Method and apparatus for image coding
US6563872B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 3, 2001 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Jul 3, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of coding a moving picture includes dividing a picture into a plurality of blocks, and selectively performing one of global motion compensation processing and local motion compensation processing on each of the blocks to obtain predictive errors for the block, orthogonally transforming the predictive errors to obtain orthogonal transform coefficients, and quantizing the orthogonal transform coefficients using a quantizing parameter. Which type of motion compensation processing is performed for each block is determined based on a result of comparing evaluation values for the two types of motion compensation processings with each other. The evaluation values are calculated based on (1) a sum of absolute values of predictive errors for the block obtained when the type of compensation processing is performed on the block and (2) a value determined by the quantizing parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.