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Method based on Coding Tree Unit (CTU) Level Rate-Distortion Optimization for Rate Control in Video Coding

一种编码树单元、视频编码的技术，应用在编码树单元的码率控制领域，能够解决编码效率不高、没有考虑感知质量等问题

Active Publication Date: 2020-01-24
TFI DIGITAL MEDIA LTD
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Problems solved by technology

However, these methods are based on the mean square error (MSE) during encoding optimization, without considering the perceptual quality, so the encoding efficiency is not high

Method used

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  • Method based on Coding Tree Unit (CTU) Level Rate-Distortion Optimization for Rate Control in Video Coding
  • Method based on Coding Tree Unit (CTU) Level Rate-Distortion Optimization for Rate Control in Video Coding
  • Method based on Coding Tree Unit (CTU) Level Rate-Distortion Optimization for Rate Control in Video Coding

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Embodiment Construction

[0033] In the following description, a method and an apparatus for rate control (RC) of video coding that optimize distortion at the Coding Tree Unit (CTU) level are elaborated. It is obvious to those skilled in the art that modifications including additions and / or substitutions can be made without departing from the scope of the present invention. Specific details may be omitted to avoid obscuring the invention; this disclosure has been written to provide useful guidance to those skilled in the art.

[0034] On the one hand, the present invention can be used in figure 1 The illustrated video encoding system 100 is implemented. System 100 may include modules. A "module" may include software, hardware, or a combination thereof, where software may be machine code, firmware, embedded code, and application software. Hardware can be a circuit, processor, computer, integrated circuit, integrated circuit core, passive device, or a combination thereof. Such as figure 1 As shown...

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Abstract

A method based on CTU level rate-distortion optimization for rate control in video coding which can effectively improve the perceptual rate-distortion performance and coding efficiency is provided. Firstly, a perceptual rate-distortion model is established using a divisive normalization framework, which characterizes the relationship between local visual quality and coding bits. Subsequently, theestablished perceptual rate-distortion model is applied to overall distortion optimization which is transformed into a global optimization problem and solved with convex optimization algorithms to obtain optimal CTU level coding bit allocation. It is shown in experimental results that the algorithms can effectively increase encoding performance and efficiency.

Description

technical field [0001] The invention relates to the field of code rate control in video coding, in particular to a code rate control method for coding tree units. Background technique [0002] Recently, rate control (RC) optimization methods in High Efficiency Video Coding (HEVC) have been proposed one after another. There are three types of RC algorithms in HEVC: quadratic model [1], ρ-domain model [2] and R-λ model. Li et al. first proposed a λ domain RC optimization method based on the relationship between the code rate and the Lagrangian multiplier in [3]. Due to the low complexity and high efficiency of this method, this model is adopted as the default RC model in the HEVC reference software. Lee et al. used the Laplace probability distribution function (PDF) to model the residual in the literature [4], and proposed the corresponding R-Q model to establish the relationship between the quantization parameter and the coding rate. Rate includes texture and non-texture b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/147H04N19/44H04N19/625H04N19/70
CPCH04N19/147H04N19/625H04N19/70H04N19/44H04N19/96H04N19/19H04N19/119H04N19/176Y02T10/40
Inventor 周明亮王诗淇邝得互冯志强黄汉华陆瀚东张学坤袁耀辉
Owner TFI DIGITAL MEDIA LTD
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