[人工智能]day1:图像，视频的打开和保存

头文件：rewiew2.hpp

#pragma once
#include<opencv2/opencv.hpp>
using namespace cv;
using namespace std;
class visionagin
{
public:
	int Readdemo(string& str);
	void Readvideo(string& str);

};

类实现：

#include"review2.h"
int visionagin::Readdemo(string & str)
{
		Mat temp=imread(str);
		if (temp.empty())
		{
			std::cout << "can not open this picture !" << std::endl;
			return -1;
		}
		namedWindow("the picture you wanted ", WINDOW_NORMAL);
		imshow("the picture you wanted ", temp);
		int c = waitKey(0);
	
}
void visionagin::Readvideo(string& str)
{
	VideoCapture cap(str);//创建视频流，打开摄像头0：（0）
	if (!cap.isOpened())
	{
		std::cout << "流打开失败" << std::endl;
	}
	VideoWriter writer;
	Mat temp;
	int code = cap.get(CAP_PROP_FOURCC);
	int width = cap.get(CAP_PROP_FRAME_WIDTH);
	int height = cap.get(CAP_PROP_FRAME_HEIGHT);
	int count = cap.get(CAP_PROP_FRAME_COUNT);
	int fps = cap.get(CAP_PROP_FPS);
	writer.open("C:\\Users\\86176\\Downloads\\visionimage\\walk2.avi", code, fps, Size(width, height), true);//创建保存视频流  尺寸与原视频一致
	if (!writer.isOpened())
	{
		std::cout << "保存流打开失败" << std::endl;
	}
	while (1)
	{
		cap.read(temp);
		if (temp.empty())
		{
			break;
		}
		imshow("video", temp);
		writer.write(temp);//保存
		int c = waitKey(1000/fps);
		if (27 == c)
		{
			break;
		}
	}
	waitKey();//让视频停止在最后一帧，不闪退
	cap.release();//释放
}

main.cpp:

#include"review2.h"
int main()
{
	visionagin qd;
	string dir_name("C:\\Users\\86176\\Downloads\\visionimage\\image.JPEG");
	//qd.Readdemo(dir_name);
	string vid_name("C:\\Users\\86176\\Downloads\\visionimage\\walk.avi");
	qd.Readvideo(vid_name);
    return 0;
}