# US 7,613,241 B2 · Method of filtering a pixel of an image

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- Number: US 7,613,241 B2
- Document ID: US7613241B2
- Status: Granted
- Kind: B2
- Application number: 11/543,075
- Filed: 2006-10-05
- Published: 2007-02-01
- Granted: 2009-11-03
- Earliest claimed: 2001-06-15
- Assignees: LG Electronics Inc.
- Inventors: Min Cheol Hong
- Web page: https://patentgrep.com/patent/US7613241B2

## CPC

- H04N 19/86: involving reduction of coding artifacts, e.g. of blockiness
- H04N 19/117: Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635)
- H04N 19/124: Quantisation
- H04N 19/139: Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
- H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/182: the unit being a pixel
- H04N 19/61: in combination with predictive coding
- H04N 19/82: involving filtering within a prediction loop
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

In one embodiment, a pixel in a block of the image is filtered according to a filtering methodology. The filtering methodology includes determining a filtering strength value. This determining step determines a first filter strength value if the block has non-zero transform coefficient information and determines a second filter strength value if a motion vector difference between a motion vector of the first block and a motion vector of an adjacent second block is greater than or equal to one. The first filter strength value is greater than the second filter strength value.

## Claims

### Claim 1

A filtering method of a block boundary region in a loop filtering system, the method comprising:
determining a filtering strength with respect to the block boundary region; and
filtering the block boundary region based on the determined filtering strength,
wherein, in the filtering strength determining step, the filtering strength is determined as a first strength based on whether blocks corresponding to a block boundary include non-zero transform coefficient information, or the filtering strength is determined as a second strength based on motion vector information of blocks corresponding to of the block boundary region.

### Claim 2 (depends on 1)

The method of claim 1, wherein the filtering strength is determined as the second strength based on a difference between motion vectors of the blocks corresponding to of the block boundary region.