我无法在Ubuntu 11.04中将网络摄像头用作OpenCV 2.3.1的输入设备,此代码在Windows上运行正常:
#include "cv.h"
#include "highgui.h"
#include <stdio.h>
// A Simple Camera Capture Framework
int main() {
CvCapture* capture = cvCaptureFromCAM(-1);
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;
}
返回“ERROR:capture is NULL”
答案 0 :(得分:4)
我找到了解决方案,我需要安装libv4l-0
和libv4l-dev
,然后使用USE_V4L=ON
编译OpenCV。