5、【opencv入门】批量图区图片、视频分解、视频合成

一、批量有序读取图片

【示例】

//批量有序读取图片
#include <opencv2/opencv.hpp>
#include <iostream>
#include <stdio.h>

using namespace std;
using namespace cv;

int main()
{
    //批量读取图片（有序）
    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();
    return 0;
}

二、视频分解成图片

【示例】

//视频分解成图片
#include <opencv2/opencv.hpp>
#include <stdio.h>

using namespace cv;

int main()
{
    Mat frame;
    char outfile[50];
    VideoCapture cap("../../1.mp4");
    if (!cap.isOpened())//打开失败
        return -1;
    int totalFrame=cap.get(CV_CAP_PROP_FRAME_COUNT);//获取视频总帧数
    for (int i = 1; i <=totalFrame; i++)
    {
        cap>>frame;
        if (frame.empty())
            break;
        sprintf(outfile,"%d.bmp",i);
        imwrite(outfile,frame);
        imshow("video",frame);
        waitKey(15);
    }
    cap.release();
    destroyAllWindows();
    return 0;
}

 

三、图片合成视频

【示例】

//图片合成视频
#include<opencv2/opencv.hpp>
#include<iostream>
#include<stdio.h>

using namespace cv;
using namespace std;

int main()
{
    VideoWriter writer("out.avi",CV_FOURCC('X','V','I','D'),20,Size(544,960),true);//Size要和图片尺寸保持一致
    char filename[50];
    Mat frame;
    for (int i = 1; i < 301; i++)
    {
        sprintf(filename,"%d.bmp",i);
        frame=imread(filename);
        if(frame.empty())   break;
        writer<<frame;
    }
    cout<<"write end!"<<endl;
    destroyAllWindows();

    return 0;
}