Image coding apparatus utilizing a plurality of different quantization-width estimation methods
US5822463A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1997 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Aug 25, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/152
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image transforming section subjects image data to compression processing. A quantizing section quantizes the transformed data using a quantization width. A variable-length coding section subjects the quantized data to variable-length coding. A code-amount computing section determines a total code amount by accumulating partial code amounts. A control section performs control based on the code amount. An estimating method selecting section adaptively selects a quantization width estimating method. A coded result storage section stores data of a code amount corresponding to the quantization width. First and second quantization width estimating sections have different quantization width estimating methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.