Use OpenCV to decompose the video into single frame pictures and synthesize the video with pictures

What this paper does is based on opencv Convert video frames to picture output , Because a video contains too many frames , Often we don't need all of its frames to be converted into pictures , So we want to be able to set how many frames to rotate the picture again （ This article is set to 30 frame ）, If someone needs only the first few frames , You can also rewrite the code in a similar way .
Procedure 1 ：

#include <iostream>
#include "cv.h"
#include "opencv2/opencv.hpp"
 
using namespace std;
using namespace cv;
 
//  describe ： Convert video frames to picture output 
void main()
{
	//  Get video files 
	VideoCapture cap("J:\\CQH\\DLFR\\lab_face\\video\\DSC_0023.MOV");
 
	//  Get the total number of video frames 
	long totalFrameNumber = cap.get(CV_CAP_PROP_FRAME_COUNT);
	cout << "total frames: " << totalFrameNumber << endl;
 
	Mat frame;
	bool flags = true;
	long currentFrame = 0;
 
	while (flags){
		//  Read every frame of video 
		cap.read(frame);
 
		stringstream str;
		str << "cqh" << currentFrame << ".jpg";
		cout << " Under processing " << currentFrame << " frame " << endl;
		printf("\n");
 
		//  Set every 30 Frame get one frame 
		if (currentFrame % 30 == 0){
			//  Convert frame to picture output 
			imwrite("J:\\CQH\\DLFR\\lab_face\\videoToImages\\DSC_0023\\" + str.str(), frame);
		}
		//  The end condition 
		if (currentFrame >= totalFrameNumber){
			flags = false;
		}
		currentFrame++;
	}
	
	system("pause");
}

Program 2（ Read pictures in batch order ）

#include<opencv2/opencv.hpp>

using namespace cv;

void main()
{
    // Batch reading of pictures （ Orderly ）
    char filename[50];
    char winName[50];
    Mat srcImg;
    for (int i = 1; i < 100; i++)
    {
        sprintf(filename,"%d.bmp",i);
        sprintf(winName,"NO--%d",i);
        srcImg=imread(filename);
        if (srcImg.empty())
            break;
        imshow(winName,srcImg);
    }
    waitKey(0);
    destroyAllWindows();
}

 

Two 、 Decomposing video into pictures

Need to be ahead of time E Disk creation pic Folder , Picture naming by 1,2.... Such numbers are arranged

#include<opencv2/opencv.hpp>

using namespace cv;

void main()
{
    Mat frame;
    char outfile[50];
    VideoCapture cap("E:\\2.avi");
    if (!cap.isOpened())// Open the failure 
        return;
    int totalFrame=cap.get(CV_CAP_PROP_FRAME_COUNT);// Get the total number of video frames 
    for (int i = 1; i <=totalFrame; i++)
    {
        cap>>frame;
        if (frame.empty())
            break;
        sprintf(outfile,"E:\\pic\\%d.bmp",i);
        imwrite(outfile,frame);
        imshow("video",frame);
        waitKey(15);
    }
    cap.release();
    destroyAllWindows();
}

 

3、 ... and 、 Picture synthesis video

#include<opencv2/opencv.hpp>
#include<iostream>
using namespace cv;
using namespace std;

void main()
{
    VideoWriter writer("E:\\out.avi",CV_FOURCC('X','V','I','D'),20,Size(320,240),true);//Size Be consistent with the size of the picture 
    char filename[50];
    Mat frame;
    for (int i = 1; i < 644; i++)
    {
        sprintf(filename,"E:\\pic\\%d.bmp",i);
        frame=imread(filename);
        if(frame.empty())   break;
        writer<<frame;
    }
    cout<<"write end!"<<endl;
    destroyAllWindows();
}

  It turns out that E The root directory generates a out.avi Video file , This directory can be changed by itself , The image source path can also be changed

Reference resources ：https://blog.csdn.net/mr_evanchen/article/details/77733978

            http://www.cnblogs.com/little-monkey/p/7162594.html