Quality/energy tradeoff approach for IDCT computation in MPEG-2 video decoding

Russell Henning, Chaitali Chakrabarti

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations


It would be desirable, in terms of energy conservation, to use a low complexity approximate algorithm to do all IDCT computation in an MPEG-2 decoder. However, there is a significant quality penalty associated with this approach that may not always be acceptable. A practical algorithmic method is presented here for achieving quality/energy tradeoff for a hardware 2-D IDCT in an MPEG-2 decoder. By allowing multiple algorithms to run on the same IDCT hardware, multiple quality/energy tradeoff modes can be supported, and the quality that results when an approximate algorithm is used can be increased. For example, by simply using an approximate algorithm for all B frame IDCT processing, while using a conventional algorithm for I and P frames, it will be shown that 23% energy reduction can be achieved compared to using the conventional algorithm exclusively. This significant energy reduction can be achieved with a quality tradeoff of less than 0.5 dB average PSNR.

Original languageEnglish (US)
Title of host publicationIEEE Workshop on Signal Processing Systems, SiPS: Design and Implementation
Number of pages10
StatePublished - 2000
Event2000 IEEE Workshop on Signal Processing Systems (SIPS 2000) - Lafayette, LA, USA
Duration: Oct 11 2000Oct 13 2000


Other2000 IEEE Workshop on Signal Processing Systems (SIPS 2000)
CityLafayette, LA, USA

ASJC Scopus subject areas

  • General Engineering


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