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Rate-Distortion Optimized Adaptive Transform Coding
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- Authors
- Sung Chang Lim, Dae Yeon Kim, Se Yoon Jeong, Jin Soo Choi, Haechul Choi, Yung Lyul Lee
- Issue Date
- 2009-08
- Citation
- Optical Engineering, v.48, no.8, pp.1-43
- ISSN
- 0091-3286
- Publisher
- SPIE
- Language
- English
- Type
- Journal Article
- 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-Lo챔ve 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 Bjontegaard Delta-RATE gain up to 5.49% compared to Joint model 11.0. © 2009 Society of Photo-Optical Instrumentation Engineers.