How do I capture images in OpenCV and saving in pgm format?

Question

I am brand new to programming in general, and am working on a project for which I need to capture images from my webcam (possibly using OpenCV), and save the images as pgm f

Answer 1

I believe that the format is chosen from the extension of the filename - so assuming your opencv lib's are linked against the appropriate libs you can do something like: (this is from memory, might not be correct.)

CvCapture* capture = cvCaptureFromCam(0);
IplImage* frame = cvQueryFrame(capture);
while (1) {
    frame = cvQueryFrame(capture);
    cvSaveImage("foo.pgm", &frame);
    sleep(2);
}
cvReleaseImage(&frame);
cvReleaseCapture(&capture);