Apparatus and method for optimizing the rate control in a coding system
US6160846A · kind A · utility
192Cited by
16References
23Claims
0Family size
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Key dates
| Filing date | Oct 23, 1996 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | Oct 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/152
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for selecting a quantizer scale for each macroblock to maintain the overall quality of the video image while optimizing the coding rate. A quantizer scale is selected for each macroblock such that target bit rate for the picture is achieved while an optimal quantization scale ratio is maintained for successive macroblocks to produce a uniform visual quality over the entire picture. One embodiment applies the method to the frame level while another embodiment applies the method in conjunction with a wavelet transform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.