Noise filter for video compression
US7920628B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2005 |
| Grant date | Apr 5, 2011 |
| Priority date | — |
| Expiry date | Jan 19, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and system for reducing noise in a video stream comprising images divided into macroblocks, where each macroblock includes luma and chroma blocks and each block is comprised of pixels. The method comprises determining correlation of a macroblock with a reference macroblock, comparing its motion vectors to a predetermined threshold, computing a residual signal of the macroblock by subtracting the macroblock from a predicted macroblock, computing a variance of a residual signal of the macroblock, comparing the variance of the residual signal to another predetermined threshold, determining a filter strength for the macroblock based on one or more of factors such as correlation, motion vector size and variance of the residual signal and filtering the macroblock using a filter of appropriate strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.