Method and apparatus for dynamically adjusting quantization offset values
US7889790B2 · kind B2 · utility
33Cited by
2References
18Claims
0Family size
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Key dates
| Filing date | Dec 20, 2005 |
| Grant date | Feb 15, 2011 |
| Priority date | — |
| Expiry date | Dec 15, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/126
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An encoding scheme dynamically adjusts a quantization rounding offset parameter used for encoding pictures according to statistics of previously encoded pictures of similar type. A look-up table can be used to store different relative quantization rounding offset parameters associated with different numbers of bits required to encode the pictures. The dynamically adjusted quantization rounding offset scheme achieves better coding performance at high bit rates. In one example, the dynamic quantization offset values are applied to a Uniform-Reconstruction-Quantizer (URQ) used for Laplacian sources.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.