Content-based video compression

A method of motion compensation in an object-oriented video stream, comprising the steps of:

• (a) providing a frame with a single object;
• (b) replacing the background in said frame with a constant;
• (c) providing a second frame, said second frame following said frame;
• (d) for each block of pixels of said second frame and related to said object, comparing said block with second blocks of pixels in the result of step (b);
• and
• (e) defining a motion vector for said block by the comparisons of said step (d).