Image encoding device
US7830966B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2005 |
| Grant date | Nov 9, 2010 |
| Priority date | — |
| Expiry date | Sep 9, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The object of the present invention is to provide an image encoding device and decoding device which allows the maximum compression rate to be achieved with a visually uniform level of picture quality.The present invention has a characteristic pixel extractor 0309 which encodes input images by small region unit in accordance with an irreversible compression method, decodes the encoded data which is created, and utilizes the input image and decoded image obtained after decoding to extract characteristic pixels, a characteristic distortion calculator 0311 which utilizes characteristic pixels to calculate characteristic distortion of the decoded image in relation to the input image, and an encoding parameter controller 0312 which controls parameter values determining the degree of data compression in line with the extent of characteristic distortion. The regions of picture quality of a visually uniform level thus obtained are all compressed using an image compression method with a high compression efficiency, thus allowing the maximum compression rate to be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.