Image processing system and image processing method
US6704455B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1998 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | May 28, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A dividing portion divides input image data into a plurality of block data, a block expressed by each of said plurality of block data comprising a pixel matrix of the same predetermined size. A transform portion transforms each of the plurality of block data by a frequency transform method so as to produce a transform factor. A quantizing portion, having a plurality of quantization tables, quantizes the transform factor using one of the plurality of quantization tables. An encoding portion encodes an output of the quantizing portion. A reverse transform portion restores image data from the output of the quantizing portion. A measuring portion measures an error between the input image data and the image data restored by the reverse transform portion. The quantizing portion quantizes the transform factor again using another one of the plurality of quantization tables when the error measured by the measuring portion exceeds a predetermined threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.