java opencv 视频 帧 opencv获取视频帧

（OpenCV读取视频、OpenCV提取视频每一帧、每一帧图片合成新的AVI视频）CvCapture 是视频获取结构 被用来作为视频获取函数的一个参数 比如 CvCapture* cap; IplImage* cvQueryFrame( cap ); 从摄像头或者文件中抓取并返回一帧Opencv读取视频代码

#include "stdafx.h"  
#include"highgui.h"  
  
int main(int argc,char* argv[])  
{  
                cvNamedWindow( "avi");  
                CvCapture* capture = cvCreateFileCapture( "D:\\sample.avi");  
  
                IplImage* frame;  
  
                 while(1)  
                {  
                                frame = cvQueryFrame(capture);  
                                 if(!frame) break ;  
                                   
                                cvShowImage( "avi",frame);  
                                 char c = cvWaitKey(33);  
                                   
                                 if(c == 27)  
                                                 break;  
                }  
                cvReleaseCapture(&capture);  
                   
                cvDestroyWindow( "avi");  
                 return 0;  
}  
// test3.cpp  
//  
// 该程序实现视频和图片的相互转换.  
// Image_to_video()函数将一组图片合成AVI视频文件.  
// Video_to_image()函数将AVI视频文件读入，将每一帧存储为jpg文件.  
//  
  
#include <stdlib.h>  
#include <stdio.h>  
#include <math.h>  
#include <cv.h>  
#include <highgui.h>  
#define NUM_FRAME 300 //只处理前300帧，根据视频帧数可修改  
  
void Video_to_image(char* filename)  
{  
printf("------------- video to image ... ----------------n");  
//初始化一个视频文件捕捉器  
CvCapture* capture = cvCaptureFromAVI(filename);  
//获取视频信息  
cvQueryFrame(capture);  
int frameH    = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT);  
int frameW    = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH);  
int fps       = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);  
int numFrames = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_COUNT);  
printf("tvideo height : %dntvideo width : %dntfps : %dntframe numbers : %dn", frameH, frameW, fps, numFrames);  
//定义和初始化变量  
int i = 0;  
IplImage* img = 0;  
char image_name[13];  
  
cvNamedWindow( "mainWin", CV_WINDOW_AUTOSIZE );  
//读取和显示  
while(1)  
{  
    
   img = cvQueryFrame(capture); //获取一帧图片  
   cvShowImage( "mainWin", img ); //将其显示  
   char key = cvWaitKey(20);  
    
   sprintf(image_name, "%s%d%s", "image", ++i, ".jpg");//保存的图片名  
    
   cvSaveImage( image_name, img);   //保存一帧图片  
  
   if(i == NUM_FRAME) break;  
}  
cvReleaseCapture(&capture);  
cvDestroyWindow("mainWin");  
}  
   
void Image_to_video()  
{  
int i = 0;  
IplImage* img = 0;  
char image_name[13];  
printf("------------- image to video ... ----------------n");  
//初始化视频编写器，参数根据实际视频文件修改  
CvVideoWriter *writer = 0;  
int isColor = 1;  
int fps     = 30; // or 25  
int frameW = 400; // 744 for firewire cameras  
int frameH = 240; // 480 for firewire cameras  
writer=cvCreateVideoWriter("out.avi",CV_FOURCC('X','V','I','D'),fps,cvSize(frameW,frameH),isColor);  
printf("tvideo height : %dntvideo width : %dntfps : %dn", frameH, frameW, fps);  
//创建窗口  
cvNamedWindow( "mainWin", CV_WINDOW_AUTOSIZE );  
while(i<NUM_FRAME)  
{  
   sprintf(image_name, "%s%d%s", "image", ++i, ".jpg");  
   img = cvLoadImage(image_name);  
   if(!img)  
   {  
    printf("Could not load image file...n");  
    exit(0);  
   }  
   cvShowImage("mainWin", img);  
   char key = cvWaitKey(20);  
   cvWriteFrame(writer, img);  
}  
cvReleaseVideoWriter(&writer);  
cvDestroyWindow("mainWin");  
}  
  
int main(int argc, char *argv[])  
{  
char filename[13] = "infile.avi";  
Video_to_image(filename); //视频转图片  
Image_to_video();    //图片转视频  
return 0;  
}