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Image effect display (top)

2022-08-07 13:11:00 【deal with】

Foreword

Prepare to update a new series in November. I read Mr. Yang Shuying's "Digital Image Processing Visual Studio C++ Technology Implementation" before.The series transplants all routines to opencv-C++ implementation, that is, the algorithm logic is implemented in C++, and the image object uses the image class that comes with opencv.

This book has supporting tutorials at station B. It is an open class taught by Ms. Yang Shuying from Tianjin University of Technology. Just search it directly.

So this series does not explain the principle in detail, only the basic idea + code + operation effect, the detailed principle can be read in the book, I will not repeat the content of the book.

Image scanning display

Scan down is to block the image and display it in time.

The scanning effect can be achieved by continuously changing the displayed ROI area: 

void scanning_down(){// read imageMat srcImage, dstImage;srcImage = imread("2.jpg");imshow("Original Image", srcImage);//define variableMat roiImage;int ImageHeigth = srcImage.rows;int ImageWidth = srcImage.cols;namedWindow("scan down");for (int i = 1; i < ImageHeigth; i++) {//step size is 1roiImage = srcImage(Rect(0, 0, ImageWidth, i));roiImage.copyTo(dstImage);imshow("Scan down", dstImage);waitKey(5);}waitKey(0);}

Animation

Up, left, right scan display the same.

The image fades in

The idea of ​​image fading is to first record the pixel value of each pixel of the image, turn the screen black first, and display the image n times in a loop, where n is 0, 1, 2, ..., 256.Each time the pixel value is displayed n/256 times, so as to achieve the effect of fading.

void fade_in()//fade in{// read imageMat srcImage, dstImage;srcImage = imread("2.jpg");dstImage = srcImage.clone();imshow("Original Image", srcImage);//define variableMat roiImage;int ImageHeigth = srcImage.rows;int ImageWidth = srcImage.cols * 3;namedWindow("image fade in");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("image fade in", dstImage);waitKey(10);}}

Animation

Mosaic display

Mosaic display is to divide the picture into small blocks of fixed size, and record the coordinates of the upper left corner of all small blocks, and then randomly display these small blocks, which is the mosaic effect.

//image mosaic displayvoid mosaic(){// read imageMat srcImage, dstImage;srcImage = imread("2.jpg");dstImage = Mat(srcImage.size(), CV_8UC3);imshow("Original Image", srcImage);//define variableMat roiImage;int ImageHeigth = srcImage.rows;int ImageWidth = srcImage.cols;namedWindow("image mosaic display");//Store the first address of each small block and shuffle it randomlyint step =24;//Define the side length of the mosaic (square)vector temp;unsigned int mi = 0;//for loop to store all node coordinatesfor (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(x,y));mi++;}}random_shuffle(temp.begin(), temp.end());//Shuffle the elements in the container//for loop to display each random mosaicfor (int i = 0; i < mi; i++) {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);}

Animation

THE END

That's it for today.Tomorrow, I will update the image display effects of image panning, cross fly-in, middle expansion, grid effect, and blind effect.

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