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Geometry transformation-based adaptive loop filtering

A geometric transformation and filter technology, applied in the field of adaptive loop filtering based on geometric transformation, can solve problems such as indistinguishable

Active Publication Date: 2019-03-15
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in cases where the video blocks in a video unit do not have any apparent direction but have a gradual change along the row, or when the video blocks have smooth regions and the pixels within the video blocks have fairly similar sample values, in the current Indistinguishable in ALF or GALF design

Method used

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  • Geometry transformation-based adaptive loop filtering
  • Geometry transformation-based adaptive loop filtering
  • Geometry transformation-based adaptive loop filtering

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Embodiment Construction

[0045] Certain aspects and embodiments of the invention are provided below. For example, various aspects related to the enhancement of ALF and GALF are described, including extended geometric transformations, more flexible use of multiple filter support, and improvements to chroma filters. These enhancements of ALF and GALF are intended to provide coding gains in the context of advanced video codecs, such as extensions to HEVC or next-generation video coding standards. Some of these aspects can be applied individually and some of them can be applied in combination, as will be apparent to those skilled in the art. In the following description, for purposes of explanation, specific details are set forth in order to provide a thorough understanding of the present invention. One of ordinary skill in the art will understand that various aspects of the proposed ALF and GALF techniques described in this disclosure may be practiced without these specific details. For example, circui...

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Abstract

The present disclosure provides various techniques related to adaptive loop filtering (ALF), and particular to geometry transformation-based ALF (GALF). In an aspect, a method for decoding video dataincludes receiving an encoded bitstream having coded video data from which reconstructed video units are generated, identifying multiple filter supports for the reconstructed video units, and filtering the reconstructed video units using the respective multiple filter supports to produce a decoded video output. Another method includes enabling block-level control of ALF of chroma components for the reconstructed video units, performing, for the reconstructed video units, the block-level ALF for the chroma components when ALF is enabled for one video block and skip performing the block-level ALF for the chroma components when ALF is disabled for another video block, and generating, based on the enabled block-level control of ALF, a decoded video output. Related devices, means, and computer-readable medium are also described.

Description

[0001] Cross References to Related Applications [0002] This patent application asserts U.S. Nonprovisional Application No. 15 / 665,492, filed August 1, 2017, entitled "GEOMETRY TRANSFORMATION-BASED ADAPTIVE LOOP FILTERING" and filed August 2, 2016, entitled "GEOMETRY TRANSFORMATION-BASED BASED ADAPTIVE LOOP FILTERING" of U.S. Provisional Application No. 62 / 370,179, which is assigned to the assignee of the present invention and is hereby expressly incorporated by reference herein for all purposes . Background technique [0003] This disclosure relates to various techniques related to Adaptive Loop Filters (ALFs), and more particularly to improvements to Geometric Transformation-based ALFs (GALFs) in the context of advanced video codecs. [0004] ALF for image / video coding has attracted a lot of attention because it can provide improvements in coding performance. ALF is used to minimize the mean squared error (eg, distortion) between original samples and decoded samples by u...

Claims

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Application Information

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IPC IPC(8): H04N19/117H04N19/176H04N19/186H04N19/82H04N19/136H04N19/157
CPCH04N19/176H04N19/136H04N19/186H04N19/157H04N19/117H04N19/82H04N19/122H04N19/147H04N19/18H04N19/17
Inventor 张莉钱威俊赵欣陈义文马尔塔·卡切维奇
Owner QUALCOMM INC
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