OpenCV로 웹캠 읽어오기

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/////////////////////////////////////////////////////
// trialcam1a.cpp
// A Simple Camera Capture Framework
// This program will connect to a camera then
// show the frames in a window
/////////////////////////////////////////////////////
#include <stdio.h>
#include <cv.h>
#include <highgui.h>
 
int main()
{
IplImage *frame = NULL; //Preparing frame pointer 
int key; 
 
//Allocates and initializes cvCapture structure
// for reading a video stream from the camera. 
//Index of camera is -1 since only one camera
// connected to the computer or it does not
// matter what camera to use.
CvCapture *input_camera = cvCaptureFromCAM(-1); 
 
//Grabs and returns a frame from camera 
frame = cvQueryFrame(input_camera);
 
//Creates window for displaying the frames
//Flag is reset (0) --> change window size 
// manually
cvNamedWindow("Capturing Image ...", 0);
 
//Change to the appropriate size. In GTK, the
// inappropriate size will return a segmentation
// fault. I don't know why ...
//Gets the appropriate size using cvGetCaptureProperty
// with CV_CAP_PROP_FRAME_HEIGHT and CV_CAP_PROP_FRAME_WIDTH
// as property_id 
cvResizeWindow("Capturing Image ...",
(int) cvGetCaptureProperty(input_camera, CV_CAP_PROP_FRAME_HEIGHT),
(int) cvGetCaptureProperty(input_camera, CV_CAP_PROP_FRAME_WIDTH));
 
while(frame != NULL)
{
//Shows a frame 
cvShowImage("Capturing Image ...", frame);
 
//Checks if ESC is pressed and gives a delay 
// so that the frame can be displayed properly
key = cvWaitKey(10); 
if(key == 27)
break;
//Grabs and returns the next frame
frame = cvQueryFrame(input_camera);
}
 
//Release cvCapture structure
cvReleaseCapture(&input_camera);
 
//Destroy the window 
cvDestroyWindow("Capturing Image ...");
 
return 0;
}
 

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