How to transfer images / data from a camera in C ++

Question

I have a USB camera connected to a computer (using Windows 7), and I'm trying to create a program for streaming images from the camera.

How can I do it? I have a VID and a PID camera, but I don’t know anything else about it. Please, help.

thanks

Answer 1

If you can use OpenCV, there is a very good example here.

#include "cv.h" #include "highgui.h" #include <stdio.h> // A Simple Camera Capture Framework int main() { CvCapture* capture = cvCaptureFromCAM( CV_CAP_ANY ); if ( !capture ) { fprintf( stderr, "ERROR: capture is NULL \n" ); getchar(); return -1; } // Create a window in which the captured images will be presented cvNamedWindow( "mywindow", CV_WINDOW_AUTOSIZE ); // Show the image captured from the camera in the window and repeat while ( 1 ) { // Get one frame IplImage* frame = cvQueryFrame( capture ); if ( !frame ) { fprintf( stderr, "ERROR: frame is null...\n" ); getchar(); break; } cvShowImage( "mywindow", frame ); // Do not release the frame! //If ESC key pressed, Key=0x10001B under OpenCV 0.9.7(linux version), //remove higher bits using AND operator if ( (cvWaitKey(10) & 255) == 27 ) break; } // Release the capture device housekeeping cvReleaseCapture( &capture ); cvDestroyWindow( "mywindow" ); return 0; }