Opencv学习笔记 简单铅笔效果卡通马赛克毛玻璃效果

        铅笔画滤镜

        铅笔画滤镜主要是提取出图片中梯度比较高的部分，也就是边缘检测

        卡通画特效

        卡通画特效主要由三部分组成

        1、提取图像中轮廓 => edges

        2、使用bilateral 滤波在保留图像的边缘特征的前提下对图像进行模糊操作 => color

        3、使用轮廓的图像作为mask对模糊的操作进行and操作 bitwise_and(color, color, cartoon, edges)

//铅笔效果 Mat image = Cv2.ImRead(@"C:\Users\Desktop\timg.jpg"); Mat pencilSketchImage = new Mat(); int kernelSize = 3; Mat imageGray = new Mat(); Cv2.CvtColor(image, imageGray, ColorConversionCodes.BGR2GRAY); Mat bluredImage = new Mat(); Cv2.GaussianBlur(imageGray, bluredImage, new OpenCvSharp.Size(kernelSize, kernelSize), 0); Mat laplacian = new Mat(); Cv2.Laplacian(bluredImage, laplacian, MatType.CV_32F, kernelSize); Cv2.Normalize(laplacian, laplacian, 0, 1, NormTypes.MinMax); laplacian = laplacian * 255; laplacian.ConvertTo(laplacian, MatType.CV_8U); Cv2.Threshold(laplacian, pencilSketchImage, 145, 255, ThresholdTypes.Binary); Cv2.ImShow("11", pencilSketchImage); //卡通画 Mat image = Cv2.ImRead(@"C:\Users\Desktop\timg.jpg"); Mat cartoonImage = new Mat(); Mat imageGray = new Mat(); Cv2.CvtColor(image, imageGray, ColorConversionCodes.BGR2GRAY); // 获取图像的边缘 Mat bluredImage=new Mat(), edges = new Mat(); Cv2.GaussianBlur(imageGray, bluredImage, new OpenCvSharp.Size(3, 3), 0); Cv2.AdaptiveThreshold(bluredImage, edges, 255, AdaptiveThresholdTypes.MeanC, ThresholdTypes.Binary, 9, 9); // 使用双边滤波处理图片测颜色 Mat color = new Mat(); Cv2.BilateralFilter(image, color, 0, 5, 5); // 卡通化 Cv2.BitwiseAnd(color, color, cartoonImage, edges); Cv2.ImShow("123", cartoonImage); 原图

 

铅笔画效果 卡通效果

         马赛克效果

Mat mat = new Mat("C:\\Users\\xioamao\\Desktop\\20200922073254.png"); for(int j=0; j<mat.Height; j++) { for (int i = 0; i < mat.Width; i++) { if(j>0 && j==0 && i>0 && i==0) { for (int a=0; a<10; a++) { for (int b = 0; b < 10; b++) { if(j + a<mat.Height && i + b<mat.Width) { Vec3b vec3B = mat.At<Vec3b>(j, i); mat.Set<Vec3b>(j + a, i + b, vec3B); } } } } } } Cv2.ImShow("111", mat);

 

        毛玻璃效果

Mat mat = new Mat("C:\\Users\\xiaomao\\Desktop\\20200922073254.png"); Mat dat = new Mat(mat.Size(), mat.Type()); for (int j=0; j<mat.Height-8; j++) { for (int i = 0; i < mat.Width-8; i++) { int index = (int)(random() * 8); Vec3b vec3B = mat.At<Vec3b>(index + j, index + i); dat.Set<Vec3b>(j, i, vec3B); } } Cv2.ImShow("111", dat); //获取0-1之间的随机数 private double random() { var seed = Guid.NewGuid().GetHashCode(); Random r = new Random(seed); int i = r.Next(0, 100000); return (double)i / 100000; }