Opencv中將視頻保存爲連續的圖片和連續的圖片保存爲視頻

一直覺得Opencv是個很實用的很偉大的東西，很多功能總是能夠在不經意間實現，下面就將AVI視頻每一幀保存爲圖片（.jpg，.bmp），和連續圖片保存爲視頻來演示一下：

   直接貼代碼，只要學了Opencv一個星期的，絕對看的懂了：

#include <stdlib.h>

#include <stdio.h>

#include <math.h>

#include <cv.h>

#include <highgui.h>

#define NUM_FRAME 300 //只處理前300幀，根據視頻幀數可修改

void Video_to_image(char* filename)

{

printf("------------- video to image ... ----------------n");

//初始化一個視頻文件捕捉器

CvCapture* capture = cvCaptureFromAVI(filename);

//獲取視頻信息

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);

//定義和初始化變量

int i = 0;

IplImage* img = 0;

char image_name[13];

cvNamedWindow( "mainWin", CV_WINDOW_AUTOSIZE );

//讀取和顯示

while(1)

{

img = cvQueryFrame(capture); //獲取一幀圖片

cvShowImage( "mainWin", img ); //將其顯示

char key = cvWaitKey(20);

sprintf(image_name, "%s%d%s", "image", ++i, ".jpg");//保存的圖片名

cvSaveImage( image_name, img);   //保存一幀圖片

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");

//初始化視頻編寫器，參數根據實際視頻文件修改

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);

//創建窗口

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] = "1.avi";

Video_to_image(filename); //視頻轉圖片

return 0;

}

文章摘自 http://blog.sina.com.cn/s/blog_6111ce890100q3i0.html