use 'cvGoodFeaturesToTrack' with a mask

Hi,

I want to use the function 'cvGoodFeaturesToTrack'.
Till now I used it with mask = NULL. Now I just want to find good
features in the middle of my image.

Can anybody give me an example how I have to prepare the parameter
'const CvArr* mask' that I just get the features in the middle of the
image (Roi height 150, width 150).

Thanks a lot in advance.







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