Opening a image and .avi file and Webcam Video on VC2008 console window using OpenCV2.3

If you don't know how to set OpenCV configuration on Visual Studio 2008, please read previous post. This post continue to follow Open CV study.

I try to open jpg image and avi videoclip in VC2008 console window, and I try also to connect webcam with console window.

At first, type like below. and build and run!

#include <cv.h>

#include <highgui.h>

int main()

{

        IplImage* img = cvLoadImage( "test.jpg" ); 

//"test.jpg" should be in where you are coding; open a image file

        cvNamedWindow( "window1", CV_WINDOW_AUTOSIZE ); //to create window

        cvShowImage( "window1", img ); //poject image file in window made before

        cvWaitKey(0);//wait until next keyboard input

        cvReleaseImage( &img ); //memory release

        cvDestroyWindow( "window1" ); //close window

        return 0;

}

Result

you did one of the three missions!

Second, type this below, and build and run!

#include <cv.h>

#include <highgui.h>

int main()

{

        cvNamedWindow( "yadong", 0 ); //open a new window, size is not determined

        cvResizeWindow( "yadong", 200,200); //determine window size

        cvMoveWindow( "yadong", 100,100); //place window,

        CvCapture* capture = cvCreateFileCapture( "test.avi" ); //open avi file and ready to capture.

        IplImage* frame; //this variable is for captured image.

        char key;

        while(1)

        {

               frame = cvQueryFrame( capture );//captured image from video is saved in this pointer for instance.

               if( !frame ) break;

               cvShowImage( "yadong", frame ); //project image into window

               key = cvWaitKey(20); //wait 20ms for check keyboard input

               if( key == 27 ) break; //27 means 'ESC'

        }

        cvReleaseCapture( &capture );

        cvDestroyWindow( "yadong" );

       

        return 0;

}

Result

Second mission completed!

Finally, Let's connect and project webcam video on the console window.

#include <cv.h>

#include <highgui.h>

int main()

{

        IplImage *frame;

        CvCapture *pCamera;

        int key;

        pCamera = cvCaptureFromCAM(0);

       

        cvNamedWindow( "molka", CV_WINDOW_AUTOSIZE);

        while(1)

        {

               frame = cvQueryFrame( pCamera );

               cvShowImage( "molka", frame);

              

               key = cvWaitKey(30);

               if( (char)key==27 ) break;

        }

        cvReleaseCapture(&pCamera);

        cvDestroyWindow("molka");

        return 0;

}

Result