November 2014
Intermediate to advanced
236 pages
7h 4m
English
book
Image and Video Compression
by Madhuri A. Joshi, Mehul S. Raval, Yogesh H. Dandawate, Kalyani R. Joshi, Shilpa P. Metkar
Content preview from Image and Video Compression
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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
F
t
is the current frame and
−
F
t 1
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
yw
xy
inside a search window of size ±w pixels such that
−≤
≤+
wwwy w,
x
. The optimum motion vector that minimizes the block dis-
tortion ...
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