OpenCV_11高反差保留

一，原图：

二，代码：

//11高反差保留
int R = 5;
void HighContrastRetention()
{
	Mat src = imread("D:\\test\\26.png");
	int width = src.cols;
	int heigh = src.rows;
	Mat img;
	src.copyTo(img);
	Mat avg;
	//GaussianBlur(img,avg,Size(R,R),0.0);
	blur(img, avg, Size(R, R));
	Mat dst(img.size(), CV_8UC3);
	float tmp;
	for (int y = 0; y<heigh; y++)
	{
		uchar* imgP = img.ptr<uchar>(y);
		uchar* avgP = avg.ptr<uchar>(y);
		uchar* dstP = dst.ptr<uchar>(y);
		for (int x = 0; x<width; x++)
		{
			float r0 = abs((float)imgP[3 * x] - (float)avgP[3 * x]) / 128;
			tmp = abs(((float)imgP[3 * x])*r0 + 128 * (1 - r0));
			tmp = tmp>255 ? 255 : tmp;
			tmp = tmp<0 ? 0 : tmp;
			dstP[3 * x] = (uchar)(tmp);

			float r1 = abs((float)imgP[3 * x + 1] - (float)avgP[3 * x + 1]) / 128;
			tmp = (uchar)abs(((float)imgP[3 * x + 1])*r1 + 128 * (1 - r1));
			tmp = tmp>255 ? 255 : tmp;
			tmp = tmp<0 ? 0 : tmp;
			dstP[3 * x + 1] = (uchar)(tmp);

			float r2 = abs((float)imgP[3 * x + 2] - (float)avgP[3 * x + 2]) / 128;
			tmp = (uchar)abs(((float)imgP[3 * x + 2])*r2 + 128 * (1 - r2));
			tmp = tmp>255 ? 255 : tmp;
			tmp = tmp<0 ? 0 : tmp;
			dstP[3 * x + 2] = (uchar)(tmp);
		}
	}
	imshow("high", dst);

	//高通滤波测试

	Mat kern = (Mat_<char>(3, 3) << -1, -1, -1,
		-1, 5, -1,
		-1, -1, -1);
	Mat dstF;
	filter2D(img, dstF, img.depth(), kern);
	imshow("kernel", dstF);

	waitKey();
	imwrite("D:/高反差保留.jpg", dst);
	imwrite("D:/高通滤波.jpg", dstF);
}

//-----开始------
void COpenCVLearningDlg::OnBnClickedStartButton()
{
	HighContrastRetention();
}

三，结果：

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原文地址：https://blog.csdn.net/sangni007/column/info/stylizefliter