# US 8,787,451 B2 · Method of removing a blocking artifact using quantization information in a filtering system

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- Number: US 8,787,451 B2
- Document ID: US8787451B2
- Status: Granted
- Kind: B2
- Application number: 13/836,847
- Filed: 2013-03-15
- Published: 2013-08-08
- Granted: 2014-07-22
- Earliest claimed: 2001-06-15
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Min Cheol Hong
- Web page: https://patentgrep.com/patent/US8787451B2

## 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, the method includes obtaining quantization information related to at least one of a first block and an adjacent second block, comparing the quantization information with a predefined constant value, and performing a filtering process based on the comparing step when both of the first block and the second block are intra-coded blocks according to obtained block type information. The filtering process includes calculating a value of at least one pixel in the first block to obtain a filtered value based on pixel values of at least two pixels in the first block. At least two successive pixels on a block boundary between the first and second blocks are filtered.

## Claims

### Claim 1

A method of removing a blocking artifact using quantization information in a filtering system, comprising:
obtaining quantization information related to at least one of a first block and a second block, the second block being adjacent to the first block;
comparing the quantization information with a predefined constant value that remains fixed over more than one execution of a filtering process for a plurality of frames to determine whether the quantization information is greater than or less than or equal to the predefined constant value;
obtaining block type information for the first and second block, the block type information indicating whether a block is an intra-coded block; and
performing the filtering process based on a result from the comparing step when at least one of the first block and the second block is the intra-coded block according to the block type information,
the filtering process including,
obtaining a filtered value of at least one pixel in the first block based on values of at least two pixels in the first block,
wherein the at least two pixels in the first block are successive pixels in the first block.