Question

ok I have this code

IplImage *frame;
CvCapture *capture = cvCaptureFromCAM(0);
frame = cvQueryFrame(capture);
cvSaveImage("sample.jpg",frame);
cvReleaseImage(&frame);

which saves an image, but after saving that image, I want to release that camera so that it closes. Now the camera stays on until the program stops, I want to relase and close the camera exactly after cvReleaseImage(&frame);

I tried

cvReleaseCapture(&capture)

but it gives me a runtime error: the application has requested the Runtime to terminate in an unusual way and this error

OpenCV Error: Bad argument (unrecognized or unsupported array type)
in unknown function, file ……\modules\core\src\array.cpp, line
996

Answer 1

I am not completely sure. But try removing the cvReleaseImage call.

I remember that the image-pointer retrieved by the cvQueryImage method points allways at the same adress. so my guess is that this image-data is managed by the capture. so releasing it is done when you release the capture.

EDIT:

found here:
http://opencv.jp/opencv-1.0.0_org/docs/ref/opencvref_highgui.htm

The function cvQueryFrame grabs a frame from camera or video file,
decompresses and returns it. This function is just a combination of
cvGrabFrame and cvRetrieveFrame in one call. The returned image should
not be released or modified by user.