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Region of interest-based H. 265 video quality improvement method

A technology of video quality and area of ​​interest, which is applied in the field of H.265 video quality improvement based on area of ​​interest, can solve the problem of not being able to obtain subjective visual experience, and achieve improved subjective video quality, smooth visual quality, and peak signal-to-noise ratio. Effect

Inactive Publication Date: 2017-04-26
金华就约我吧网络科技有限公司
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Problems solved by technology

In these two cases, the rate control algorithm based on the linear R-λ model cannot obtain the best subjective visual experience.

Method used

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  • Region of interest-based H. 265 video quality improvement method
  • Region of interest-based H. 265 video quality improvement method
  • Region of interest-based H. 265 video quality improvement method

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Embodiment Construction

[0051] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This embodiment is carried out 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.

[0052] Such as figure 1 As shown, the H.265 video quality improvement method based on the region of interest, the steps are as follows:

[0053] 1) Initialize rate-related parameters: R-λ mode rate control initial quantization parameter QP equation is as follows:

[0054] λ=α·R β (1)

[0055] QP=4.2005lnλ+13.7122 (2)

[0056] Wherein α and β are parameters related to the video source, R is the target code rate value, λ is the rate-distortion Lagrangian operator, and formula (2) is to obtain the initial quantization parameter;

[0057] 2) Fusion of spatial domain saliency map components S based on co...

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Abstract

The present invention discloses a region of interest-based H. 265 video quality improvement method. The objective of the invention is to improve subjective visual quality and maintain bit rate control accuracy. According to the method of the invention, a new graph-based saliency model is put forward; the region of interest of a current frame is estimated through a time-space domain saliency graph, so that the region of interest (ROI) can be determined, and frame-level and largest coded macroblock (LCU)-level bit allocation are guided; and for the problem of video quality smoothing, the adjustment of lambda values and QP values in the space domain and the time domain is restricted respectively. As indicated by experimental results, the algorithm can make an output bit rate reach a target value, and improve the peak area signal-to-noise ratio (PSNR) of the region of interest (ROI) of a video frame, and therefore, the overall subjective visual quality of a coded sequence is greatly increased compared with that obtained by using a bit rate control algorithm in the HM10.0 standards.

Description

technical field [0001] The invention belongs to the field of video encoding and decoding, and relates to an H.265 video quality improvement method based on an area of ​​interest. Background technique [0002] The H.265 video codec standard is the latest video codec standard (JCT-VC) jointly launched by the standardization organization of the ITU-T Video Coding Experts Group (VCEG) and the ISO / IEC Moving Picture Experts Group (MPEG). The H.265 standard is still based on the traditional hybrid video coding concept based on block-based motion compensation, but a lot of improvements and innovations have been made in the algorithm. Compared with the previous standards, such as the introduction of 64x64 super macroblocks and quadtree Encoding structure and more complete encoding post-processing modules, such as SAO. H.265 significantly improves the coding efficiency. Compared with 264, the video coding effect is in the case of the same image quality (PSNR), and the bit rate is sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/154H04N19/19H04N19/167H04N19/184
CPCH04N19/154H04N19/167H04N19/184H04N19/19
Inventor 周建政俞骊珠孙俊杰黄金海廉琪
Owner 金华就约我吧网络科技有限公司
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