Information Technology Reference
In-Depth Information
(㶎)
Without
MC
With
MC
Differential signal between frames
Differential signal by means of MC
(㶎) “Table Tennis” (MPEG standard image)
Fig. 11
Effect of Motion Compensated Prediction
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Differential
signal
between
adjacent
pixels
Motion
compensated
differential
signal between
frames
Differential
signal
between
frames
Original
signal
Entropy [bit/pixel]
7.12
4.37
6.05
4.16
Signal Power (Variance)
118.22
47.89
10.63
0.58
Fig. 12
Characteristics of Picture Signal
3.2.2 Transform
Transform is the method of converting an image signal into another signal do-
main, and centralizing signal power to specific frequency bands. There exist DCT
and DWT for this purpose, which are used in the current picture coding standards.
