System and method for static perceptual coding of macroblocks in a video frame
US6864909B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 2002 |
| Grant date | Mar 8, 2005 |
| Priority date | — |
| Expiry date | May 11, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/15
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention allows video images with improved subjective quality to be transmitted without a concomitant increase in a total number of bits transmitted per frame. Quantization parameters are applied to coefficients of macroblocks within a given video frame. A lower value of quantization parameter is applied near a central region of a video frame. This central region is referred to as a prime video region. Applying a lower quantization parameter to the prime video region has the effect of increasing the bit density within that area thereby improving the video quality. Outside of the prime video region, the bit density is progressively decreased on a macroblock-by-macroblock basis so as to have a zero or near-zero net-gain in bit density over the entire video frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.