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US 8,798,173 B2Granted
Adaptive filtering based upon boundary strength
AssigneeSharp Kabushiki Kaisha
InventorsShijun Sun, Shawmin Lei, Hiroyuki Katata
Life of this patent
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Abstract
Adjacent regions are identified in an image. Coding parameters for the adjacent regions are identified. Selective filtering is performed at the region between the identified adjacent regions.
Claims6
A method for at least one of encoding and decoding an image, the image including a plurality of frames with each frame including a plurality of blocks, each having a plurality of pixels, the method comprising:
- identifying adjacent blocks of a frame of said image;
- examining conditions of coding parameters for said adjacent blocks of said frame;
- determining boundary strengths for a boundary between said adjacent blocks of said frame;
- and
- selectively filtering at least a portion of said image proximate a boundary between said adjacent blocks of said frame based upon said conditions of coding parameters, wherein
- said conditions of coding parameters include whether said adjacent blocks of said frame have an absolute difference of motion vector components which is less than a threshold value in both vertical direction and horizontal direction,
- a strength of said selectively filtering is controlled by said boundary strength for said adjacent blocks of said frame,
- said boundary strength is a first value when said adjacent blocks of said frame have an absolute difference of motion vector components which is greater than or equal to a threshold value in either the vertical direction or the horizontal direction, and
- the boundary strength value is used to control a pixel value adaptation range in a loop filter.
6 more elements
An encoder for encoding an image, the image including a plurality of frames with each frame including a plurality of blocks, each having a plurality of pixels, the encoder comprising:
- an identifier portion configured to identify adjacent blocks of a frame of said image;
- a condition examiner portion configured to examine conditions of coding parameters for said adjacent blocks of said frame;
- a determiner portion configured to determine boundary strengths for a boundary between said adjacent blocks of said frame;
- and
- a selective filter selectively filtering at least a portion of said image proximate a boundary between said adjacent blocks of said frame based upon said conditions of coding parameters, wherein
- said conditions of coding parameters include whether said adjacent blocks of said frame have an absolute difference of motion vector components which is less than a threshold value in both vertical direction and horizontal direction,
- a strength of said selectively filtering is controlled by said boundary strength for said adjacent blocks of said frame,
- said boundary strength is a first value when said adjacent blocks of said frame have an absolute difference of motion vector components which is greater than or equal to a threshold value in either the vertical direction or the horizontal direction, and
- the boundary strength value is used to control a pixel value adaptation range in a loop filter.
6 more elements
A decoder for decoding an image, the image including a plurality of frames with each frame including a plurality of blocks, each having a plurality of pixels, the decoder, comprising:
- an identifier portion configured to identify adjacent blocks of a frame of said image;
- a condition examiner portion configured to examine conditions of coding parameters for said adjacent blocks of said frame;
- a determiner portion configured to determine boundary strengths for a boundary between said adjacent blocks of said frame;
- and
- a selective filter selectively filtering at least a portion of said image proximate a boundary between said adjacent blocks of said frame based upon said conditions of coding parameters, wherein
- said conditions of coding parameters include whether said adjacent blocks of said frame have an absolute difference of motion vector components which is less than a threshold value in both vertical direction and horizontal direction,
- a strength of selectively filtering by the filter is controlled by said boundary strength for said adjacent blocks of said frame,
- said boundary strength is a first value when said adjacent blocks of said frame have an absolute difference of motion vector components which is greater than or equal to a threshold value in either the vertical direction or the horizontal direction, and
- the boundary strength value is used to control a pixel value adaptation range in a loop filter.
6 more elements
Dependencies are inferred from the claim text.