Image coding and decoding methods and apparatus
US8934725B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 2010 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Oct 12, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/48
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for coding and/or decoding bitplanes are described. Aspects relate to speeding up bitplane coding when one or more entropy coders are used as part of the encoding process. A number, e.g., three, consistent value, e.g., zero value, bitplanes are identified and subjected to coding, e.g., in some embodiments using a JPEG 2000 arithmetic coder. Remaining bitplanes including data are subjected to coding using a second coding process, e.g., an entropy coding process implemented by a JPEG 2000 selective arithmetic bypass coder. By subjecting zero value bitplanes to the coding, e.g., arithmetic coder processing or its equivalent, 3 bitplanes are subjected to fast, easy to implement coding while non-consistent value bitplanes can be coded using selective arithmetic bypass coding. This satisfies the JPEG 2000 requirement that 3 bitplanes be generated in accordance with arithmetic coder processing while avoiding the normal delays associated with processing of non-consistent value bitplanes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.