Re: Image Delta Compression

In comp.compression Marton Anka <marton at 03am dot com> wrote:
> I'm new to image processing and image compression in general, and I hope
> that the experts here can point me to the right direction. Here's my
> problem:
> Given two 32-bit images with the same dimensions, find a lossless algorithm
> that will produce a delta between the two, detecting moving parts.

  Where do the images come from?  Is there entropy in the low order bits 
(eg, from physical inputs)?  Do "moving parts" always move by unit numbers 
of pixels?  Does a large proportion of the image remain fixed, or could 
everything be offset by (for example) 1.3 pixels in one image?

  Compression is best viewed as applied modelling, so understanding the 
system being modelled is rather important. ;)

Colin Percival