Method and apparatus for accelerating variable length coding (VLC) decoding in the process of inverse discrete cosine transformation (IDCT)
US7224841B2 · kind B2 · utility
0Cited by
7References
39Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 29, 2002 |
| Grant date | May 29, 2007 |
| Priority date | — |
| Expiry date | Jun 15, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/42
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In some embodiments of the present invention, frequently occurring inverse linear transform results are calculated and stored in look-up-tables. In real time, incoming blocks of linear transform coefficients are divided into two or more groups. A numerical code is determined for each group and checked against a look-up-table for that group to see whether it corresponds to a pre-calculated inverse linear transform result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.