opencv学习之路（3）、批量读取图片、视频分解、视频合成

一、批量有序读取图片

 #include<opencv2/opencv.hpp>

 using namespace cv;

 void main()
 {
     //批量读取图片（有序）
     char filename[];
     char winName[];
     Mat srcImg;
     for (int i = ; i < ; i++)
     {
         sprintf(filename,"%d.bmp",i);
         sprintf(winName,"NO--%d",i);
         srcImg=imread(filename);
         if (srcImg.empty())
             break;
         imshow(winName,srcImg);
     }
     waitKey();
     destroyAllWindows();
 }

二、视频分解成图片

需要提前在E盘创建pic文件夹

 #include<opencv2/opencv.hpp>

 using namespace cv;

 void main()
 {
     Mat frame;
     char outfile[];
     VideoCapture cap("E:\\2.avi");
     if (!cap.isOpened())//打开失败
         return;
     int totalFrame=cap.get(CV_CAP_PROP_FRAME_COUNT);//获取视频总帧数
     for (int i = ; i <=totalFrame; i++)
     {
         cap>>frame;
         if (frame.empty())
             break;
         sprintf(outfile,"E:\\pic\\%d.bmp",i);
         imwrite(outfile,frame);
         imshow("video",frame);
         waitKey();
     }
     cap.release();
     destroyAllWindows();
 }

三、图片合成视频

 #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'),,Size(,),true);//Size要和图片尺寸保持一致
     char filename[];
     Mat frame;
     for (int i = ; i < ; i++)
     {
         sprintf(filename,"E:\\pic\\%d.bmp",i);
         frame=imread(filename);
         if(frame.empty())   break;
         writer<<frame;
     }
     cout<<"write end!"<<endl;
     destroyAllWindows();
 }