问题
I am capturing the image using OpenCV in C++
firstFrame = cvQueryFrame(capture);
it is easy to set the width and height properties by
cvSetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH, WIDTH );
cvSetCaptureProperty( capture, CV_CAP_PROP_FRAME_HEIGHT, HEIGHT );
I wonder if there is a way to specify the color depth as well without further processing the frame?
回答1:
According to the documentation, you should be able to do it using CV_CAP_PROP_FORMAT if you use the function retrive() to get your frame.
CV_CAP_PROP_FORMAT Format of the Mat objects returned by retrieve() .
However, notice also that:
When querying a property that is not supported by the backend used by the VideoCapture class, value 0 is returned.
回答2:
Have forked a seperate branch on github, with changes to videoio to support custom streams & formats.
Git hub repo link
https://github.com/shawndfernandes/opencv
Added support for custom stream & depth for opencv capture, reverts to default opencv values if not set.
Set via VideoWriter::set method
CV_CAP_PROP_DEPTH
matrix_depth = 8,16 //* for 8U and 16 for 16U depth
CV_CAP_PROP_STREAM
stream_format = 1,2,3,4,5…12; //choose the raw camera stream via V4L
"BGR24" 1:
"YVU420" 2:
"YUV411P" 3:
"MJPEG" 4:
"JPEG" 5:
"YUYV" 6:
"UYVY" 7:
"SN9C10X" 8:
"SBGGR8" 9:
"SGBRG8" 10:
"RGB24" 11:
"Y16" 12:
来源：https://stackoverflow.com/questions/21555572/can-i-set-the-color-depth-while-capturing-the-webcam-image-using-opencv