
121Digital Video Compression
6.9.1 Block Distortion Measure
The success of the block-matching method mostly depends on substitution
of the block in the compressed frame for the replacement of the original
block. The block distortion measure function plays an important role in nd-
ing out the similarity between the target block and candidate blocks.
Assume that
is the current frame and
is the reference frame.
F(x,y) is the intensity of a pixel at (x,y) in frame F. Each candidate block is
located at
(,)xw
inside a search window of size ±w pixels such that
≤+
. The optimum motion vector that minimizes the block dis-
tortion ...