Motion video compression system with inverse discrete cosine transform mismatch control
US5604502A · kind A · utility
13Cited by
4References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1994 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Mar 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A novel method and apparatus is disclosed for controlling inverse discrete cosine transform ("IDCT") mismatch between an encoder and decoder using different IDCT implementations under all coding conditions. Sychronization between the encoder and decoder is forced by selectively setting certain small DCT coefficients, which are prone to mismatch, to zero at the encoder. Advantageously, the invention may be implemented solely in the encoder to minimize system complexity and cost, and allow for IDCT mismatch control utilizing conventional decoders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.