Investigations on colour coding in an object-oriented analysis-synthesis coder
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摘要
In this paper, a new colour coding algorithm called Hybrid Adaptive DCT/DPCM Colour Coding is presented which encodes the colour parameters of objects in an object-oriented analysis-synthesis coder with a hybrid scheme, where either a DPCM (Differential Pulse Code Modulation) technique or a DCT (Discrete Cosine Transform) is used whichever allows a more efficient coding. In experimental results, the coding efficiency of the Hybrid Adaptive DCT/DPCM Colour Coding is compared to purely block-oriented DCT coding and region-oriented transform coding for typical videophone sequences at data rates of about 64 kbit/s. The relative gain concerning the average bit-rate at a fixed image quality is about 5% compared to region-oriented transform coding and 41% compared to block-oriented DCT coding. Beside its coding efficiency, Hybrid Adaptive DCT/DPCM Coding can easily be realized by fast algorithms of low computational complexity.
论文关键词:Object-oriented image coding,colour coding,block-oriented DCT coding,region-oriented transform coding,videophone
论文评审过程:Received 6 August 1992, Available online 14 August 2003.
论文官网地址:https://doi.org/10.1016/0923-5965(93)90054-W