Image coding apparatus
US7720297B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2006 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Mar 18, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image coding apparatus includes: an entropy coding unit for outputting code data based on control information for every coding pass; a rate control information extracting unit for judging both a continuation and an end of the coding pass based on a calculation result of a distortion and a code amount, which are required in a rate control; and a unit for extracting the code data up to the coding end pass based on control information. The rate control information extracting unit includes: calculation units for calculating both a distortion and a code amount produced by coding each of the coding passes; another calculation unit for calculating a slope based on a relationship between the distortion and the code amount, and a coding pass conducting unit for outputting control information based on a slope, a total code amount of all components, and a total code amount of a specific component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.