opencv

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读取图片

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Mat src = imread("E:/vs2019/code/opencv/images/A.jpg");
//加载灰度图形
Mat img = imread("E:/vs2019/code/opencv/images/A.jpg", IMREAD_GRAYSCALE);
//加载有透明通道的图像
Mat img2 = imread("E:/vs2019/code/opencv/images/A.jpg",IMREAD_UNCHANGED);

显示图片

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imshow("input", src);
//当图片很大时，图像会显示不全，并且图片窗口无法控制大小
//这时候就需要在imshow之前加一个函数
namedWindow("图片", WINDOW_FREERATIO);

代码

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#include<iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>


using namespace cv;
using namespace std;

int main()
{
	Mat img = imread("E:/vs2019/code/opencv/images/A.jpg", IMREAD_GRAYSCALE);
	if (img.empty()) {
		cout << "could not load image ..." << endl;
		return -1;
	}
	//namedWindow("图片", WINDOW_FREERATIO);
	imshow("图片", img);
	waitKey(60000);
}

色彩空间转换

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#include <quickopencv.h>

void QuickDemo::colorSpace_Demo(Mat &image) {
	Mat gray, hsv;
	cvtColor(image, hsv, COLOR_BGR2HSV);
	cvtColor(image, gray, COLOR_BGR2GRAY);
	imshow("HSV", hsv);
	imshow("灰度", gray);
	imwrite("E:/vs2019/code/opencv/images/Ahsv.jpg", hsv);
	imwrite("E:/vs2019/code/opencv/images/Agray.jpg", gray);
}

图像保存