Method for rapidly selecting HEVC prediction mode based on scene switching

A technology of scene switching and prediction mode, which is applied in the field of video coding, can solve problems such as time-consuming and complex algorithms, and achieve the effects of low probability of false detection and missed detection, fast detection, and obvious acceleration effect

Active Publication Date: 2017-02-22
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to solve the algorithm complex and time-consuming defects of the above-mentioned fast mode selection algorithm. Fast mode selection for frame encoding to improve the processing efficiency of encoding

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  • Method for rapidly selecting HEVC prediction mode based on scene switching
  • Method for rapidly selecting HEVC prediction mode based on scene switching
  • Method for rapidly selecting HEVC prediction mode based on scene switching

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Embodiment Construction

[0024] The specific embodiment of the present invention will be further described in detail in conjunction with the accompanying drawings.

[0025] The present invention is based on such a rule in video predictive coding, that is, for non-intra-frame predictive coding units, the predictive coding mode will be selected according to the degree of association between the current coding unit and the previous coding unit; however, if the current coding unit has no connection with the previous coding unit , then after traversal, the intra mode will definitely be selected as the best coding mode. Therefore, for such a coding unit, it may be considered to skip most of the traversal process and directly select the best coding mode in the intra mode. Therefore, a large number of selection calculation processes are reduced, and the coding efficiency is improved. A typical scene-cut frame is a collection of such coding units. The scene switching frame occurs at the junction of two scene...

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Abstract

The invention discloses a method for rapidly selecting a HEVC prediction mode based on scene switching. The method comprises the following steps of: firstly, when an input YUV file is read, recording the brightness component of each frame of image to form a gray-level image; compressing each frame of gray-level image into an index image in the M*M format by utilizing an interpolation method; calculating the average value V<average> of the M*M gray values, and comparing each gray value with the V<average> to obtain a M*M-bit binary fingerprint sequence of each frame of image; for two sequential images, comparing fingerprint sequences thereof, counting the number dNum of different binary values at corresponding positions, and generating a hash index; and, for a current frame of image, the hash index of which is greater than a threshold value T, judging that the current frame is a scene switching frame, setting the current frame to the I frame when the frame type is set, performing predication coding according to the I frame, and otherwise, not performing any operation. By means of the method disclosed by the invention, for the scene switching frame in a video, rapid detection can be carried out; furthermore, other related optimal acceleration algorithms cannot be influenced; and the coding quality cannot be changed. The method disclosed by the invention can be used together with the existing HEVC rapid prediction algorithm.

Description

technical field [0001] The invention belongs to the field of video coding, and relates to a method for realizing fast prediction mode selection by detecting scene switching frames in HEVC standard video coding. Background technique [0002] The latest video codec standard HEVC (High Efficiency Video Coding) has achieved twice the compression efficiency of previous coding standards such as H.264 and MPEG-4 due to the adoption of many new technologies. However, while these new technologies achieve better coding quality in high-resolution video coding, they also greatly increase the coding complexity of HEVC. In order to reduce encoding overhead, reduce encoding time, and meet the needs of encoding applications, various fast encoding algorithms for HEVC have been continuously proposed. [0003] The most distinctive feature of HEVC is that it adopts a quadtree structure. Unlike the relatively simple 16×16 fixed-size macroblock coding unit before, HEVC adopts a four-layer coding...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/107H04N19/142
CPCH04N19/107H04N19/142
Inventor 胡栋浦炜范光宾
Owner NANJING UNIV OF POSTS & TELECOMM
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