Method and apparatus for improved video decompression by predetermination of IDCT results based on image characteristics
US5872866A · kind A · utility
45Cited by
18References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1995 |
| Grant date | Feb 16, 1999 |
| Priority date | — |
| Expiry date | Apr 18, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/625
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A decoding system stores frequently-occurring DCT coefficient blocks in a memory and stores pre-computed spatial domain kernels which correspond to the stored DCT coefficient blocks. The video system examines a block of DCT coefficients prior to computation of an inverse discrete cosine transform (IDCT) to determine whether the block is substantially similar to a stored frequently-occurring DCT coefficient block. If so, the spatial domain kernel corresponding to the frequently-occurring DCT block is utilized in the decoded picture, bypassing computation of the IDCT.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.