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Advanced screen content coding solution

A technology of screen content encoding and screen content, applied in the field of advanced screen content encoding scheme, can solve the problems of increased computational and storage access complexity of the encoder, limited performance of intra-frame block copy encoding, etc.

Active Publication Date: 2016-07-06
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But the coding performance of intra block copy is limited by its fixed block structure division
On the other hand, the execution of block matching, sometimes similar to motion estimation for intra images, also significantly increases the computational and memory access complexity of the encoder

Method used

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Embodiment Construction

[0028] In the present invention, an advanced screen content coding scheme superior to High-Efficiency Video Coding (HEVC) range extension (eg HEVC version 2 or HEVC Ext) is described. This new scheme includes several algorithms designed specifically for encoding screen content. These algorithms include pixel representations using palettes or color tables, also referred to herein as palette color tables, palette color compression, color index map compression, string search, and residual compression. The technology is evolving in harmony and can be integrated with HEVC Range Extension (RExt) and future HEVC extensions to support efficient on-screen content encoding. But the technique can be implemented with any existing video format. For simplicity, HEVCRExt is used as an example in the following description, and the HEVCRExt software is used to describe and prove the compression efficiency. Using a palette color table and index map, defined here as a palette pattern, the sche...

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Abstract

A method and device for coding screen content into a bitstream by selecting a color palette table for a coding unit (CU) of screen content, creating a color index map having indices for the coding unit (CU), and encoding the selected color palette table and the color index map for the CU into a bitstream.

Description

technical field [0001] The present invention is generally directed to screen content encoding. Background technique [0002] Compared with traditional natural video, screen content coding poses new challenges to video compression technology due to the different signal characteristics. There seem to be several promising techniques for advanced screen content coding, such as pseudo-string matching, palette coding, intra-frame motion compensation, or intra-block copying. [0003] Among these techniques, for lossless encoding, pseudo-string matching has the highest benefit, but has a large complexity overhead and difficulties in lossy encoding modes. Palette encoding is developed for on-screen content based on the assumption that non-camera-captured content often contains finite colors rather than the continuous tone found in natural video. Although the pseudo-string matching and palette encoding methods show great potential, the working draft (WD) version 4 of screen content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/36
CPCH04N19/503H04N19/70H04N19/593H04N19/93H04N19/176H04N19/186H04N19/157H04N19/174G06T9/00H04N1/646H04N2201/0089
Inventor 马展王炜于浩平王显夜静
Owner HUAWEI TECH CO LTD
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