代码示例:
#include <opencv2/opencv.hpp>
#include <iostream>
#include <math.h>
using namespace cv;
int main(int argc, char** argv) {
Mat src, dst;
src = imread("D:/vcprojects/images/test.png");
if (!src.data) {
printf("could not load image...\n");
return -1;
}
char INPUT_TITLE[] = "input image";
char OUTPUT_TITLE[] = "sobel-demo";
namedWindow(INPUT_TITLE, CV_WINDOW_AUTOSIZE);
namedWindow(OUTPUT_TITLE, CV_WINDOW_AUTOSIZE);
imshow(INPUT_TITLE, src);
Mat gray_src;
GaussianBlur(src, dst, Size(3, 3), 0, 0); //先去噪
cvtColor(dst, gray_src, CV_BGR2GRAY); //灰度化
imshow("gray image", gray_src);
Mat xgrad, ygrad;
Scharr(gray_src, xgrad, CV_16S, 1, 0);
Scharr(gray_src, ygrad, CV_16S, 0, 1);
// Sobel(gray_src, xgrad, CV_16S, 1, 0, 3); //x方向1,y方向0,x方向求导
// Sobel(gray_src, ygrad, CV_16S, 0, 1, 3);//x方向0,y方向1,y方向求导
convertScaleAbs(xgrad, xgrad);
convertScaleAbs(ygrad, ygrad);
imshow("xgrad", xgrad);
imshow("ygrad", ygrad);
Mat xygrad = Mat(xgrad.size(), xgrad.type());
//x.y方向求导后图像混合
int width = xgrad.cols;
int height = ygrad.rows;
for (int row = 0; row < height; row++) {
for (int col = 0; col < width; col++) {
int xg = xgrad.at<uchar>(row, col);
int yg = ygrad.at<uchar>(row, col);
int xy = xg + yg;
xygrad.at<uchar>(row, col) = saturate_cast<uchar>(xy);
}
}
//addWeighted(xgrad, 0.5, ygrad, 0.5, 0, xygrad); //x.y方向求导后图像混合
imshow(OUTPUT_TITLE, xygrad);
waitKey(0);
return 0;
}
原图
灰度图
x.y方向求导
x.y方向求导后图像混合
使用Scharr效果