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This article introduces the relevant knowledge of "how to achieve image special effects display on C++". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Image scanning display

To scan down is to divide the image into blocks and delay display.

The scanning effect can be achieved by constantly changing the displayed roi area:

Void scanning_down () {/ / read the picture Mat srcImage, dstImage; srcImage = imread ("2.jpg"); imshow ("original image", srcImage); / / define the variable Mat roiImage; int ImageHeigth = srcImage.rows; int ImageWidth = srcImage.cols; namedWindow ("scan down"); for (int I = 1; I

< ImageHeigth; i++) {//步长为1 roiImage = srcImage(Rect(0, 0, ImageWidth, i)); roiImage.copyTo(dstImage); imshow("向下扫描", dstImage); waitKey(5); } waitKey(0);} 动图 向上，向左，向右扫描显示同理。 图像渐显 图像渐显思路是先记录下图像每个像素点的像素值，显示的时候先将屏幕置黑，将循环显示图像n次，n依次为0，1，2，...，256。每一次显示像素值的n/256倍，从而达到渐显的效果。 void fade_in()//淡入{ //读取图片 Mat srcImage, dstImage; srcImage = imread("2.jpg"); dstImage = srcImage.clone(); imshow("原图", srcImage); //定义变量 Mat roiImage; int ImageHeigth = srcImage.rows; int ImageWidth = srcImage.cols * 3; namedWindow("图像渐显"); for (int n = 1; n < 256; n++) { for (int i = 0; i < ImageHeigth; i++) { uchar* data1 = srcImage.ptr(i); uchar* data2 = dstImage.ptr(i); for (int j = 0; j < ImageWidth; j++) { data2[j] = data1[j] * n / 256; } } imshow("图像渐显", dstImage); waitKey(10); }} 动图 马赛克显示 马赛克显示是将图片分为固定大小的小块，并记录下所有小块的左上角坐标，然后随机将这些小块显示出来，就是马赛克效果。 //图像马赛克显示void mosaic() { //读取图片 Mat srcImage, dstImage; srcImage = imread("2.jpg"); dstImage = Mat(srcImage.size(), CV_8UC3); imshow("原图", srcImage); //定义变量 Mat roiImage; int ImageHeigth = srcImage.rows; int ImageWidth = srcImage.cols; namedWindow("图像马赛克显示"); //存储每个小块的首地址并随机打乱 int step =24;//定义马赛克边长（正方形） vector temp; unsigned int mi = 0; //for循环存储所有节点坐标 for (int x = 0; x < ImageWidth; x = x + step) { for (int y = 0; y < ImageHeigth; y = y + step) { if (x >

ImageWidth-step) {x = ImageWidth-step;} if (y > ImageHeigth-step) {y = ImageHeigth-step;} temp.push_back (Point2d (xMagy)); mi++;}} random_shuffle (temp.begin (), temp.end ()); / / disrupt the elements in the container / / for loop shows each random mosaic for (int I = 0; I < mi) ItemPlus) {srcImage (Rect (temp [I] .x, temp [I] .y, step, step)) .copyTo (dstImage (Rect (temp [I] .x, temp [I] .y, step, step)); imshow ("Image mosaic display", dstImage); waitKey (1);} waitKey (0);}

Moving picture

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