Arithmetic coding apparatus and image processing apparatus
US6677869B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 2002 |
| Grant date | Jan 13, 2004 |
| Priority date | — |
| Expiry date | Jan 17, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/4006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An arithmetic coding apparatus for carrying out complete pipeline processing is provided. This arithmetic coding apparatus analyzes an input image, reads image information accurately and performs arithmetic coding at ultra-high speed. Using a future prediction type Qe memory removes disturbance in the pipeline caused by renormalization. The arithmetic coding apparatus also generates a common context when coding multi-valued images without distinguishing between an AC component and DC component of a DCT coefficient. The apparatus is also provided with a circuit for outputting an arithmetic code which is a variable-length code with the length fixed to facilitate editing of a reconstructed image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.