Image data processing apparatus, image data processing method, and program
US8233060B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2006 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Aug 31, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/84
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Image data are compressed such that they do not visually deteriorate. Nonlinear compression and DPCM compression are performed in series. A compressing unit 41 that uses nonlinear transform inputs image data (L bits per pixel) of each color component. Image data are compressed to M bits (M<L) according to a compression transform tale TB1 that has been set up according to image information extracted from original image data. The compressing unit 41 performs compression transform having a characteristic similar to a gamma curve characteristic used in a gamma correction disposed downstream of the compressing unit 41. Image data compressed and transformed to M bits by the nonlinear compressing unit 41 are input to a DPCM compressing unit 42. The DPCM compressing unit 42 finally compresses input data to N bits (for example, N=10) according to a quantization table TB2. The compressed image data are stored to an image memory through a packing section 43.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.