Method and apparatus for controlling amount of quantization processing in an encoder
US7042941B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2001 |
| Grant date | May 9, 2006 |
| Priority date | — |
| Expiry date | Dec 13, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for controlling the amount of quantization processing used within an encoder that compresses video and/or audio data include processing that begins by receiving discrete cosine transform data of a block of a frame of data. The process then proceeds by obtaining a quantization table related to the frame of data. The processing then continues by obtaining a quantization scaling factor related to the frame. The processing then continues by determining whether quantization processing limits have been exceeded for quantization of preceding blocks of the frame of data. If the number of bits processed for the preceding blocks exceeds a certain desired level, the processing increases the quantization scaling factor. The processing then continues by generating quantization data from the discrete cosine transform data, the quantization table and the increased quantization scaling factor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.