opencv学习-Harris角点检测

Posted 2021-08-11 殇堼

一、理论

二、API

三、部分代码-无滑动条

3.1部分代码

#include<opencv2/opencv.hpp>
#include<iostream>

using namespace cv;
using namespace std;

int main()
{
	Mat src, gray_src, dst, norm_dst;
	src = imread("D:/images/lena.png");
	if (src.empty())
	{
		cout << "图片为空" << endl;
		return -1;
	}
	imshow("input title", src);

	cvtColor(src, gray_src, COLOR_BGR2GRAY);

	int thres_value = 130;
	dst = Mat::zeros(gray_src.size(), CV_32FC1);
	cornerHarris(gray_src, dst, 2, 3, 0.04, BORDER_DEFAULT);
	normalize(dst, norm_dst, 0, 255, NORM_MINMAX, CV_32FC1, Mat());
	convertScaleAbs(norm_dst, norm_dst);
	Mat resultImg = src.clone();

	for (int row = 0; row < resultImg.rows; row++)
	{
		uchar* currentRow = norm_dst.ptr(row);
		for (int col = 0; col < resultImg.cols; col++)
		{
			int value = (int)*currentRow;

			if (value > thres_value)
			{
				circle(resultImg, Point(col, row), 2, Scalar(0, 0, 255), 2, 8, 0);
			}
			currentRow++;
		}
	}
	imshow("outputTitle", resultImg);

	waitKey(0);
	return 0;
}

3.2效果展示

四、全部代码-有滑动条

4.1全部代码

#include<opencv2/opencv.hpp>
#include<iostream>

using namespace cv;
using namespace std;

int thres_value = 130;
Mat src, gray_src, dst, norm_dst;

void Harris_demo(int, void *)
{
	dst = Mat::zeros(gray_src.size(), CV_32FC1);
	cornerHarris(gray_src, dst, 2, 3, 0.04, BORDER_DEFAULT);
	normalize(dst, norm_dst, 0, 255, NORM_MINMAX, CV_32FC1, Mat());
	convertScaleAbs(norm_dst, norm_dst);
	Mat resultImg = src.clone();

	for (int row = 0; row < resultImg.rows; row++)
	{
		uchar* currentRow = norm_dst.ptr(row);
		for (int col = 0; col < resultImg.cols; col++)
		{
			int value = (int)*currentRow;

			if (value > thres_value)
			{
				circle(resultImg, Point(col, row), 2, Scalar(0, 0, 255), 2, 8, 0);
			}
			currentRow++;
		}
	}
	imshow("outputTitle", resultImg);
}

int main()
{
	src = imread("D:/images/lena.png");
	if (src.empty())
	{
		cout << "图片为空" << endl;
		return -1;
	}
	imshow("input title", src);
	cvtColor(src, gray_src, COLOR_BGR2GRAY);
	Harris_demo(0, 0);
	createTrackbar("Harris", "outputTitle", &thres_value, 255, Harris_demo);

	waitKey(0);
	return 0;
}

4.3效果展示