Moving picture coding apparatus
US6430222B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1999 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Jul 6, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The coding mode determining section, when receiving the information as to occurrence of a scene change from the scene change detector, outputs a piece of mode control information to the coding controller. The coding controller, based on the amount of coding in the coder and the mode control information, controls the quantizer by setting up a quantization stepsize so that the current frame will have the target amount of coding. In this way, the quantization and coding are controlled by three stages, i.e., immediately after a scene change, from the scene change to the stabilization of the amount of coding, and after the stabilization of the amount of coding, to thereby prevent degradation of picture quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.