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A bit rate control method integrating visual perception characteristics

A rate control and visual perception technology, applied in the field of video processing, can solve the problems of ignoring the visual characteristics of the human eye and unsatisfactory bit allocation, achieve the improvement of subjective quality and rate distortion performance, save the number of coding bits, and improve the coding performance. Effect

Active Publication Date: 2020-09-25
BEIJING UNIV OF TECH
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Problems solved by technology

Although the bit allocation method in HM15.0 makes effective use of bit resources, it ignores the visual characteristics of the human eye. For some areas where the human eye pays more attention, the bit allocation is not ideal.

Method used

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  • A bit rate control method integrating visual perception characteristics
  • A bit rate control method integrating visual perception characteristics
  • A bit rate control method integrating visual perception characteristics

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Embodiment Construction

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] In order to improve the subjective quality of video, the present invention considers the impact of brightness and motion intensity on human visual perception, and discloses a HEVC code rate control method that integrates visual perception characteristics. The process is as follows figure 1 As shown, follow the steps below:

[0043] Step 1: Perform GOP layer rate control initialization.

[0044] Step 2: Perform frame layer rate control initialization to determine the current frame f n Whether it is an I frame, if so, then encode an I frame, and then enter the seventh step; if not, then enter the third step.

[0045] Step 3: First, read the current frame f n Luminance component and reference frame f n-1 brightness component. N is the number of LCUs in the current coding frame, Yi (x,y) and Y i '(x, y) are the luminance values ​​of...

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Abstract

The invention discloses a code rate control method fused with a visual perception characteristic. Code rate distribution of an LCU layer is guided according to influence of brightness and exercise intensity to human visual perception, and furthermore, in order to improve rate-distortion performance, a Lagrange multiplier lambda and a quantization parameter QP are corrected on the basis of the visual perception characteristic. According to the technical scheme of the invention, compared with an international coding standard HEVC (HM15.0), the code rate control method fused with the visual perception characteristic has the advantages that code rate control accuracy is not changed basically, subjective quality of a video is improved, rate-distortion performance can be better, bit resources are saved, contradiction between the quality of a video coding reconstructed image and coding resources is relieved, and coding performance of HEVC is improved.

Description

technical field [0001] The invention belongs to the technical field of video processing, and relates to a code rate control method integrating visual perception characteristics. Background technique [0002] With the increasing perfection and wide application of multimedia services, the types of video services have increased sharply, and high-definition video and ultra-high-definition video (4k×2k resolution; 8k×4k resolution) have gradually become popular. The high-efficiency video coding standard HEVC (High Efficiency Video Coding, HEVC) came into being. In order to ensure video quality under the condition of limited channel bandwidth and transmission delay, it is necessary to allocate coding bits reasonably. Therefore, the HEVC standard adopts the rate control technology based on the R-λ model, which is added to the HEVC test model HM15.0. In HM15.0, rate control is carried out in two steps: ① allocate target bits for each coding unit; ② determine quantization parameter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/147H04N19/172H04N19/186H04N19/19H04N19/124H04N19/126
CPCH04N19/124H04N19/126H04N19/147H04N19/172H04N19/186H04N19/19
Inventor 刘鹏宇丰泽琪
Owner BEIJING UNIV OF TECH
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