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HEVC (High Efficiency Video Coding) fast sample point self-adaptive offset method based on dominant edge direction

A sampling point adaptive, edge direction technology, applied in digital video signal modification, electrical components, image communication and other directions, can solve problems such as large amount of calculation

Active Publication Date: 2016-11-16
浙江知多多网络科技有限公司
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  • Description
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Problems solved by technology

[0008] To determine the SAO parameters of a CTU block, it is necessary to traverse 4 kinds of EO mode, BO mode, Merge mode and non-compensation mode, which requires a large amount of calculation

Method used

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  • HEVC (High Efficiency Video Coding) fast sample point self-adaptive offset method based on dominant edge direction
  • HEVC (High Efficiency Video Coding) fast sample point self-adaptive offset method based on dominant edge direction
  • HEVC (High Efficiency Video Coding) fast sample point self-adaptive offset method based on dominant edge direction

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Embodiment Construction

[0053] Taking the encoding process of several sequences such as Basketball Drill as an example, in order to reduce the ringing effect, sample point adaptive compensation needs to be performed on it. Based on this, this embodiment describes the proposed inventive method in detail.

[0054] The steps of the HEVC fast sample point adaptive compensation method based on the main edge direction are as follows:

[0055] Step 1. Extract the main edge direction of each CTU (coding tree unit).

[0056] In order to use the texture information of the image, it is necessary to calculate the sum of the absolute values ​​of the pixel differences of each CTU in different directions, and define the sum of the absolute values ​​as the Dominant Edge Assent (DEA), the candidate main edge direction Including 0°, 45°, 90°, 135° four directions, such as image 3 , and the consistency of the corresponding four directions is denoted as DEA 1 、DEA 2 、DEA 3 、DEA 4 , and take the direction correspon...

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Abstract

The invention discloses a HEVC fast sample point self-adaptive offset method based on a dominant edge direction. The method comprises the following steps: step one, extracting the dominant edge direction of each CTU (coding tree unit); step two, determining an optimal boundary offset mode and a offset value thereof of the CTU; step three, computing a relative ratio distortion cost of other SAO offset way; step four, determining an optimal SAO mode of the CTU. The dominant edge direction of each CTU is extracted as the optimal EO mode of the CTU, and then the optimal mode is judged through the formula Cost=Distortion+lambda*Bitrate after traversing the optimal EO mode, the BO mode, the parameter merge mode, and the non-offset mode. The complexity in the SAO mode determination process is reduced through the adoption of texture information of an image, and the SAO encoding running time of the HEVC is saved.

Description

technical field [0001] The invention belongs to the technical field of high-definition digital video compression encoding and decoding, and in particular relates to an HEVC (High Efficiency Video Coding, High Efficiency Video Coding) fast sample adaptive compensation method based on main edge directions. Background technique [0002] In the rapid development of the digital video application industry chain, in the face of the trend that video applications continue to develop towards high definition, high frame rate, and high compression rate, the limitations of the previous generation of video compression standard protocol H.264 / AVC are constantly highlighted. Therefore, JCTVC, an organization jointly established by the International Telecommunications Organization (ITU) and the Moving Picture Experts Group (MPEG), proposed the next-generation video codec standard - H.265 / HEVC. Its goal is to double the compression ratio of H.264 / AVC under the premise of the same image qualit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/176H04N19/70H04N19/82H04N19/117
CPCH04N19/117H04N19/176H04N19/70H04N19/82
Inventor 贾天婕姚英彪
Owner 浙江知多多网络科技有限公司
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