一，原图：

二，代码：

//13羽化
float mSize = 0.5;

void Feathering()
{
	Mat src = imread("D:\\test\\lena.jpg");
	imshow("src", src);
	int width = src.cols;
	int heigh = src.rows;
	int centerX = width >> 1;
	int centerY = heigh >> 1;

	int maxV = centerX*centerX + centerY*centerY;
	int minV = (int)(maxV*(1 - mSize));
	int diff = maxV - minV;
	float ratio = width >heigh ? (float)heigh / (float)width : (float)width / (float)heigh;

	Mat img;
	src.copyTo(img);

	Scalar avg = mean(src);
	Mat dst(img.size(), CV_8UC3);
	Mat mask1u[3];
	float tmp, r;
	for (int y = 0; y<heigh; y++)
	{
		uchar* imgP = img.ptr<uchar>(y);
		uchar* dstP = dst.ptr<uchar>(y);
		for (int x = 0; x<width; x++)
		{
			int b = imgP[3 * x];
			int g = imgP[3 * x + 1];
			int r = imgP[3 * x + 2];

			float dx = centerX - x;
			float dy = centerY - y;

			if (width > heigh)
				dx = (dx*ratio);
			else
				dy = (dy*ratio);

			int dstSq = dx*dx + dy*dy;

			float v = ((float)dstSq / diff) * 255;

			r = (int)(r + v);
			g = (int)(g + v);
			b = (int)(b + v);
			r = (r>255 ? 255 : (r<0 ? 0 : r));
			g = (g>255 ? 255 : (g<0 ? 0 : g));
			b = (b>255 ? 255 : (b<0 ? 0 : b));

			dstP[3 * x] = (uchar)b;
			dstP[3 * x + 1] = (uchar)g;
			dstP[3 * x + 2] = (uchar)r;
		}
	}
	imshow("羽化", dst);

	waitKey();
	imwrite("D://羽化.jpg", dst);

}


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

三，结果：

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