Mode decision-making method and device for a coding unit

A coding unit and mode technology, applied in the field of video coding, can solve the problems of multi-time, large amount of calculation, increase of coding complexity and coding time, etc., to reduce the time spent, reduce the amount of calculation, reduce the amount of calculation and complexity Effect

Active Publication Date: 2019-03-12
BEIJING QIYI CENTURY SCI & TECH CO LTD
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Problems solved by technology

However, due to the need to calculate the rate-distortion cost in each prediction mode, and the calculation of the rate-distortion cost is relatively large, the mode decision process takes a lot of time, accounting for 60% to 70% of the entire encoding time, greatly increasing Encoding complexity and encoding time

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  • Mode decision-making method and device for a coding unit
  • Mode decision-making method and device for a coding unit
  • Mode decision-making method and device for a coding unit

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Embodiment Construction

[0050] In order to make the above objectives, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] Method embodiment

[0052] Reference figure 1 , Shows a flow chart of the steps of a mode decision method of a coding unit according to an embodiment of the present invention, which may specifically include the following steps:

[0053] Step 101: Perform inter-frame Merge mode decision and inter-frame 2N×2N mode decision respectively on the current coding unit to obtain an optimal coding mode;

[0054] Step 102: Determine the number of non-zero DCT coefficients and the minimum rate-distortion cost corresponding to the optimal coding mode;

[0055] Step 103: When the number of non-zero DCT coefficients and the minimum rate-distortion cost meet the termination decision condition, terminate the mode decision on the curren...

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Abstract

Embodiments of the invention provide a coding unit mode decision method and device. The method comprises: carrying out Merge mode decision and 2N*2N mode decision of a current coding unit to obtain the optimal coding mode; determining the number of non-zero DCT coefficients and the minimum rate-distortion cost corresponding to the optimal coding mode; stopping mode decision of the current coding unit when the number of the non-zero DCT coefficients and the minimum rate-distortion cost satisfy the decision stopping condition. Embodiments of the invention avoid traversal calculation of the rate-distortion cost of all intra modes and inter modes, so that the computation amount required for selection of a prediction mode in the mode decision process is reduced, the computation burden and the complexity in the coding process are further reduced to some extent, and the coding complexity and the coding time are decreased.

Description

Technical field [0001] The present invention relates to the technical field of video coding, in particular to a mode decision method and device for coding units. Background technique [0002] HEVC (High Efficiency Video Coding, high efficiency video coding standard) is a new generation of video coding standard, which can be used to solve people's increasing demand for visual and auditory quality. [0003] In order to improve coding efficiency, HEVC adopts a more flexible coding structure, including CU (Coding Unit, coding unit), PU (Prediction Unit, prediction unit), and TU (Transform unit, transform unit). Among them, CU is the basic unit of HEVC coding, the maximum size of the CU is 64×64, and the minimum size is 4×4. The PU is divided on the basis of the CU to implement the prediction process of the CU. Each CU can be divided into 1, 2, or 4 PUs. The TU is divided on the basis of the CU to implement the transformation process of the CU. Each CU may contain one or more TUs. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/61H04N19/625H04N19/147H04N19/103H04N19/122
CPCH04N19/103H04N19/122H04N19/147H04N19/61H04N19/625
Inventor 朱洪波
Owner BEIJING QIYI CENTURY SCI & TECH CO LTD
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