# US 11,310,495 B2 · Systems and methods for applying deblocking filters to reconstructed video data

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- Number: US 11,310,495 B2
- Document ID: US11310495B2
- Status: Granted
- Kind: B2
- Application number: 16/337,421
- Filed: 2017-08-21
- Published: 2019-09-12
- Granted: 2022-04-19
- Earliest claimed: 2016-10-03
- Assignees: Sharp Kabushiki Kaisha; FG Innovation Company Limited
- Applicants: Sharp Kabushiki Kaisha; FG Innovation Company Limited
- Inventors: Seung-Hwan Kim; Jie Zhao; Kiran Mukesh Misra; Christopher Andrew Segall
- Web page: https://patentgrep.com/patent/US11310495B2

## CPC

- H04N 19/117: Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635)
- H04N 19/136: Incoming video signal characteristics or properties
- H04N 19/14: Coding unit complexity, e.g. amount of activity or edge presence estimation (H04N19/146 takes precedence)
- H04N 19/157: Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/182: the unit being a pixel
- H04N 19/186: the unit being a colour or a chrominance component
- H04N 19/86: involving reduction of coding artifacts, e.g. of blockiness
- H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A method of filtering reconstructed video data, the method comprising: determining whether one or more conditions associated with the adjacent reconstructed video blocks are satisfied; selecting a filter based on whether the one or more conditions are satisfied; modifying sample values in the adjacent reconstructed video blocks based on the selected filter.

## Claims

### Claim 1

A method of deblock filtering adjacent video data blocks in a video picture, the method comprising:
for each pair of adjacent video blocks:
receiving component color values for each video block in the pair;
determining whether a set of one or more conditions associated with the pair of adjacent video blocks are satisfied, the set of conditions comprising one or more conditions relating to sizes of the video blocks in the pair;
selecting, from a plurality of candidate filters to apply to chroma component color values of the pair of adjacent video blocks, one filter based on the determination of whether the set of one or more conditions is satisfied;
using the selected filter to modify the chroma component color values in the pair of adjacent video blocks;
wherein for a first pair of adjacent video blocks that share a horizontal boundary, the plurality of candidate filters comprises (i) a first filter for modifying chroma component color values in rows of chroma component color values, the rows including rows in each video block in the first pair, and (ii) a second filter for modifying chroma component color values in one row that is adjacent to the horizontal boundary in each video block in the first pair; and
wherein when the pair of adjacent video blocks share a horizontal boundary, using the selected filter to modify the chroma component color values of the pair of adjacent video blocks comprises:
using the first filter to modify at least three rows in a first video block of the pair based on:
at least four rows of the first video block of the pair, and
at least two rows of a second video block of the pair; and
using the first filter to modify at least three rows of the second video block based on:
at least four rows of the second video block, and
at least two rows of the first video block.

### Claim 2 (depends on 1)

The method of claim 1, wherein conditions relating to the sizes of the video blocks comprise conditions relating to widths of the video blocks.

### Claim 3 (depends on 1)

The method of claim 1, wherein the plurality of candidate filters for adjacent video blocks that share a boundary comprises at least three candidate filters for the chroma component color values.

### Claim 4 (depends on 1)

The method of claim 1, wherein when the pair of adjacent video blocks share a vertical boundary, using the selected filter to the modify chroma component color values of the pair of adjacent video blocks comprises:
using the first filter to modify at least three columns in a first video block of the pair based on:
at least four columns of the first video block of the pair, and
at least two columns of a second video block of the pair; and using the first filter to modify at least three columns in the second video block based on:
at least four columns of the second video block, and
at least two columns of the first video block.

### Claim 5 (depends on 4)

The method of claim 4, wherein
the first filter is a strong filter, and
the second filter is a weak filter.

### Claim 6 (depends on 1)

The method of claim 1, wherein
the first filter is a strong filter, and
the second filter is a weak filter.