OpenCV——摄像头学习,带截图功能

1、仅调用摄像头

#include 
#include 
#include 

using namespace std;
using namespace cv;

int main(int argc, char** argv)
{
    Mat frame;
    VideoCapture capture(0);
    namedWindow("My_Camera");
    while(1)
    {
        if(capture.isOpened())
        {
            capture>>frame;
            imshow("My_Camera",frame);
            char c=waitKey(30);
            if(c==27)
                break;
        }
        else
        {
            cout<<"No Camera Input!"<<endl;
            break;
        }
    }
    return 0;
}

2、调用摄像头+空格键截图保存图片

#include
#include
#include
#include

using namespace std;
using namespace cv;

#define camera_name "摄像头"
#define picwindow_name "截图图片"

int main()
{
	VideoCapture capture(0);
	if (!capture.isOpened())
	{
		cout << "摄像头打开失败!" << endl;
		return 0;
	}
	Mat frame;
	char key;//按键
	char picture_name[200];//用于存放保存图片的文件名
	int i = 0;//计数
	namedWindow(camera_name);
	namedWindow(picwindow_name);
	while (1)
	{
		key = waitKey(30);
		capture >> frame;
		imshow(camera_name, frame);
		if (key == 27)
		{
			break;//ESC键退出
		}
		if (key == 32)
		{
			sprintf(picture_name, "C:\\DZH\\pic%d.jpg", i++);
			//sprintf(picture_name, "pic%d.jpg", i++);//若保存在根目录,这样即可
			imwrite(picture_name, frame);
			imshow(picwindow_name, frame);
		}
	}
	return 0;
}