Loop filtering method for reducing blocking effects and ringing noise of a motion-compensated image
US5877813A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1996 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | Oct 18, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/82
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A signal adaptive loop filter reduces blocking effects and ringing noise of motion-compensated image data. In the loop filter, binary edge map information on which global thresholding and local thresholding with respect to the motion-compensated image are reflected, is used to judge whether the binary edge map information within a predetermined size of the filter window is either a homogeneous or an edge area. If it is judged as a homogeneous area, predetermined first weight factors corresponding thereto are used for generating a filtered pixel value for the corresponding filter window. While, in the case that it is judged as an edge area, predetermined second weight factors are varied according to the binary edge map information corresponding to pixels, and the filter window having the varied second weight factors is used for generating the filtered pixel value corresponding to respective pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.