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Fast intra-frame prediction method based on screen content

A screen content and intra-frame prediction technology, which is applied in digital video signal modification, electrical components, image communication, etc., can solve the problem of less screen content improvement, and achieve the effect of reducing coding complexity

Active Publication Date: 2017-10-20
CHONGQING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

[0005] Compared with the traditional algorithm, the above-mentioned algorithm mainly improves the image with many smooth blocks or pure screen content, but it does not improve the screen content mixed with natural image and screen content.

Method used

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  • Fast intra-frame prediction method based on screen content
  • Fast intra-frame prediction method based on screen content
  • Fast intra-frame prediction method based on screen content

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Experimental program
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Embodiment Construction

[0031] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] (1) Classification of CUs

[0033] Screen content videos often contain a mix of not only computer-generated screen content but also natural content captured by real cameras. In the present invention, NCCU is defined as a natural image CU mainly containing content captured by a camera. SCCUs are defined as complex CUs that primarily contain computer-generated screen content. A PSCU is defined as a completely smooth CU block in screen content. Since the three CUs contain different content, according to the characteristics of the CU content, different mode selection or partition strategies for the three CUs can be considered, thus avoiding exhaustive searches of each CU level and prediction mode.

[0034] The screen content image contains many completely smooth CU blocks with little noise, and their pixel values ​​are completely equa...

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Abstract

The invention relates to a fast intra-frame prediction method based on screen content, belonging to the technical field of multimedia communication. The method comprises a step of dividing CU into three categories which comprise natural content CU, screen content complete smooth CU and screen complex content CU according to encoding unit CU features, a step of selecting traditional 35 intra-frame modes as candidates for the natural content CU, skipping IBC and PLT modes, a step of selecting a DC mode, a Planar mode, a horizontal angle mode and a vertical angle mode as candidate modes for the screen content complete smooth CU, and skipping the IBC mode and stopping the division of quadtree, and a step of judging whether to skip the traditional intra-frame modes through IBC prediction and through spatial correlation for the screen complex content CU. According to the method, through the respective mode selection and division of different types of CU blocks, the encoding complexity is greatly reduced under the condition that video quality is almost unchanged.

Description

technical field [0001] The invention belongs to the technical field of multimedia communication, and relates to a fast algorithm for intra-frame prediction of screen content video. Background technique [0002] With the wide application of screen sharing, remote desktop, animation storage, streaming media and online education, and people's pursuit of high-definition video, how to make screen content video on computer screens, mobile phone screens and other terminals at low bit rates High-definition or ultra-high-definition display has attracted extensive attention from researchers in academia and industry. Screen content videos often contain many static backgrounds, or some moving computer pictures, documents, etc. Compared with the natural content captured by the camera, it has less sensor noise, a large number of smooth areas, high saturation, more repetitive blocks, and generally its content has only a few colors, while Not as rich as natural images. [0003] In March ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/11H04N19/147
Inventor 黄胜成放司朋涛李秋俊
Owner CHONGQING UNIV OF POSTS & TELECOMM
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