video.cpp

opencv codes in C++ (linux and eclipse)

//opencv C++ code to create a video

#include "cv.h" 
#include "highgui.h" 
#include<stdio.h>
	/* creating video from the image */
int main()
{
  	int key;
 
 	IplImage* img = cvCreateImage(cvSize(500,500), 8, 3);  /*create new image to display line and rectangle*/
 	IplImage* outimg = 0;
 	
 	CvPoint x1 = cvPoint(250,0); /*coordinates of the line */
 	CvPoint y1 = cvPoint (250,495);
 
 	CvScalar color = CV_RGB(255,255,0);  /*line color */
    
 	cvLine(img, x1,y1,color,20,CV_AA,0); /*line, CV_AA means Anti Aliasing*/
 
    CvVideoWriter *writer = 0; //pointer for out put video
	
	int fps = 20;  
	int frameW = 500; 
	int frameH = 500; 
	
	writer=cvCreateVideoWriter("output.avi",CV_FOURCC('D','I','V','X'),fps,cvSize(frameW,frameH));     
  	
 	for (int i = 100; i<=300; i++)
 	{
 		 		 
 		 CvPoint a1 = cvPoint(i,350-i);
 		 CvPoint b1 = cvPoint (i+100,450-i); 
 		 
 		 cvRectangle( img, a1, b1, CV_RGB(204,255,255), CV_FILLED );
 		 cvNamedWindow("Line",1);
 		 cvShowImage("Line", img);
 		 key = cvWaitKey(2);
 		 outimg =cvCloneImage(img);
 		
 		 cvRectangle( img, a1, b1, CV_RGB(0,0,0), CV_FILLED );
 		 cvLine(img, x1,y1,color,20,CV_AA,0); 
 		 
 		 cvWaitKey(100);
 		 /*frame */ 
 		
 		 cvWriteFrame(writer,outimg);	 
 		 }
 	cvWaitKey(0);
 
 	/* destroy and release image*/
 	cvDestroyWindow( "Line" );
 	
 	cvReleaseImage( &img);
 	cvReleaseVideoWriter( &writer );/*releasing the Video writer*/
 	return 0;
}