Method and apparatus for improved video decompression by selection of IDCT method based on image characteristics
US6002801A · kind A · utility
97Cited by
32References
8Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 18, 1995 |
| Grant date | Dec 14, 1999 |
| Priority date | — |
| Expiry date | Apr 18, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/124
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video decoding system examines a block of DCT coefficients prior to computation of an inverse discrete cosine transform (IDCT) to determine the number of nonzero coefficients. A plurality of IDCT engines are available in the video system including an IDCT engine utilizing fewer computations for a sparse picture and an IDCT engine utilizing fewer computations for a nonsparse picture. The video decoding system selects an IDCT engine to minimize the number of computations performed and to thereby reduce the computational burden of IDCT transformation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.