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How to access past frames on DM6437 by using FVID functions

Hi,

I'm studying on video stabilization project on DM6437 .

I could capture frames and display them out by using FVID_exchange function.And I could access pixels on current frame.

I have to compare past frame and current frame .But I can only do operations on current frame.

How can I access past frame ?

 

Best Regards...