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This article is about how OpenCV achieves the ground glass effect of PS diffusion. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Realization principle

The diffusion effect of PS can produce a texture similar to ground glass, making the picture feel hairy. It can be realized by manipulating the three-channel values of pixels, defining a random numerator, assigning the value of any point in the image to the value of a random point in a window of a certain size (such as 3-3-5-5).

Function code

/ / Diffusion effect cv::Mat Diffusion (cv::Mat src,int size) {int row = src.rows; int col = src.cols; RNG rng; cv::Mat result = src.clone (); for (int I = size; I < row- size; + + I) {uchar* t = result.ptr (I); for (int j = size; j < col- size) + + j) {int tmp = rng.uniform (0, 2*size+1); t [3 * j] = src.at (I-size+ tmp / (2*size+1), 3 * (j-size+ tmp% (2*size+1) T [3 * j + 1] = src.at (I-size + tmp / (2 * size + 1), 3 * (j-size + tmp% (2 * size + 1) + 1); t [3 * j + 2] = src.at (I-size + tmp / (2 * size + 1), 3 * (j-size + tmp% (2 * size + 1)) + 2) }} return result;}

C++ test code

# include # include # include using namespace std;using namespace cv; cv::Mat Diffusion (cv::Mat src, int size); int main () {cv::Mat src = imread ("test.jpg"); int size = 5; cv::Mat result = Diffusion (src,size); cv::imshow ("original", src); cv::imshow ("result", result); waitKey (0); return 0 } / / Diffusion effect cv::Mat Diffusion (cv::Mat src,int size) {int row = src.rows; int col = src.cols; RNG rng; cv::Mat result = src.clone (); for (int I = size; I < row- size; + + I) {uchar* t = result.ptr (I); for (int j = size J < col- size; + + j) {int tmp = rng.uniform (0, 2*size+1); t [3 * j] = src.at (I-size+ tmp / (2*size+1), 3 * (j-size+ tmp% (2*size+1) T [3 * j + 1] = src.at (I-size + tmp / (2 * size + 1), 3 * (j-size + tmp% (2 * size + 1) + 1); t [3 * j + 2] = src.at (I-size + tmp / (2 * size + 1), 3 * (j-size + tmp% (2 * size + 1)) + 2) }} return result;}

Test effect

Fig. 1 original picture

Fig. 2 5 Diffusion

Fig. 3 11-11 diffusion

Proper adjustment of size can change the intensity of diffusion and bring different texture.

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