1 August 2009 Rate-distortion optimized adaptive transform coding
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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.
© (2009) Society of Photo-Optical Instrumentation Engineers (SPIE)
Sung-Chang Lim, Dae-Yeon Kim, Se-Yoon Jeong, Jin Soo Choi, Haechul Choi, Yung-Lyul Lee, "Rate-distortion optimized adaptive transform coding," Optical Engineering 48(8), 087004 (1 August 2009). https://doi.org/10.1117/1.3204239 . Submission:
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