【OpenCV学习笔记】十九、图像边缘检测

图像边缘检测

Canny边缘检测——Canny()

Sobel边缘检测——Sobel()

Laplacian边缘检测——Laplacian()

先上ppt：

代码：

#include "opencv2/opencv.hpp"

using namespace cv;

void main()
{
	///Canny边缘检测
	/*Mat srcImg = imread("1.bmp", CV_LOAD_IMAGE_COLOR);
	imshow("src", srcImg);
	Mat dstImg;
	Canny(srcImg, dstImg, 30, 80);
	imshow("Canny", dstImg);
	waitKey(0);*/

	/Sobel边缘检测
	//Mat grad_x, grad_y;
	//Mat abs_grad_x, abs_grad_y, dst;

	//Mat src = imread("2.png", CV_LOAD_IMAGE_COLOR);
	//imshow("src", src);

	//Sobel(src, grad_x, CV_16S, 1, 0, 3, 1, 1, BORDER_DEFAULT);//因为Sobel求出来的结果有正负，8位无符号表示不全，故用16位有符号表示
	//convertScaleAbs(grad_x, abs_grad_x);//将16位有符号转化为8位无符号
	//imshow("X方向", abs_grad_x);

	//Sobel(src, grad_y, CV_16S, 0, 1, 3, 1, 1, BORDER_DEFAULT);
	//convertScaleAbs(grad_y, abs_grad_y);
	//imshow("Y方向", abs_grad_y);

	//addWeighted(abs_grad_x, 0.5, abs_grad_y, 0.5, 0, dst);
	//imshow("合并效果", dst);

	//waitKey(0);
	//destroyAllWindows();

	///Laplacian边缘检测
	Mat grad_x, grad_y;
	Mat abs_grad_x, abs_grad_y, dst;
	Mat abs_dst;

	Mat src = imread("1.bmp", CV_LOAD_IMAGE_GRAYSCALE);
	imshow("src", src);

	Laplacian(src, dst, CV_16S, 5, 1, 0, BORDER_DEFAULT);
	convertScaleAbs(dst, abs_dst);

	imshow("Laplacian", abs_dst);

	waitKey(0);
	destroyAllWindows();
}

运行结果：

Canny边缘检测:

Sobel边缘检测:

Laplacian边缘检测: