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Code rate control model updating method based on HEVC standards

A code rate control model and update method technology, applied in the field of video coding rate control, can solve the problems that cannot fully reflect the characteristics of sequence parameters, etc., to achieve enhanced rate control accuracy, accurate rate control effect, and improved rate-distortion performance Effect

Active Publication Date: 2014-07-23
福州视驰科技有限公司
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Problems solved by technology

[0022] But from formula (5), we can see that lambda comp The parameters of the original model were used in the calculation α old and β old , which itself cannot fully reflect the parameter characteristics of the current sequence, so the lambda real and lambda comp The squared error between α and β value, the resulting update model is only approximate to the features of the current video sequence

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  • Code rate control model updating method based on HEVC standards
  • Code rate control model updating method based on HEVC standards
  • Code rate control model updating method based on HEVC standards

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[0034] The present invention is based on the code rate control model update method of the HEVC video coding standard, and according to the characteristics of different video sequences, adaptively adjusts the code rate control model according to the following method α parameters and β parameter:

[0035] Rate Control Model α How to update parameters:

[0036] ;

[0037] Rate Control Model β How to update parameters:

[0038] ;

[0039] in α new for the updated α parameter, β new for the updated β parameter, lambda old based on the target bitrate R acquired original lambda value, R real is the actual code rate after encoding, D ( R real ) represents the video distortion after compression encoding based on the actual bit rate.

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] During the rate control process, the parameter C and K or α = CK and β = - K...

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Abstract

The invention relates to a code rate control model updating method based on HEVC standards. In terms of different video sequence characteristics, the parameter alpha and the parameter beta of a code rate control model are adjusted in a self-adaptive mode according to the following methods including a code rate control model parameter alpha updating method and a code rate control model parameter beta updating method (please see equations in the specification), wherein alphanew is an updated parameter alpha, betanew is an updated parameter beta, lambdaold is an original value lambda obtained on the basis of a target code rate R, Rreal is a coded actual code rate, and D(Rreal) expresses video distortion on the basis of the coded actual code rate. According to the method, model parameters can be precisely updated, and therefore a more accurate code rate control effect can be obtained.

Description

technical field [0001] The present invention relates to the technical field of video coding bit rate control, in particular to a method for updating a bit rate control model based on the H.265 / MPEG-H HEVC (High Efficiency Video Coding) video coding standard. Background technique [0002] In video coding and transmission applications, the new generation of high-performance video coding standard H.265 / MPEG-H HEVC (High Efficiency Video Coding) is a video coding standard established by two international standardization organizations, ISO-IEC / MPEG and ITU-T / VCEG. Developed by the Joint Development Team (JCT-VC), compared with H.264 / AVC, HEVC can reduce the bit rate by half at the same visual quality. [0003] As a new-generation video coding standard, HEVC still belongs to the hybrid coding framework of prediction and transformation. It also includes coding modules such as intra prediction, inter prediction, orthogonal transformation, quantization, filtering, and entropy coding....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/147H04N19/149
Inventor 郑明魁苏凯雄杨秀芝兰诚栋
Owner 福州视驰科技有限公司
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