Image processing method and image processing apparatus
US6807316B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 2001 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Dec 2, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20208
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An image processing method and apparatus arranged to output an image signal for reproducing an image of favorable quality without any considerable reduction in contrast and sharpness even from a high-contrast wide-dynamic-range image by performing dynamic range compression processing, which is as effective as the conventional dodging. Also, the method and apparatus are effective in reducing appearance of a pseudo edge band, which is caused when dynamic range compression is performed at a high compression ratio. A plurality of unsharp image signals representing unsharp images of an original image are generated from an image signal representing the original image. One synthesized unsharp image signal is generated from the plurality of unsharp image signals. The dynamic range compression processing is performed on the image signal of the original image on the basis of the synthesized unsharp image signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.