opencv 截图并保存

opencv 截图并保存(转载)

代码功能：选择图像中矩形区，按S键截图并保存，Q键退出。

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

using namespace std;
using namespace cv;

Rect select;
bool select_flag = false;
Mat img, showImg;

void S_on_Mouse(int event, int x, int y, int flags, void*param)//画矩形框并截图
{
Point p1, p2;
switch (event)
{
case EVENT_LBUTTONDOWN:
{
select.x = x;
select.y = y;
select_flag = true;
}
break;
case EVENT_MOUSEMOVE:
{
if (select_flag)
{
img.copyTo(showImg);
p1 = Point(select.x, select.y);
p2 = Point(x, y);
rectangle(showImg, p1, p2, Scalar(0, 255, 0), 2);
imshow("img", showImg);
}
}
break;
case EVENT_LBUTTONUP:
{
//显示框出的ROI
Rect roi = Rect(Point(select.x, select.y), Point(x, y));
if (roi.width && roi.height)
{
Mat roiImg = img(roi);
imshow("roi", roiImg);
imwrite("D://video picture//1.jpg", roiImg);
}
select_flag = false;
}
break;
}
}

int main()
{
img = imread("D://Libs//opencv310//opencv//sources//samples//data//aero1.jpg", 1);
showImg = img.clone();
select.x = select.y = 0;
imshow("img", showImg);

while (1)
{
int key = waitKey(10);
switch (key)
{
case 's':
setMouseCallback("img", S_on_Mouse, 0);
break;
}
if (key == 27 || key == 'q')
break;
}
waitKey(0);
return 0;
}

原文链接：https://blog.csdn.net/u013539952/article/details/77171061