How to convert image color space using PHP and OpenCV libraries

Method for image color space conversion using PHP and OpenCV libraries

With the continuous development of computer image processing, image color space conversion has also become an important task. In many image processing applications, images need to be converted from one color space to another for subsequent processing or analysis. In this article, I will introduce how to use PHP and OpenCV libraries to implement image color space conversion.

First, make sure your system has PHP and OpenCV libraries installed. If it is not installed, you can install it through the following command:

sudo apt-get install php sudo apt-get install php-dev sudo apt-get install php-pear sudo pecl install opencv

After the installation is complete, we can start writing PHP code. First, create a file namedcolor_convert.phpand add the following code in the file:

In the above code, we first loaded the OpenCV library and created aMatobject to load the input image, the file name isinput.jpg. Then, use thecvtColorfunction to convert the image from BGR color space to grayscale color space, and save the converted image asoutput.jpg. Finally, a message that the conversion is complete is output.

Before executing the above code, make sure that the fileinput.jpgexists in the directory and has permission to read and write.

Next, run the following command in the command line to execute the PHP script:

php color_convert.php

After execution, you will see a file namedoutput.jpg# in the same directory ## file, this is the converted image.

https://docs.opencv.org/master/d8/d01/group__imgproc__color__conversions.html

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