US 9,432,700 B2Granted

Adaptive loop filtering in accordance with video coding

AssigneeBroadcom Corporation

InventorsPeisong Chen, Ba-Zhong Shen, Wade K. Wan

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Abstract

Adaptive loop filtering in accordance with video coding. An adaptive loop filter (ALF) and/or other in-loop filters (e.g., sample adaptive offset (SAO) filter, etc.) may be implemented within various video coding architectures (e.g., encoding and/or decoding architectures) to perform both offset and scaling processing, only scaling processing, and/or only offset processing. Operation of such an ALF may be selective in accordance with any of multiple respective operational modes at any given time and may be adaptive based upon various consideration(s) (e.g., desired complexity level, processing type, local and/or remote operational conditions, etc.). For example, an ALF may be applied to a decoded picture before it is stored in a picture buffer (or digital teacher buffer (DPB)). An ALF can provide for coding noise reduction of a decoded picture, and the filtering operations performed thereby may be selective (e.g., on a slice by slice basis, block by block basis, etc.).

Claims20

Dependent claims

An apparatus comprising:

a video encoder configured to encode an input video signal to generate an output bitstream that is representative of the input video signal, wherein the video encoder further includes:
at least one feedback loop having a sample adaptive offset (SAO) filter and an adaptive loop filter (ALF), wherein the ALF is configured to perform only scaling processing and the ALF is implemented to receive a SAO-filtered output signal from the SAO filter, and wherein:
the ALF is configured selectively to operate on a block by block basis or a slice by slice basis within the video encoder;
the apparatus configured to signal to at least one additional apparatus, which is implemented to receive the output bitstream, which subset of a plurality of blocks or which subset of a plurality of slices associated with the input video signal that have been selectively filtered by the ALF, wherein the at least one additional apparatus is implemented to receive the output bitstream and to decode the output bitstream to recover the input video signal;
and
the ALF configured to perform only scaling processing to perform illumination compensation using at least one gain value to remove at least one amount of quantization noise during encoding of the input video signal to generate the output bitstream having at least one least one quality.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/523,830Filed 14 Jun 2012 · us provisional application
Priority: 27 Sep 2011
Published: US 2013/0077697 A128 Mar 2013
Granted: 30 Aug 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04N 19/82
Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation: involving filtering within a prediction loop
H04N 19/117
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: filters, e.g. for pre-processing or…
H04N 19/147
Data rate or code amount at the encoder output: according to rate distortion criteria
H04N 19/174
The unit being an image region, e.g. an object: the region being a slice, e.g. a line of blocks or a group of blocks