US 11,606,580 B2Granted

Sample adaptive offset (SAO) parameter signaling

AssigneeTexas Instruments Incorporated

InventorsVivienne Sze, Madhukar Budagavi, Woo-Shik Kim, Do-Kyoung Kwon, Minhua Zhou

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Abstract

A method for sample adaptive offset (SAO) filtering and SAO parameter signaling in a video encoder is provided that includes determining SAO parameters for largest coding units (LCUs) of a reconstructed picture, wherein the SAO parameters include an indicator of an SAO filter type and a plurality of SAO offsets, applying SAO filtering to the reconstructed picture according to the SAO parameters, and entropy encoding LCU specific SAO information for each LCU of the reconstructed picture in an encoded video bit stream, wherein the entropy encoded LCU specific SAO information for the LCUs is interleaved with entropy encoded data for the LCUs in the encoded video bit stream. Determining SAO parameters may include determining the LCU specific SAO information to be entropy encoded for each LCU according to an SAO prediction protocol.

Claims13

Dependent claims

A system for video processing, the system comprising:

an entropy decoder component configured to decode an entropy encoded bit stream;
an inverse quantization component coupled to the entropy decoder component and configured to perform an inverse quantization function on at least a portion of the decoded bit stream;
an inverse transform component coupled to the inverse quantization component and configured to perform an inverse transform on bit stream data output from the inverse quantization component;
a combiner component coupled to the inverse transform component and configured to combine bit stream data output from the inverse transform component with additional data to form non-overlapping regions of a reconstructed picture;
a deblocking filter component coupled to the combiner component, the deblocking filter component configured to perform deblocking filtering on the non-overlapping regions of the reconstructed picture;
and
a SAO filter component coupled to the deblocking filter component and configured to:
perform SAO filtering on the deblocked non-overlapping regions of the reconstructed picture using SAO parameters extracted from decoded slice data, wherein the SAO parameters for the deblocked non-overlapping regions and data for the deblocked non-overlapping regions are interleaved in the decoded slice data of the decoded bit stream;
and
apply SAO parameters extracted for an immediate left nearest neighbor non-overlapping region to a first non-overlapping region or SAO parameters for extracted for an immediate top nearest neighbor non-overlapping region to a second non-overlapping region when a first merge flag from the decoded slice data is set.

7 more elements

A system for sample adaptive offset (SAO) filtering, the system comprising:

a receiver component configured to receive encoded video data from a communications channel;
a decoder component coupled to the receiver component, the decoder component further comprising:
an entropy decoder component configured to decode an entropy encoded bit stream;
an inverse quantization component coupled to the entropy decoder component and configured to perform an inverse quantization function on at least a portion of the decoded bit stream;
an inverse transform component coupled to the inverse quantization component and configured to perform an inverse transform on bit stream data output from the inverse quantization component;
a combiner component coupled to the inverse transform component and configured to combine bit stream data output from the inverse transform component with additional data to form non-overlapping regions of a reconstructed picture;
a deblocking filter component coupled to the combiner component, the deblocking filter component configured to perform deblocking filtering on the non-overlapping regions of the reconstructed picture;
and
a SAO filter component coupled to the deblocking filter component and configured to:
perform SAO filtering on the non-overlapping regions of the reconstructed picture using SAO parameters extracted from decoded slice data, wherein the SAO parameters for the non-overlapping regions and data for the non-overlapping regions are interleaved in the decoded slice data of the decoded bit stream;
and
apply SAO parameters extracted for an immediate left nearest neighbor non-overlapping region to a first non-overlapping region or SAO parameters extracted for an immediate top nearest neighbor non-overlapping region to a second non-overlapping region when a first merge flag from the decoded slice data is set;
and
a display component coupled to the decoder component and configured to display an SAO filtered reconstructed picture.

11 more elements

A system for sample adaptive offset (SAO) filtering, the system comprising:

a receiver component configured to receive encoded video data;
a decoder component coupled to the receiver component, the decoder component comprising:
an entropy decoder component configured to decode an entropy encoded bit stream;
an inverse quantization component coupled to the entropy decoder component and configured to perform an inverse quantization function on at least a portion of the decoded bit stream;
an inverse transform component coupled to the inverse quantization component and configured to perform an inverse transform on bit stream data output from the inverse quantization component;
a combiner component coupled to the inverse transform component and configured to combine bit stream data output from the inverse transform component with additional data to form non-overlapping regions of a reconstructed picture;
a deblocking filter component coupled to the combiner component, the deblocking filter component configured to perform deblocking filtering on the non-overlapping regions of the reconstructed picture;
and
a SAO filter component coupled to the deblocking filter component and configured to:
perform SAO filtering on the non-overlapping regions of the reconstructed picture using SAO parameters extracted from decoded slice data, wherein the SAO parameters for the non-overlapping regions and data for the non-overlapping regions are interleaved in the decoded slice data of the decoded bit stream;
and
apply SAO parameters extracted for an immediate left nearest neighbor non-overlapping region to a first non-overlapping region or SAO parameters extracted for an immediate top nearest neighbor non-overlapping region to a second non-overlapping region when a first merge flag from the decoded slice data is set, wherein the decoder component comprises multiple processing units with a memory on a common integrated circuit;
and
a display component coupled to the decoder component and configured to display an SAO filtered reconstructed picture.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/243,044Filed 28 Apr 2021 · continuation
Priority: 24 Aug 2011
Published: US 2021/0266606 A126 Aug 2021
Granted: 14 Mar 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04N 19/86
Using pre-processing or post-processing specially adapted for video compression: involving reduction of coding artifacts, e.g. of blockiness
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 19/463
Embedding additional information in the video signal during the compression process: by compressing encoding parameters before transmission
H04N 19/70
Methods or arrangements for coding, decoding, compressing or decompressing digital video signals: characterised by syntax aspects related to video…

Family

Application61/526,931Us provisional application · filed 24 Aug 2011
Application61/577,969Us provisional application · filed 20 Dec 2011
Application13/593,973Parent of this continuation · filed 24 Aug 2012
Application16/056,215Parent of this continuation · filed 6 Aug 2018
US 10,070,152 B2Parent of this continuation · filed 4 Sep 2018
Application16/741,611Parent of this continuation · filed 13 Jan 2020
US 10,536,722 B2Parent of this continuation · filed 14 Jan 2020
US 2021/0266606 A1Pre-grant publication · published 26 Aug 2021
US 11,025,960 B2Parent of this continuation
US 2013/0051454 A1Published application
US 2018/0376168 A1Published application
US 2020/0154146 A1Published application
US 11,606,580 B2This patent

From the US filing history. Foreign family members aren’t listed.