Opencv3——遍历Mat像素值
#include <opencv2/opencv.hpp>
#include <iostream>
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using namespace std;
int main(int artc, char** argv) {
Mat src = imread("D:/test.png");
if (src.empty()) {
printf("could not load image...\n");
return -1;
}
namedWindow("input", CV_WINDOW_AUTOSIZE);
imshow("input", src);
// 直接读取图像像素
int height = src.rows;
int width = src.cols;
int ch = src.channels();
for (int c = 0; c < ch; c++) {
for (int row = 0; row < height; row++) {
for (int col = 0; col < width; col++) {
if (ch == 3) {
Vec3b bgr = src.at<Vec3b>(row, col);
bgr[0] = 255 - bgr[0];
bgr[1] = 255 - bgr[1];
bgr[2] = 255 - bgr[2];
src.at<Vec3b>(row, col) = bgr;
} else if(ch == 1) {
int gray = src.at<uchar>(row, col);
src.at<uchar>(row, col) = 255 - gray;
}
}
}
}
imshow("output", src);
waitKey(0);
return 0;
}
