Some cameras allow you to set the region of interest so as to increase the camera frame rate.
What I would like to know is what would be the best way to query a DirectShow filter provided by a vendor so as to programmatically set and clear the camera region of interest.
Would code to do this be specific to the particular vendor's filter.
It is untypical for a camera, for a video source to use ROI and especially to increase frame rate by capturing smaller region (even though it makes sense in general). So the code will be vendor specific and most likely with the use of vendor SDK or otherwise model specific interfaces/extensions.