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Old 13th December 2003, 15:37   #1  |  Link
Le Furet
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Join Date: Apr 2002
Location: France
Posts: 51
How to detect if a frame is a translation of another ?

Hello

I want to make a filter that can create a frame between two successive frames of a travelling, to make it smoother (not blending). More generally, it should be able to recreate entire travelling just by specifying first frame, last frame, and the number of frames between.

So, I must find a way to determinate what was the translation vector between 2 frames.

I've read the sources of some motion compensated filters, but it seems to me that those were looking at only very small moves. It isn't suitable for my purpose. And I'm afraid allowing those algorithms to look for more important moves would lead to such a long time for the filter to process that it would become unusable.

So, I'm looking for others ideas.

I thought a thing : suppose that I analyze the pictures, and by one mean or another, I distinguish several "objects" in a frame. Suppose that to each object, I associate a sequence of "invariants by translation", for example area and perimeter, maybe others. I could then determine how these objects moved between 2 frames by comparing position of objects that have nearly the same "invariants", no ?

Since I'm a bad coder, and so coding the simlest of my ideas could spend to me hours of work, I would like ton know if such an approach was already used by one of you, and if it worked.

Unless, of course, you have another idea, better (i've also thought of using Motion vectors generated by first pass encoding, but I must say I don't know much about them, how to get them, how to understand them, and so on)
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