OpenCV-PS diffusion hairy glass effect implementation code

Implementation Principle

PS diffusion effect can produce a similar effect of hairy glass texture, so that the picture is somewhat hairy. Its implementation can be achieved by manipulating the pixel three-channel numerical value, define a random number device, the value of any point in the image is assigned to the value of the point as the center of a certain size of the window (such as 3 * 3,5 * 5) within a random point of value.

Function Code

// Diffusion effect
cv::Mat Diffusion(cv::Mat src,int size)
{
	int row = ;
	int col = ;
	RNG rng;
	cv::Mat result = ();
	for (int i = size; i < row- size; ++i)
	{
		uchar* t = <uchar>(i);
		for (int j = size; j < col- size; ++j)
		{
			int tmp = (0, 2*size+1);
			t[3 * j] = <uchar>(i - size + tmp / (2 * size + 1), 3 * (j - size + tmp % (2 * size + 1)));
			t[3 * j + 1] = <uchar>(i - size + tmp / (2 * size + 1), 3 * (j - size + tmp % (2 * size + 1)) + 1);
			t[3 * j + 2] = <uchar>(i - size + tmp / (2 * size + 1), 3 * (j - size + tmp % (2 * size + 1)) + 2);
		}
	}
	return result;
}

C++ Test Code

#include <iostream>
#include <string>
#include <opencv2/>
 
using namespace std;
using namespace cv;
 
cv::Mat Diffusion(cv::Mat src, int size);
 
int main()
{
	cv::Mat src = imread("");
	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 = ;
	int col = ;
	RNG rng;
	cv::Mat result = ();
	for (int i = size; i < row- size; ++i)
	{
		uchar* t = <uchar>(i);
		for (int j = size; j < col- size; ++j)
		{
			int tmp = (0, 2*size+1);
			t[3 * j] = <uchar>(i - size + tmp / (2 * size + 1), 3 * (j - size + tmp % (2 * size + 1)));
			t[3 * j + 1] = <uchar>(i - size + tmp / (2 * size + 1), 3 * (j - size + tmp % (2 * size + 1)) + 1);
			t[3 * j + 2] = <uchar>(i - size + tmp / (2 * size + 1), 3 * (j - size + tmp % (2 * size + 1)) + 2);
		}
	}
	return result;
}

test effect

Figure 1 Original diagram

Figure 2 5*5 diffusion

Figure 3 11*11 diffusion

Adjusting the SIZE appropriately can change the intensity of the diffusion, which in turn brings out a different texture.

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