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Code For Face Detection




1) Source code for face detection in C

The face detection algorithm described in this section is based on the work of Viola and Jones and uses an image pyramid and the Haar wavelet transform. We have used LBP (Local Binary Pattern) in our implementation which is more robust to texture changes. The face detection code is written in C++ and requires OpenCV.

We start with loading the image. We then convert the image to grayscale and apply histogram equalization to it. We then create a Haar cascade classifier object which will be used for face detection. The cascade object is created by loading the pre-trained cascade classifier file. We then use the cascade object to detect faces in the image. The faces are returned as a list of rectangles. We then draw these rectangles on the original image and display it.

2) How the code works

In this section, we will take a look at how the code works. The code is written in C++ and it uses the OpenCV library.

First, the code loads the input image. Then, it converts the image to grayscale. After that, the code uses the Viola-Jones algorithm to detect faces in the image. The algorithm returns a list of rectangles that enclose the faces in the image.

Finally, the code draws rectangles around the faces and displays the result.

3) What the code can be used for

The code can be used for face detection in C++. It can be used to detect faces in images and videos. The code is based on the Viola Jones method.

4) How to modify the code to suit your needs

Nowadays, face detection has become an important part of our daily lives, whether we are using it for security purposes or for simply unlocking our phones. However, the face detection algorithms that are currently available are not perfect, and they often fail to detect faces in low light or when the face is not looking directly at the camera.

In this blog post, we will be discussing a face detection algorithm that was developed by Viola and Jones in 2001. We will be implementing this algorithm in C++ and will be providing a detailed explanation of how it works. We will also be discussing how to modify the code to suit your needs.

The Viola-Jones algorithm is a cascade of Haar-like features. A Haar-like feature is a set of connected white and black pixels that resemble a Haar wavelet. The algorithm works by scanning an image for these Haar  like features and using them to determine if a face is present in the image.

The first step in implementing the Viola-Jones algorithm is to convert the image to grayscale. The algorithm then applies a series of filters to the image. These filters are used to detect edges, lines, and other features that are characteristic of faces.

Once the filters have been applied, the algorithm looks for patterns in the resulting image. These patterns are then used to determine if a face is present in the image. If a face is present, the algorithm will return the coordinates of the face.

The Viola-Jones algorithm is not perfect, and it will occasionally fail to detect a face. However, it is still the most widely used face detection algorithm.


The code for face detection in C++ is a simple and effective way to detect faces in images. The code uses the Viola-Jones algorithm to detect faces in images. The code is written in C++ and is available for free.

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