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HEVC (High Efficiency Video Coding) fast encoding method

A fast encoding and encoding technology, applied in the field of video encoding, can solve the problems of inability to achieve flexible control of encoding quality and encoding efficiency, limited improvement of encoding efficiency, and complex calculations, so as to reduce the computational complexity of intra-frame prediction and achieve fast intra-frame prediction. , Improve the effect of coding efficiency

Active Publication Date: 2015-01-28
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the calculation of parameters (Sobel operator and MAD, rate-distortion cost sum, etc.) required for early termination of intra-frame CU partition by these algorithms is relatively complicated, and the improvement of coding efficiency is limited; Flexible Control of Efficiency

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  • HEVC (High Efficiency Video Coding) fast encoding method
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  • HEVC (High Efficiency Video Coding) fast encoding method

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Embodiment Construction

[0032] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0033] The present invention aims at the deficiency that intra-frame CU division consumes a large amount of computing time and resources in the existing standard HEVC encoding technology, improves the intra-frame CU division process, and uses the standard deviation (SD) of the pixel value in the coding unit as the early termination of division The parameters of CU blocks of 64×64, 32×32, and 16×16 are respectively set with an SD threshold in advance. During the division process, when the SD value of the current CU is smaller than the corresponding SD threshold, the The CU division is terminated, so that the time consumption of intra-frame CU division is effectively improved, and the coding efficiency is improved. The present invention further uses a statistical method to pre-obtain the relationship between PSNR, code rate, operation time and the three S...

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Abstract

The invention discloses an HEVC fast encoding method improving an intra-frame CU (Code Unit) division process for the consumption of a lot of time and resources of intra-frame division CU in the prior standard HEVC encoding art. The HEVC fast encoding method includes the steps of using the standard difference (SD) of pixel values in an encoding unit as a division early termination parameter, presetting an SD threshold value for CU blocks in three sizes of 64*64, 32*32 and 16*16 respectively, and terminating CU division early when the SD value of the current CU is smaller than the corresponding SD threshold. Therefore, the time of the intra-frame CU can be consumed effectively and accordingly the encoding efficiency is improved. The HEVC fast encoding method further uses statistical methods to obtain the relationship between the PSNR (Peak Signal to Noise Ratio), code rate and operation consuming time with the three SD threshold values in advance so as to achieve flexible encoding quality control by selecting the appropriate SD threshold according to the actual encoding quality requirements.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a HEVC (High Efficiency Video Coding) fast coding method. Background technique [0002] As a new generation video standard, HEVC was proposed in the JCT-VC meeting held in Dresden, Germany in April 2010, and the test model HM2.0 was proposed at the same time. Its core goal is to double the compression efficiency on the basis of H.264 / AVC High Profile, that is, to ensure that the bit rate of the video stream is reduced by 50% under the premise of the same video image quality. HEVC follows the core mechanism of H.264 / AVC and adopts a variety of encoding techniques to significantly improve encoding performance. These include intra-frame prediction technology, using a more flexible quadtree coding unit structure. HEVC intra prediction uses CU (Code Unit), PU (Prediction Unit) and TU (Transform Unit) for encoding, prediction and transformation operations. The size of t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/122H04N19/13H04N19/147
Inventor 胡栋朱惟妙徐秋萍葛庆阳
Owner NANJING UNIV OF POSTS & TELECOMM
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