Energy-Aware System Design by Chong-Min Kyung & Sungjoo Yoo

Author:Chong-Min Kyung & Sungjoo Yoo
Language: eng
Format: epub
Publisher: Springer Netherlands, Dordrecht

6.6.1 Rate-Distortion Model

During the past decades, several distribution models of transformed coefficients were proposed to find the relationship between the rate and distortion in image and video coding systems based on a two-dimensional discrete cosine transform (DCT). Among various models of transformed coefficients, the Laplacian distribution has been widely used.

In [17], two formulas are used for the rate and distortion as functions of the quantization parameter Q. The rate term

(6.3)

was derived from the entropy of a Laplacian distribution random variable with variance σ 2. The distortion model is simply

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