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Optical Engineering

Rate-distortion optimized adaptive transform coding
Author(s): Sung-Chang Lim; Dae-Yeon Kim; Se-Yoon Jeong; Jin Soo Choi; Haechul Choi; Yung-Lyul Lee
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Paper Abstract

We propose a rate-distortion optimized transform coding method that adaptively employs either integer cosine transform that is an integer-approximated version of discrete cosine transform (DCT) or integer sine transform (IST) in a rate-distortion sense. The DCT that has been adopted in most video-coding standards is known as a suboptimal substitute for the Karhunen-Loève transform. However, according to the correlation of a signal, an alternative transform can achieve higher coding efficiency. We introduce a discrete sine transform (DST) that achieves the high-energy compactness in a correlation coefficient range of -0.5 to 0.5 and is applied to the current design of H.264/AVC (advanced video coding). Moreover, to avoid the encoder and decoder mismatch and make the implementation simple, an IST that is an integer-approximated version of the DST is developed. The experimental results show that the proposed method achieves a Bjøntegaard Delta-RATE gain up to 5.49% compared to Joint model 11.0.

Paper Details

Date Published: 1 August 2009
PDF: 14 pages
Opt. Eng. 48(8) 087004 doi: 10.1117/1.3204239
Published in: Optical Engineering Volume 48, Issue 8
Show Author Affiliations
Sung-Chang Lim, Electronics and Telecommunications Research Institute (Korea, Republic of)
Dae-Yeon Kim, Sejong Univ. (Korea, Republic of)
Se-Yoon Jeong, Electronics and Telecommunications Research Institute (Korea, Republic of)
Jin Soo Choi, Electronics and Telecommunications Research Institute (Korea, Republic of)
Haechul Choi, Electronics and Telecommunications Research Institute (Korea, Republic of)
Yung-Lyul Lee, Sejong Univ. (Korea, Republic of)


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