Compression techniques
US7492822B2 · kind B2 · utility
6Cited by
1References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2003 |
| Grant date | Feb 17, 2009 |
| Priority date | — |
| Expiry date | Sep 2, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a video encoder a prediction signal at a bit resolution of P is subtracted from an input signal received at a bit resolution of P+Δ, where P is typically 8 bits, and P+Δ, 10 bits. A transform is then performed on the result, the output of which transform being at a bit resolution of at least P+Δ. The transformed signal is quantised, and the quantised signal used to form the prediction signal. The quantised signal is then coded for downstream delivery. At a decoder, the process is inverted, preserving the extra Δ bits input to the encoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.