Signal adaptive filtering method, signal adaptive filter and computer readable medium for storing program therefor
US6631162B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2000 |
| Grant date | Oct 7, 2003 |
| Priority date | — |
| Expiry date | Jan 14, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20008
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A signal adaptive filtering method for reducing blocking effect and ringing noise. a signal adaptive filter, and a computer readable medium. The signal adaptive filtering method capable of reducing blocking effect and ringing noise of image data when a frame is composed of blocks of a predetermined size includes the steps of: (a) generating blocking information for reducing the blocking effect and ringing information for reducing the ringing noise, from coefficients of predetermined pixels of the upper and left boundary regions of the data block when a frame obtained by deconstructing a bitstream image data for inverse quantization is an intraframe; and (b) adaptively filtering the image data passed through inverse quantization and inverse discrete cosine transform according to the generated blocking information and ringing information. Therefore, the blocking effect and ringing noise can be eliminated from the image restored from the block-based image, thereby enhancing the image restored from compression.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.