我无法使用 opencv 2.4.3 访问网络摄像头。
我的系统:
HP Probook 4530s - HP 固定式高清网络摄像头
Ubuntu 12.10
OpenCV 2.4.3
如果我想捕捉我的内置相机,我会收到错误:捕捉为空
我正在使用http://opencv.willowgarage.com/wiki/CameraCapture示例代码。
示例代码是:
#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;
}
我还使用打字终端尝试了xawtv -hwscan 。我得到这个输出:
looking for available devices
port 129-144
type : Xvideo, image scaler
name : Intel(R) Textured Video`
/dev/video0: OK
[ -device /dev/video0 ]
type : libv4l
name : HP HD Webcam [Fixed]
flags: capture
然后我可以输入xawtv video0访问我的网络摄像头。我想我的网络摄像头没有问题。我对opencv有问题。