizer so that it can learn.
  • Recognition: Feed new faces of the persons and see if the face recognizer you just trained recognizes them.

OpenCV comes equipped with built in face recognizer, all you have to do is feed it the face data. It's that simple and this how it will look once we are done coding it.

visualization

OpenCV Face Recognizers

OpenCV has three built in face recognizers and thanks to OpenCV's clean coding, you can use any of them by just changing a single line of code. Below are the names of those face recognizers and their OpenCV calls.

  1. EigenFaces Face Recognizer Recognizer - cv2.face.createEigenFaceRecognizer()
  2. FisherFaces Face Recognizer Recognizer - cv2.face.createFisherFaceRecognizer()
  3. Local Binary Patterns Histograms (LBPH) Face Recognizer - cv2.face.createLBPHFaceRecognizer()

We have got three face recognizers but do you know which one to use and when? Or which one is better? I guess not. So why not go through a brief summary of each, what you say? I am assuming you said yes :) So let's dive into the theory of each.

EigenFaces Face Recognizer

This algorithm considers the fact that not all parts of a face are equally important and equally useful. When you look at some one you recognize him/her by his distinct features like eyes, nose, cheeks, forehead and how they vary with respect to each other. So you are actually focusing on the areas of maximum change (mathematically speaking, this change is variance) of the face. For example, from eyes to nose there is a significant change and same is the case from nose to mouth. When you look at multiple faces you compare them by looking at these parts of the faces because these parts are the most useful and important components of a face. Important because they catch the maximum change among faces, change the helps you differentiate one face from the other. This is exactly how EigenFaces face recognizer works.

EigenFaces face recognizer looks at all the training images of all the persons as a whole and try to extract the components which are important and useful (the components that catch the maximum variance/change) and discards the rest of the components. This way it not only extracts the important components from the training data but also saves memory by discarding the less important components. These important components it extracts are called principal components. Below is an image showing the principal components extracted from a list of faces.

Principal Components eigenfaces_opencv source

You can see that principal components actually represent faces and these faces are called eigen faces and hence the name of the algorithm.

So this is how EigenFaces face recognizer trains itself (by extracting principal components). Remember, it also keeps a record of which principal component belongs to which person. One thing to note in above image is that Eigenfaces algorithm also considers illumination as an important component.

Later during recognition, when you feed a new image to the algorithm, it repeats the same process on that image as well. It extracts the principal component from that new image and compares that component with the list of components it stored during training and finds the component with the best match and returns the person label associated with that best match component.

Easy peasy, right? Next one is easier than this one.

FisherFaces Face Recognizer

This algorithm is an improved version of EigenFaces face recognizer. Eigenfaces face recognizer looks at all the training faces of all the persons at once and finds principal components from all of them combined. By capturing principal components from all the of them combined you are not focusing on the features that discriminate one person from the other but the features that represent all the persons in the training data as a whole.

This approach has drawbacks, for example, images with sharp changes (like light changes which is not a useful feature at all) may dominate the rest of the images and you may end up with features that are from external source like light and are not useful for discrimination at all. In the end, your principal components will represent light changes and not the actual face features.

Fisherfaces algorithm, instead of extracting useful features that represent all the faces of all the persons, it extracts useful features that discriminate one person from the others. This way features of one person do not dominate over the others and you have the features that discriminate one person from the others.

Below is an image of features extracted using Fisherfaces algorithm.

Fisher Faces eigenfaces_opencv source

You can see that features extracted actually represent faces and these faces are called fisher faces and hence the name of the algorithm.

One thing to note here is that even in Fisherfaces algorithm if multiple persons have images with sharp changes due to external sources like light they will dominate over other features and affect recognition accuracy.

Getting bored with this theory? Don't worry, only one face recognizer is left and then we will dive deep into the coding part.

Local Binary Patterns Histograms (LBPH) Face Recognizer

I wrote a detailed explaination on Local Binary Patterns Histograms in my previous article on face detection using local binary patterns histograms. So here I will just give a brief overview of how it works.

We know that Eigenfaces and Fisherfaces are both affected by light and in real life we can't guarantee perfect light conditions. LBPH face recognizer is an improvement to overcome this drawback.

Idea is to not look at the image as a whole instead find the local features of an image. LBPH alogrithm try to find the local structure of an image and it does that by comparing each pixel with its neighboring pixels.

Take a 3x3 window and move it one image, at each move (each local part of an image), compare the pixel at the center with its neighbor pixels. The neighbors with intensity value less than or equal to center pixel are denoted by 1 and others by 0. Then you read these 0/1 values under 3x3 window in a clockwise order and you will have a binary pattern like 11100011 and this pattern is local to some area of the image. You do this on whole image and you will have a list of local binary patterns.

LBP Labeling LBP labeling

Now you get why this algorithm has Local Binary Patterns in its name? Because you get a list of local binary patterns. Now you may be wondering, what about the histogram part of the LBPH? Well after you get a list of local binary patterns, you convert each binary pattern into a decimal number (as shown in above image) and then you make a histogram of all of those values. A sample histogram looks like this.

Sample Histogram LBP labeling

I guess this answers the question about histogram part. So in the end you will have one histogram for each face image in the training data set. That means if there were 100 images in training data set then LBPH will extract 100 histograms after training and store them for later recognition. Remember, algorithm also keeps track of which histogram belongs to which person.

Later during recognition, when you will feed a new image to the recognizer for recognition it will generate a histogram for that new image, compare that histogram with the histograms it already has, find the best match histogram and return the person label associated with that best match histogram. 

Below is a list of faces and their respective local binary patterns images. You can see that the LBP images are not affected by changes in light conditions.

LBP Faces LBP faces source

The theory part is over and now comes the coding part! Ready to dive into coding? Let's get into it then.

Coding Face Recognition with OpenCV

The Face Recognition process in this tutorial is divided into three steps.

  1. Prepare training data: In this step we will read training images for each person/subject along with their labels, detect faces from each image and assign each detected face an integer label of the person it belongs to.
  2. Train Face Recognizer: In this step we will train OpenCV's LBPH face recognizer by feeding it the data we prepared in step 1.
  3. Testing: In this step we will pass some test images to face recognizer and see if it predicts them correctly.

[There should be a visualization diagram for above steps here]

To detect faces, I will use the code from my previous article on face detection. So if you have not read it, I encourage you to do so to understand how face detection works and its Python coding.

Import Required Modules

Before starting the actual coding we need to import the required modules for coding. So let's import them first.

  • cv2: is OpenCV module for Python which we will use for face detection and face recognition.
  • os: We will use this Python module to read our training directories and file names.
  • numpy: We will use this module to convert Python lists to numpy arrays as OpenCV face recognizers accept numpy arrays.
#import OpenCV module
import cv2
#import os module for reading training data directories and paths
import os
#import numpy to convert python lists to numpy arrays as 
#it is needed by OpenCV face recognizers
import numpy as np

#matplotlib for display our images
import matplotlib.pyplot as plt
%matplotlib inline 

Training Data

The more images used in training the better. Normally a lot of images are used for training a face recognizer so that it can learn different looks of the same person, for example with glasses, without glasses, laughing, sad, happy, crying, with beard, without beard etc. To keep our tutorial simple we are going to use only 12 images for each person.

So our training data consists of total 2 persons with 12 images of each person. All training data is inside training-data folder. training-data folder contains one folder for each person and each folder is named with format sLabel (e.g. s1, s2) where label is actually the integer label assigned to that person. For example folder named s1 means that this folder contains images for person 1. The directory structure tree for training data is as follows:

training-data
|-------------- s1
|               |-- 1.jpg
|               |-- ...
|               |-- 12.jpg
|-------------- s2
|               |-- 1.jpg
|               |-- ...
|               |-- 12.jpg

The test-data folder contains images that we will use to test our face recognizer after it has been successfully trained.

As OpenCV face recognizer accepts labels as integers so we need to define a mapping between integer labels and persons actual names so below I am defining a mapping of persons integer labels and their respective names.

Note: As we have not assigned label 0 to any person so the mapping for label 0 is empty.

#there is no label 0 in our training data so subject name for index/label 0 is empty
subjects = ["", "Tom Cruise", "Shahrukh Khan"]

Prepare training data

You may be wondering why data preparation, right? Well, OpenCV face recognizer accepts data in a specific format. It accepts two vectors, one vector is of faces of all the persons and the second vector is of integer labels for each face so that when processing a face the face recognizer knows which person that particular face belongs too.

For example, if we had 2 persons and 2 images for each person.

PERSON-1    PERSON-2   

img1        img1         
img2        img2

Then the prepare data step will produce following face and label vectors.

FACES                        LABELS

person1_img1_face              1
person1_img2_face              1
person2_img1_face              2
person2_img2_face              2

Preparing data step can be further divided into following sub-steps.

  1. Read all the folder names of subjects/persons provided in training data folder. So for example, in this tutorial we have folder names: s1, s2.
  2. For each subject, extract label number. Do you remember that our folders have a special naming convention? Folder names follow the format sLabel where Label is an integer representing the label we have assigned to that subject. So for example, folder name s1 means that the subject has label 1, s2 means subject label is 2 and so on. The label extracted in this step is assigned to each face detected in the next step.
  3. Read all the images of the subject, detect face from each image.
  4. Add each face to faces vector with corresponding subject label (extracted in above step) added to labels vector.

[There should be a visualization for above steps here]

Did you read my last article on face detection? No? Then you better do so right now because to detect faces, I am going to use the code from my previous article on face detection. So if you have not read it, I encourage you to do so to understand how face detection works and its coding. Below is the same code.

#function to detect face using OpenCV
def detect_face(img):
    #convert the test image to gray image as opencv face detector expects gray images
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    
    #load OpenCV face detector, I am using LBP which is fast
    #there is also a more accurate but slow Haar classifier
    face_cascade = cv2.CascadeClassifier('opencv-files/lbpcascade_frontalface.xml')

    #let's detect multiscale (some images may be closer to camera than others) images
    #result is a list of faces
    faces = face_cascade.detectMultiScale(gray, scaleFactor=1.2, minNeighbors=5);
    
    #if no faces are detected then return original img
    if (len(faces) == 0):
        return None, None
    
    #under the assumption that there will be only one face,
    #extract the face area
    (x, y, w, h) = faces[0]
    
    #return only the face part of the image
    return gray[y:y+w, x:x+h], faces[0]

I am using OpenCV's LBP face detector. On line 4, I convert the image to grayscale because most operations in OpenCV are performed in gray scale, then on line 8 I load LBP face detector using cv2.CascadeClassifier class. After that on line 12 I use cv2.CascadeClassifier class' detectMultiScale method to detect all the faces in the image. on line 20, from detected faces I only pick the first face because in one image there will be only one face (under the assumption that there will be only one prominent face). As faces returned by detectMultiScale method are actually rectangles (x, y, width, height) and not actual faces images so we have to extract face image area from the main image. So on line 23 I extract face area from gray image and return both the face image area and face rectangle.

Now you have got a face detector and you know the 4 steps to prepare the data, so are you ready to code the prepare data step? Yes? So let's do it.

#this function will read all persons' training images, detect face from each image
#and will return two lists of exactly same size, one list 
# of faces and another list of labels for each face
def prepare_training_data(data_folder_path):
    
    #------STEP-1--------
    #get the directories (one directory for each subject) in data folder
    dirs = os.listdir(data_folder_path)
    
    #list to hold all subject faces
    faces = []
    #list to hold labels for all subjects
    labels = []
    
    #let's go through each directory and read images within it
    for dir_name in dirs:
        
        #our subject directories start with letter 's' so
        #ignore any non-relevant directories if any
        if not dir_name.startswith("s"):
            continue;
            
        #------STEP-2--------
        #extract label number of subject from dir_name
        #format of dir name = slabel
        #, so removing letter 's' from dir_name will give us label
        label = int(dir_name.replace("s", ""))
        
        #build path of directory containin images for current subject subject
        #sample subject_dir_path = "training-data/s1"
        subject_dir_path = data_folder_path + "/" + dir_name
        
        #get the images names that are inside the given subject directory
        subject_images_names = os.listdir(subject_dir_path)
        
        #------STEP-3--------
        #go through each image name, read image, 
        #detect face and add face to list of faces
        for image_name in subject_images_names:
            
            #ignore system files like .DS_Store
            if image_name.startswith("."):
                continue;
            
            #build image path
            #sample image path = training-data/s1/1.pgm
            image_path = subject_dir_path + "/" + image_name

            #read image
            image = cv2.imread(image_path)
            
            #display an image window to show the image 
            cv2.imshow("Training on image...", image)
            cv2.waitKey(100)
            
            #detect face
            face, rect = detect_face(image)
            
            #------STEP-4--------
            #for the purpose of this tutorial
            #we will ignore faces that are not detected
            if face is not None:
                #add face to list of faces
                faces.append(face)
                #add label for this face
                labels.append(label)
            
    cv2.destroyAllWindows()
    cv2.waitKey(1)
    cv2.destroyAllWindows()
    
    return faces, labels

I have defined a function that takes the path, where training subjects' folders are stored, as parameter. This function follows the same 4 prepare data substeps mentioned above.

(step-1) On line 8 I am using os.listdir method to read names of all folders stored on path passed to function as parameter. On line 10-13 I am defining labels and faces vectors.

(step-2) After that I traverse through all subjects' folder names and from each subject's folder name on line 27 I am extracting the label information. As folder names follow the sLabel naming convention so removing the letter s from folder name will give us the label assigned to that subject.

(step-3) On line 34, I read all the images names of of the current subject being traversed and on line 39-66 I traverse those images one by one. On line 53-54 I am using OpenCV's imshow(window_title, image) along with OpenCV's waitKey(interval) method to display the current image being traveresed. The waitKey(interval) method pauses the code flow for the given interval (milliseconds), I am using it with 100ms interval so that we can view the image window for 100ms. On line 57, I detect face from the current image being traversed.

(step-4) On line 62-66, I add the detected face and label to their respective vectors.

But a function can't do anything unless we call it on some data that it has to prepare, right? Don't worry, I have got data of two beautiful and famous celebrities. I am sure you will recognize them!

training-data

Let's call this function on images of these beautiful celebrities to prepare data for training of our Face Recognizer. Below is a simple code to do that.

#let's first prepare our training data
#data will be in two lists of same size
#one list will contain all the faces
#and other list will contain respective labels for each face
print("Preparing data...")
faces, labels = prepare_training_data("training-data")
print("Data prepared")

#print total faces and labels
print("Total faces: ", len(faces))
print("Total labels: ", len(labels))
Preparing data...
Data prepared
Total faces:  23
Total labels:  23

This was probably the boring part, right? Don't worry, the fun stuff is coming up next. It's time to train our own face recognizer so that once trained it can recognize new faces of the persons it was trained on. Read? Ok then let's train our face recognizer.

Train Face Recognizer

As we know, OpenCV comes equipped with three face recognizers.

  1. EigenFace Recognizer: This can be created with cv2.face.createEigenFaceRecognizer()
  2. FisherFace Recognizer: This can be created with cv2.face.createFisherFaceRecognizer()
  3. Local Binary Patterns Histogram (LBPH): This can be created with cv2.face.LBPHFisherFaceRecognizer()

I am going to use LBPH face recognizer but you can use any face recognizer of your choice. No matter which of the OpenCV's face recognizer you use the code will remain the same. You just have to change one line, the face recognizer initialization line given below.

#create our LBPH face recognizer 
face_recognizer = cv2.face.createLBPHFaceRecognizer()

#or use EigenFaceRecognizer by replacing above line with 
#face_recognizer = cv2.face.createEigenFaceRecognizer()

#or use FisherFaceRecognizer by replacing above line with 
#face_recognizer = cv2.face.createFisherFaceRecognizer()

Now that we have initialized our face recognizer and we also have prepared our training data, it's time to train the face recognizer. We will do that by calling the train(faces-vector, labels-vector) method of face recognizer.

#train our face recognizer of our training faces
face_recognizer.train(faces, np.array(labels))

Did you notice that instead of passing labels vector directly to face recognizer I am first converting it to numpy array? This is because OpenCV expects labels vector to be a numpy array.

Still not satisfied? Want to see some action? Next step is the real action, I promise!

Prediction

Now comes my favorite part, the prediction part. This is where we actually get to see if our algorithm is actually recognizing our trained subjects's faces or not. We will take two test images of our celeberities, detect faces from each of them and then pass those faces to our trained face recognizer to see if it recognizes them.

Below are some utility functions that we will use for drawing bounding box (rectangle) around face and putting celeberity name near the face bounding box.

#function to draw rectangle on image 
#according to given (x, y) coordinates and 
#given width and heigh
def draw_rectangle(img, rect):
    (x, y, w, h) = rect
    cv2.rectangle(img, (x, y), (x+w, y+h), (0, 255, 0), 2)
    
#function to draw text on give image starting from
#passed (x, y) coordinates. 
def draw_text(img, text, x, y):
    cv2.putText(img, text, (x, y), cv2.FONT_HERSHEY_PLAIN, 1.5, (0, 255, 0), 2)

First function draw_rectangle draws a rectangle on image based on passed rectangle coordinates. It uses OpenCV's built in function cv2.rectangle(img, topLeftPoint, bottomRightPoint, rgbColor, lineWidth) to draw rectangle. We will use it to draw a rectangle around the face detected in test image.

Second function draw_text uses OpenCV's built in function cv2.putText(img, text, startPoint, font, fontSize, rgbColor, lineWidth) to draw text on image.

Now that we have the drawing functions, we just need to call the face recognizer's predict(face) method to test our face recognizer on test images. Following function does the prediction for us.

#this function recognizes the person in image passed
#and draws a rectangle around detected face with name of the 
#subject
def predict(test_img):
    #make a copy of the image as we don't want to chang original image
    img = test_img.copy()
    #detect face from the image
    face, rect = detect_face(img)

    #predict the image using our face recognizer 
    label= face_recognizer.predict(face)
    #get name of respective label returned by face recognizer
    label_text = subjects[label]
    
    #draw a rectangle around face detected
    draw_rectangle(img, rect)
    #draw name of predicted person
    draw_text(img, label_text, rect[0], rect[1]-5)
    
    return img
  • line-6 read the test image
  • line-7 detect face from test image
  • line-11 recognize the face by calling face recognizer's predict(face) method. This method will return a lable
  • line-12 get the name associated with the label
  • line-16 draw rectangle around the detected face
  • line-18 draw name of predicted subject above face rectangle

Now that we have the prediction function well defined, next step is to actually call this function on our test images and display those test images to see if our face recognizer correctly recognized them. So let's do it. This is what we have been waiting for.

print("Predicting images...")

#load test images
test_img1 = cv2.imread("test-data/test1.jpg")
test_img2 = cv2.imread("test-data/test2.jpg")

#perform a prediction
predicted_img1 = predict(test_img1)
predicted_img2 = predict(test_img2)
print("Prediction complete")

#create a figure of 2 plots (one for each test image)
f, (ax1, ax2) = plt.subplots(1, 2, figsize=(10, 5))

#display test image1 result
ax1.imshow(cv2.cvtColor(predicted_img1, cv2.COLOR_BGR2RGB))

#display test image2 result
ax2.imshow(cv2.cvtColor(predicted_img2, cv2.COLOR_BGR2RGB))

#display both images
cv2.imshow("Tom cruise test", predicted_img1)
cv2.imshow("Shahrukh Khan test", predicted_img2)
cv2.waitKey(0)
cv2.destroyAllWindows()
cv2.waitKey(1)
cv2.destroyAllWindows()
Predicting images...
Prediction complete

wohooo! Is'nt it beautiful? Indeed, it is!

End Notes

Face Recognition is a fascinating idea to work on and OpenCV has made it extremely simple and easy for us to code it. It just takes a few lines of code to have a fully working face recognition application and we can switch between all three face recognizers with a single line of code change. It's that simple.

Although EigenFaces, FisherFaces and LBPH face recognizers are good but there are even better ways to perform face recognition like using Histogram of Oriented Gradients (HOGs) and Neural Networks. So the more advanced face recognition algorithms are now a days implemented using a combination of OpenCV and Machine learning. I have plans to write some articles on those more advanced methods as well, so stay tuned!

Download Details:
Author: informramiz
Source Code: https://github.com/informramiz/opencv-face-recognition-python
License: MIT License

#opencv  #python #facerecognition 

7 Best Video Player and Gallery Plugins for WordPress Website in 2021

When you want to watch a video, then you always choose to watch videos on YouTube and go for other popular streaming websites. Although such videos provide amazing watching experience and if you want to make own website that simply allows spectators to watch videos also. At that time you can prefer WordPress, even this is not only that, businesses which mostly tend to make video content and register them on their website. Therefore, you need video player WordPress plugins that makes simpler the entire procedures of dealing with videos on your website. Along with, you get remarkable video players that make an appealing appearance on your website.

Best Video Player WordPress Plugins

WP Video Lightbox

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WP Video LightboxWordPress plugin lets users insert videos right on top of any page by implementing a lightbox intersection screen. The plugin is very convenient when you are keen to show pictures, flash, YouTube, or Vimeo videos on your website. In addition, the plugin is fully approachable, thus, all mobile users like its amazing features.

The plugin assists you by automatically appealing the thumbnail for the Video which you make use of it, although you have a great choice to utilize your thumbnails if you wish for. The plugin also offers you an ideal alternative to restrict recommended video in the last part of a YouTube video, therefore your viewers will not to be unfocused. Additionally, you can buy antivirus online using Amazon Promo Code to protect your system form virus.

Portfolio Designer

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Portfolio Designer is a complete solution for developing an astonishing portfolio, galleries, as well showcase into the WordPress website. The plugin has in-built infinite layout styles such as grid, masonry, slider, WooCommerce, and justify. Additionally, it includes 50+ awesome hover and animation effects to captivate your website visitors instantly. This plugin supports audio and video formats to create fantastic galleries hassle-free.

The plugin has unlimited colors and design options that a user can modify smoothly and introduce the portfolio presentation vividly. It has 800+ Google web fonts, fancy box integration, support unlimited custom post, and so on. A user can get all the functionalities to build an attractive portfolio in just one plugin. With the Portfolio Designer WordPress plugin, there are no restrictions to display the portfolio or galleries to any website page. The plugin is also available in the lite version at the WordPress repository.

ARVE Advanced Responsive Video Embedder

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ARVE Advanced Responsive Video Embedder a well-known and great video implanting plugin for WordPress that is absolutely free of cost. The plugin is packed with multiple amazing features to grab each particular problem you are expected to expression by displaying such videos on your website.

Most importantly, this plugin allows to create the entire videos you insert into responsive videos and this is done just because of your mobile users can take pleasure such astounding experiences with hassle-free. Other alternatives comprise WYSIWYG support, auto-start videos, tweaking URL factors if you wish for, transforming video position, and lots more.

Find more plugins here.

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Top 7 Post Timeline WordPress Plugins

Want to feature a brand history or storyline on a WordPress website? If yes, then read this blog thoroughly.

Many of your website visitors want to know about your brand history or the achievements of your past. For that, a timeline layout is a good solution. Showcase the story of your company or brand in chronological order with the dazzling post timeline posts. WordPress has several themes that have default horizontal timeline formats. But, to get a fully functional & beautifully designed timeline WordPress has plenty of resources of timeline plugins.

No concerns! We have assembled the best post timeline WordPress plugins. Each set of plugins have different functionalities and customization settings. Get the best one and create a timeline with the best one!

1. WP Timeline Designer Pro

WP Timeline Designer is a feature-rich plugin that provides vertical and horizontal timeline templates with lots of advanced functionalities. While showcasing a story or company history with the beautiful chart or design then timeline layout helps to easily understand and attract the readers as well. A great way to tell a story or create a post then the timeline plugin helps to create an attractive timeline.

Timeline Designer – Free

Timeline Designer – a free plugin recently launched on the WordPress repository platform. The free plugin contains in-built 6 existing customizable layouts with other customization options. Using this WordPress plugin, a user can match the look & feel of your WordPress site.

Features:

  • Supports custom post type.
  • Provides the customization of background color, show/hide timeline icon, template layout color, and basic animations.
  • Style the post with the stunning content box.
  • With the Horizontal timeline layout, a user gets the navigation option such as auto slide, number of slides, scrolling speed, etc.
  • The plugin has Shortcode functionality with which a user can showcase timeline posts anywhere on the website.

WP Timeline Designer Pro – Premium

WP Timeline Designer Pro is an elegant and fantastic plugin with responsive timeline layouts. In the pro version, the plugin contains 15+ timeline templates with lots of options and tools to style and design the posts. It has in-built 20+ core demos available with which a user can showcase life story, event summary, author biography, achievements, company history, hiring process, etc in an eye-catchy timeline design.

Features:

  • 12+ post animation effects on scrolling.
  • Advanced filter post with the date, time period, author, post category, post status, etc.
  • 10+ social sharing icons available and available in the library to change the icon settings anytime.
  • The plugin allows you to add different types of pagination options such as load more buttons, pagination on scroll, etc.
  • The premium plugin contains several media options for timeline posts such as hover effect on images, adjust image size, or text. link on media, custom image size, etc.

2. Post Timeline

Post Timeline plugin allows creating a timeline on 100% of the page. It allows the creation of unlimited vertical and horizontal timelines. To create a simple and single timeline, a user can use shortcode functionality.

**Post Timeline – Free **

The Post Timeline Free plugin allows you to create a timeline on the vertical layout. A user can also assign the category and tags.

Features:

  • Smooth Animation & Slide Navigation is available.
  • The plugin helps to create a tag-based and year-based timeline with parameters.
  • The free plugin has customization offers such as color, assign different icons, etc.

Post Timeline – Premium

The pro version of the Post Timeline WordPress plugin has both vertical and horizontal timeline layouts. The plugin has inbuilt 23 timeline templates and all the timelines layout can be chosen by the admin for each timeline.

Features:

  • The plugin has CSS3 animation + JS animation to make the timeline post prettier.
  • Post Timeline comes with the backend template manager. It allows a user to preview the timeline on the page with the required content.
  • 5 navigation options available.

3. Cool Timeline

Cool Timeline, as its name suggests, creates a complete timeline layout for the WordPress website. It is an HTML and CSS timeline plugin that helps to build awesome horizontal and vertical layouts. The new version of the plugin is very well compatible with Gutenberg.

**Cool Timeline: Free **

The Cool Timeline with the free version has 5 vertical and one horizontal timeline design. Also, the plugin allows users to showcase the stories in ascending & descending orders based on the year and date.

Features:

  • It is a Gutenberg-friendly WordPress plugin with which a user can add shortcodes on any page using the Gutenberg block.
  • A user can showcase the timeline images in the pop-up and link them to read a full story.
  • Using this plugin, you can create a timeline both-sided as well as one-sided.

Cool TimelineCool Timeline: Premium

Cool Timeline Pro plugin has an advanced admin panel that helps to manage the timeline visibility details & other customization factors very smoothly. The premium plugin comes with 4 timeline layouts with 40+ several timeline designs.

Features:

  • It provides a custom text and custom story order in/place of date and time in a timeline layout.
  • Create multiple timelines in one website with the different categories
  • The plugin comes with the proper navigation options, so a user can quickly navigate to a particular story.

#best wordpress timeline plugin #post timeline plugin wordpress #post timeline wordpress #timeline plugin for wordpress #wordpress post timeline plugins #wordpress timeline plugin

Top 7 Post Timeline WordPress Plugins

Want to feature a brand history or storyline on a WordPress website? If yes, then read this blog thoroughly.

Many of your website visitors want to know about your brand history or the achievements of your past. For that, a timeline layout is a good solution. Showcase the story of your company or brand in chronological order with the dazzling post timeline posts. WordPress has several themes that have default horizontal timeline formats. But, to get a fully functional & beautifully designed timeline WordPress has plenty of resources of timeline plugins.

No concerns! We have assembled the best post timeline WordPress plugins. Each set of plugins have different functionalities and customization settings. Get the best one and create a timeline with the best one!

1. WP Timeline Designer Pro

WP Timeline Designer is a feature-rich plugin that provides vertical and horizontal timeline templates with lots of advanced functionalities. While showcasing a story or company history with the beautiful chart or design then timeline layout helps to easily understand and attract the readers as well. A great way to tell a story or create a post then the timeline plugin helps to create an attractive timeline.

Timeline Designer – Free

Timeline Designer – a free plugin recently launched on the WordPress repository platform. The free plugin contains in-built 6 existing customizable layouts with other customization options. Using this WordPress plugin, a user can match the look & feel of your WordPress site.
This is image title

Features:

  • Supports custom post type.
  • Provides the customization of background color, show/hide timeline icon, template layout color, and basic animations.
  • Style the post with the stunning content box.
  • With the Horizontal timeline layout, a user gets the navigation option such as auto slide, number of slides, scrolling speed, etc.
  • The plugin has Shortcode functionality with which a user can showcase timeline posts anywhere on the website.

WP Timeline Designer Pro – Premium

WP Timeline Designer Pro is an elegant and fantastic plugin with responsive timeline layouts. In the pro version, the plugin contains 15+ timeline templates with lots of options and tools to style and design the posts. It has in-built 20+ core demos available with which a user can showcase life story, event summary, author biography, achievements, company history, hiring process, etc in an eye-catchy timeline design.
This is image title

Features:

  • 12+ post animation effects on scrolling.
  • Advanced filter post with the date, time period, author, post category, post status, etc.
  • 10+ social sharing icons available and available in the library to change the icon settings anytime.
  • The plugin allows you to add different types of pagination options such as load more buttons, pagination on scroll, etc.
  • The premium plugin contains several media options for timeline posts such as hover effect on images, adjust image size, or text. link on media, custom image size, etc.

2. Post Timeline

Post Timeline plugin allows creating a timeline on 100% of the page. It allows the creation of unlimited vertical and horizontal timelines. To create a simple and single timeline, a user can use shortcode functionality.

**Post Timeline – Free **

The Post Timeline Free plugin allows you to create a timeline on the vertical layout. A user can also assign the category and tags.

Features:

  • Smooth Animation & Slide Navigation is available.
  • The plugin helps to create a tag-based and year-based timeline with parameters.
  • The free plugin has customization offers such as color, assign different icons, etc.
    This is image title

Post Timeline – Premium

The pro version of the Post Timeline WordPress plugin has both vertical and horizontal timeline layouts. The plugin has inbuilt 23 timeline templates and all the timelines layout can be chosen by the admin for each timeline.

Features:

  • The plugin has CSS3 animation + JS animation to make the timeline post prettier.
  • Post Timeline comes with the backend template manager. It allows a user to preview the timeline on the page with the required content.
  • 5 navigation options available.

3. Cool Timeline

Cool Timeline, as its name suggests, creates a complete timeline layout for the WordPress website. It is an HTML and CSS timeline plugin that helps to build awesome horizontal and vertical layouts. The new version of the plugin is very well compatible with Gutenberg.

**Cool Timeline: Free **

The Cool Timeline with the free version has 5 vertical and one horizontal timeline design. Also, the plugin allows users to showcase the stories in ascending & descending orders based on the year and date.

Features:

  • It is a Gutenberg-friendly WordPress plugin with which a user can add shortcodes on any page using the Gutenberg block.
  • A user can showcase the timeline images in the pop-up and link them to read a full story.
  • Using this plugin, you can create a timeline both-sided as well as one-sided.
    This is image title

Cool TimelineCool Timeline: Premium

Cool Timeline Pro plugin has an advanced admin panel that helps to manage the timeline visibility details & other customization factors very smoothly. The premium plugin comes with 4 timeline layouts with 40+ several timeline designs.

Features:

  • It provides a custom text and custom story order in/place of date and time in a timeline layout.
  • Create multiple timelines in one website with the different categories
  • The plugin comes with the proper navigation options, so a user can quickly navigate to a particular story.

#best wordpress timeline plugin #post timeline plugin wordpress #post timeline wordpress #timeline plugin for wordpress #wordpress post timeline plugins #wordpress timeline plugin