opencv Sobel算子提取圖形中的輪廓

原創

2020-06-28 15:21

話不多說先上結果圖：

上代碼：

// opencv0018.cpp : 定義控制檯應用程序的入口點。
//

#include "stdafx.h"
#include <opencv2/opencv.hpp>
#include <iostream>

using namespace std;
using namespace cv;

int main()
{
	Mat src, dst;
	src = imread("D:/images/pkq.jpg"); //加載圖像
	if (src.empty())
	{
		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);
	cvtColor(dst, gray_src, CV_BGR2GRAY);
	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);
	Sobel(gray_src, ygrad, CV_16S, 0, 1, 3);

	convertScaleAbs(xgrad, xgrad);
	convertScaleAbs(ygrad, ygrad);

	imshow("xgrad", xgrad);
	imshow("ygrad", ygrad);

	Mat xygrad = Mat(xgrad.size(), xgrad.type());
	addWeighted(xgrad, 0.5, ygrad, 0.5, 0, xygrad);
	imshow(OUTPUT_TITLE, xygrad);
	waitKey(0);

    return 0;
}