PHP and OpenCV libraries: How to do image blur recovery?

PHP and OpenCV library: How to do image blur recovery?

Introduction:
In the field of image processing, image blur is a common problem. When we process images captured by a camera, blurry images sometimes occur, for example due to hand shake or rapid movement. This article will introduce how to use PHP and OpenCV libraries to restore blurred images.

1. Install the OpenCV library
   First, we need to install the OpenCV library in the PHP environment. OpenCV (Open Source Computer Vision Library) is an open source computer vision library that provides a wealth of image processing functions and algorithms. Execute the following command in the terminal to install the OpenCV library:

sudo apt-get install php7.4-opencv

2. Load image
   Before we start, we need to have a blurred image for recovery. First, place the blurred image in the same directory as the PHP script and execute the following code to load the image into the program:

$blurryImage = cvimread('blurry_image.jpg');

3. Image Recovery
   The OpenCV library provides many A filter function that can be used for image restoration. In this example, we will use the mean filter for image restoration. The mean filter is a simple linear filter that replaces the value of each pixel with the average of surrounding pixels. The following is the sample code for the mean filter:

$restoredImage = cvlur($blurryImage, new cvSize(3, 3));

In the above code, the cv lur function takes the input image and filter size as parameters and returns a restored image .

4. Display image
   Finally, we can use the following code to display the recovered image on the web page:

header('Content-Type: image/jpeg');
cvimwrite('restored_image.jpg', $restoredImage);
echo file_get_contents('restored_image.jpg');

In the above code, we first set The Content-Type of the HTTP header is image/jpeg so that the browser can correctly parse the image. Then, save the restored image as restored_image.jpg, and output the image content to the page through the file_get_contents function.

5. Conclusion
   By using PHP and OpenCV libraries, we can easily restore blurred images. Using the filter function provided by OpenCV, we can choose a filter suitable for specific needs to restore the image. In this article, we used the mean filter for image restoration, but there are other filters you can try.

By using the OpenCV library, PHP developers can exert more powerful capabilities in the field of image processing while improving image quality and user experience.

Reference code: https://github.com/opencv-php/opencv-python-tutorial

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