C++ opencv读取视频保存成图片并对图片进行部分截取

Posted 2023-04-01 王往旺

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了C++ opencv读取视频保存成图片并对图片进行部分截取相关的知识，希望对你有一定的参考价值。

#include<opencv2\\core\\core.hpp>
#include<opencv2\\highgui\\highgui.hpp>
#include<opencv2\\imgproc\\imgproc.hpp>
using namespace cv;
#include<iostream>
#include<vector>
using namespace std;
bool drawing_box = false;
bool gotBox = false;
Rect box;
Point downPoint;
Point destination;

void mouseRectHandler(int event, int x, int y, int flags, void* param)

   switch (event)

   case EVENT_MOUSEMOVE:
       if (drawing_box)

           if (x >= downPoint.x && y >= downPoint.y)

               box.x = downPoint.x;
               box.y = downPoint.y;
               box.width = x - downPoint.x;
               box.height = y - downPoint.y;

           if (x >= downPoint.x && y <= downPoint.y)

               box.x = downPoint.x;
               box.y = y;
               box.width = x - downPoint.x;
               box.height = downPoint.y - y;

           if (x <= downPoint.x && y <= downPoint.y)

               box.x = x;
               box.y = y;
               box.width = downPoint.x - x;
               box.height = downPoint.y - y;

           if (x <= downPoint.x && y >= downPoint.y)

               box.x = x;
               box.y = downPoint.y;
               box.width = downPoint.x - x;
               box.height = y - downPoint.y;


       break;

case EVENT_LBUTTONDOWN:

       drawing_box = true;
       downPoint = Point(x, y);
       cout << "起点: " << downPoint << endl;
       break;

case EVENT_LBUTTONUP:

       drawing_box = false;
       destination = downPoint = Point(x, y);
       cout << "终点: " << destination << endl;
       gotBox = true;
       break;
   default:
       break;

void demo9()

   VideoCapture video("D:\\\\data\\\\test.mp4");
   //VideoCapture video(0);
   video.set(CAP_PROP_FRAME_WIDTH, 1920);
   video.set(CAP_PROP_FRAME_HEIGHT, 1080);
   if (!video.isOpened())

       cout << "加载视频失败，请检查文件路径设置！" << endl;
       return;

   long totalFrameNumber = video.get(CAP_PROP_FRAME_COUNT);
   bool flags = true;
   long currentFrame = 0;
   Mat frame;
   namedWindow("video", 1);
   setMouseCallback("video", mouseRectHandler, NULL);

   for (;;)

       video >> frame;
       if (!frame.data)
           break;
       rectangle(frame, box, Scalar(255, 255, 0), 2);
       imshow("video", frame);
       if (gotBox)
           break;
       if (waitKey(50) == 'q')
           break;

//setMouseCallback("video", NULL, NULL);

   for (;;)

       video >> frame;
       if (!frame.data)
           break;
       rectangle(frame, box, Scalar(0, 255, 0), 2);
       imshow("video", frame);
       if (waitKey(30) == 'q')
           break;
       stringstream str;
       str << currentFrame << ".jpg";
       cout << "正在处理第" << currentFrame << "帧" << endl;
       printf("\\n");
       if (currentFrame % 20 == 0)

           frame= frame(box);
           imwrite("D:\\\\data\\\\img\\\\zhen\\\\" + str.str(),frame);

       if (currentFrame >= totalFrameNumber)

           flags = false;

       currentFrame++;

   video.release();