Image compression method and apparatus for suppressing quantization rate in particular region, image expansion method and apparatus therefor, and computer-readable storage medium storing program for the compression or expansion
US7127117B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2002 |
| Grant date | Oct 24, 2006 |
| Priority date | — |
| Expiry date | Jun 13, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/007
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An image compression apparatus includes a tile specifying section specifying rectangular tiles having an arbitrary size with respect to an image, an image dividing section dividing the image using the specified rectangular tiles, a bit-plane decomposing section decomposing each of the specified tiles dividing the image into bit-planes, a bit-plane ordering section ordering the bit-planes decomposing each of the specified tiles depending on a coding sequence, a layer forming section forming layers by the ordered bit-planes, and a suppressing section suppressing a quantization rate of a region low relative to other regions of the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.