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  • 图像映射

    #include <opencv2/opencv.hpp>
    #include <iostream>
    #include <math.h>
    
    using namespace cv;
    Mat src, dst, map_x, map_y;
    const char* OUTPUT_TITLE = "remap demo";
    int index = 0;
    void update_map(void);
    int main(int argc, char** argv) {
        src = imread(".//pic//kate.png");
        if (!src.data) {
            printf("can not load image...
    ");
            return -1;
        }
        char input_win[] = "input image";
        namedWindow(input_win, CV_WINDOW_AUTOSIZE);
        namedWindow(OUTPUT_TITLE, CV_WINDOW_AUTOSIZE);
        imshow(input_win, src);
    
        map_x.create(src.size(), CV_32FC1);
        map_y.create(src.size(), CV_32FC1);
    
        int c = 0;
        while (true) {
            c = waitKey(500);
            if ((char)c == 27) {
                break;
            }
            index = c % 4;
            update_map();
            //map_x,是x的映射关系
            //map_y,是y的映射关系
            remap(src, dst, map_x, map_y, INTER_LINEAR, BORDER_CONSTANT, Scalar(0, 255, 255));
            imshow(OUTPUT_TITLE, dst);
        }
    
        return 0;
    }
    
    void update_map(void) {
        for (int row = 0; row < src.rows; row++) {
            for (int col = 0; col < src.cols; col++) {
                switch (index) {
                case 0:
                    //图像缩放到四分之一处
                    if (col > (src.cols * 0.25) && col <= (src.cols * 0.75) && row > (src.rows * 0.25) && row <= (src.rows * 0.75))
                    {
                        //src.cols * 0.25相当于减去左边的长度,乘以二是以2进行采样
                        map_x.at<float>(row, col) = 2 * (col - (src.cols * 0.25));
                        map_y.at<float>(row, col) = 2 * (row - (src.rows * 0.25));
                    }
                    else 
                    {
                        map_x.at<float>(row, col) = 0;
                        map_y.at<float>(row, col) = 0;
                    }
                    break;
                case 1:
                    //左右互换
                    map_x.at<float>(row, col) = (src.cols - col - 1);
                    map_y.at<float>(row, col) = row;
                    break;
                case 2:
                    //上下互换
                    map_x.at<float>(row, col) = col;
                    map_y.at<float>(row, col) = (src.rows - row - 1);
                    break;
                case 3:
                    //左右,上下互换
                    map_x.at<float>(row, col) = (src.cols - col - 1);
                    map_y.at<float>(row, col) = (src.rows - row - 1);
                    break;
                }
    
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/xiaochi/p/12030135.html
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