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像素重映射。
#include <opencv2/opencv.hpp>
#include <iostream>
#include <math.h>using namespace std;
using namespace cv;Mat src, dst, map_x, map_y;
int index_num = 3;
void my_map();
int main(){src = imread("/Users/ming/Documents/test.jpg");if (!src.data){cout << "cannot load image..." << endl;return -1;}imshow("src img", src);int c;while (true) {c = waitKey(200);if ((char)c == 27){ //esc keybreak;}index_num = c % 4; // c=0,1,2,3map_x.create(src.size(), CV_32FC1);map_y.create(src.size(), CV_32FC1);my_map(); //mapremap(src, dst, map_x, map_y, INTER_LINEAR, BORDER_CONSTANT, Scalar(0,255,0));imshow("after map", dst);}return 0;
}void my_map() {/* creat a map */for(int i=0; i<src.rows; i++){for (int j=0; j<src.cols; j++){switch (index_num) {case 0:if ((i >= src.rows * 0.25) && (i < src.rows * 0.75) && (j >= src.cols * 0.25) && (j < src.cols * 0.75)) {map_y.at<float>(i, j) = 2*(i - (src.rows*0.25));map_x.at<float>(i, j) = 2*(j - (src.cols*0.25));}else{map_x.at<float>(i, j) = 0;map_y.at<float>(i, j) = 0;}break;case 1:map_x.at<float>(i, j) = src.cols - j - 1; //左右镜像map_y.at<float>(i, j) = i;break;case 2:map_x.at<float>(i, j) = j;map_y.at<float>(i, j) = src.rows - i -1; //上下镜像break;case 3:map_x.at<float>(i, j) = src.cols - j - 1; //左右上下镜像map_y.at<float>(i, j) = src.rows - i -1;break;default:break;}}}
}
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