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What do you think of the edge detection in the codec I suggested?
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For one thing it would have to be done
before DCT because edges no longer exist in the transformed frame (I think). All spatial information is gone after DCT, only frequency remains; high frequency can just as well mean noise or edges, there's no way to know after the DCT.
Giving a bonus to egdes sounds to me very much like sharpening, and that's not always a good idea, it either creates ringing or increases edge enhancement (->halos). But other than that I have no idea if it would be a good idea in general.
Maybe some real developer can say if it's possible/worthwhile.
Ps. Thanks Manono
EDIT: Yes, edge detection using the DCT coefficients (or another transform for that matter) seems possible but from what I have read it's very complicated too.