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HEVC code rate control method based on rate-distortion optimization

A rate-distortion optimization and bit rate control technology, applied in the field of video communication, can solve the problems of poor subjective video quality and large visual differences in different areas, achieve good bit rate control performance, small fluctuation of peak signal-to-noise ratio, and improve average Effect of Peak Signal-to-Noise Ratio

Inactive Publication Date: 2016-05-25
XIDIAN UNIV
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Problems solved by technology

In order to obtain better subjective video quality, coding tree unit CTUs with different coding complexities should use different quantization parameters QP, while the method in JCTVC-J0057 uses the same quantization parameter QP coding for all coding tree unit CTUs of a frame, As a result, the visual differences in different areas of the reconstructed image are relatively large, and the subjective quality of the video is relatively poor.

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  • HEVC code rate control method based on rate-distortion optimization
  • HEVC code rate control method based on rate-distortion optimization
  • HEVC code rate control method based on rate-distortion optimization

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Embodiment Construction

[0038] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This embodiment is implemented on the premise of the technical method of the present invention, and detailed implementation and specific operations are given, but the protection scope of the present invention is not limited to the following embodiments.

[0039] refer to figure 1 , the implementation steps of the present invention are as follows:

[0040] Step 1: Read the encoder configuration file and set the encoding parameters.

[0041] Coding parameters include the initial quantization parameter Q in , the size of the image group, the temporal structure of the encoding, the initial value of the i-th image group, and the initial value of the j-th frame in the image group;

[0042] Initial quantization parameter Q in There are two ways to get it: Set the initial quantization parameter Q according to the encoder configuration file in Or set the initi...

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Abstract

The invention discloses an HEVC (High Efficiency Video Coding) rate control method based on rate distortion optimization and mainly aims at solving the problem that the quality of a video reconstructed by the existing rate control method of video coding standards HEVC is poor. The method is realized by the following steps of (1) setting encoder parameters; (2) sequentially reading each image group and carrying out rate control over each frame of each image group; (3), for each frame, calculating the quantitive parameter of the frame and coding if rate control is not needed for a coding tree unit layer, and if rate control is needed, calculating the target bit of the frame and carrying out rate control over the coding tree unit layer; and (4) sequentially calculating the quantitive parameter of each coding tree unit and coding by a quantitive parameter calculating method based on rate distortion optimization and realizing rate control over the coding tree unit layer. The quality of the video reconstructed by the video coding standards HEVC is improved by the method. The method can be used for videos on demand, remote education, telemedicine, video conferences, videophones, stream media and the like.

Description

technical field [0001] The invention belongs to the technical field of video communication, and in particular relates to a code rate control method for the HEVC video coding standard, which can be used for video on demand, distance education, telemedicine, video conference, videophone and streaming media, etc. Background technique [0002] The purpose of bit rate control is to control the size of the output bit stream by controlling the parameters of video encoding, and at the same time obtain better video reconstruction quality as much as possible. In real-time video communication, rate control is an indispensable part of video encoder. In order to meet the needs of rapidly growing video content, the video coding joint group JCT-VC, jointly established by the video expert group of ITU-T and the motion picture expert group of the International Standards Committee ISO, has formulated a new Video coding standard, namely High Efficiency Video Coding HEVC. The encoder configur...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/154H04N19/149H04N19/166H04N19/89
Inventor 吴炜宋彬王杰姬瑞旭
Owner XIDIAN UNIV
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