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HEVC intra-frame prediction coding method and system

An intra-frame predictive coding and coding technology, which is applied in the field of video coding, can solve the problems of complex calculation, time-consuming HEVC intra-frame predictive coding, etc., and achieve the effect of reducing the number of traversals

Inactive Publication Date: 2014-07-30
ANKE SMART CITY TECH PRC +1
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Problems solved by technology

[0006] The above algorithms optimize the HEVC intra-frame predictive coding at the PU layer and the CU layer respectively. The optimization of the PU layer and the CU layer are independent, and the optimization of the CU layer and the PU layer is not integrated. The calculation is still very complicated. HEVC frame Intra-prediction coding is still time-consuming

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  • HEVC intra-frame prediction coding method and system

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Embodiment 1

[0063] Such as figure 1 As shown, a HEVC intra-frame predictive encoding method provided by an embodiment of the present invention includes:

[0064] S10. Calculate the area smoothness of the current LCU.

[0065] Specifically, each frame of image can be divided into non-overlapping largest coding units LCU, a large CU size is used in a flat area, and a small CU size is used in a detailed area. Based on this, the best reference is itself. As a preprocessing, we take the region smoothness of the current LCU as the first basis for judging whether to segment and whether to skip.

[0066] Preferably, calculating the regional smoothness of the current LCU can be calculated using the following formula:

[0067] RS _ Value = 1 2 N × 2 N Σ i ...

Embodiment 2

[0102] see Figure 5 A HEVC intra-frame predictive coding method provided by a preferred embodiment of the present invention includes:

[0103] S501. Determine whether the current LCU is non-boundary and there are adjacent LCUs, if yes, execute step S508, otherwise execute step S502;

[0104] S502. Calculate the smoothness of the current LCU area, and obtain the coding depth of the reference SCU;

[0105] S503. Determine whether the current LCU smoothness is less than the first preset smoothness threshold, if yes, execute step S507, if not, execute step S504;

[0106] S504. Calculate the similarity with the adjacent LCU;

[0107] S505. Determine the weight of each adjacent LCU according to the similarity value with the adjacent LCU, and determine the depth prediction value of the current LCU according to the weight;

[0108] S506. Determine the depth of the current LCU according to the area smoothness of the current LCU and the similarity with adjacent LCUs.

[0109] S507,...

Embodiment 3

[0112] Figure 6 A block diagram of a HEVC intra-frame predictive coding system provided by an embodiment of the present invention, the system includes:

[0113] The smoothness calculation module 10 is used to calculate the area smoothness of the current LCU.

[0114] Preferably, calculating the regional smoothness of the current LCU can be calculated using the following formula:

[0115] RS _ Value = 1 2 N × 2 N Σ i = 0 stride - 1 | P i - P mean | - - - ( ...

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Abstract

The invention discloses an HEVC intra-frame prediction coding method and system, and belongs to the technical field of the video coding technique. The method comprises the steps that each image frame is segmented into largest coding units (LCUs) which are not overlapped; the area smoothness of a current LCU is calculated; the similarity between the current LCU and an adjacent LCU is calculated; self-adaption depth prediction is performed according to the similarity between the current LCU and the adjacent LCU; the depth of the current LCU is determined according to the smoothness of the current LCU and the similarity between the current LCU and the adjacent LCU, and coding is performed according to the depth of the current LCU. By the adoption of the HEVC intra-frame prediction coding method and system, CU partition is stopped in advance by early stopping prediction or a certain layer of partition is omitted; meanwhile, as the number of intra-frame prediction modes in an RDO process is reduced in a PU layer, a CU layer and the PU layer are optimized and integrated together, implementation complexity can be reduced, and HEVC intra-frame prediction time is greatly shortened.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to an HEVC (High Efficiency Video Coding, High Efficiency Video Coding) intra-frame predictive coding method and system. Background technique [0002] HEVC is a new generation of video compression standard formulated by the International Standards Organization ISO / IEC and ITU-T. Its core goal is to double the compression efficiency on the basis of H.264 / AVC, that is, to ensure the same video image quality. Under the premise, the bit rate of the video stream is reduced by 50%. [0003] HEVC inherits the classic block-based hybrid coding model since H.261. In order to compress high-resolution video more effectively, HEVC proposes three more flexible video content representation units, including: coding unit (CU), prediction unit (PU) and transform unit (transformunit) , TU). CU is similar to the concept of macroblock (macroblock) in H.264. In HEVC, each frame of image...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/159H04N19/593H04N19/30H04N19/176
Inventor 张红广沈芝宸王鹏王正聪宁德军
Owner ANKE SMART CITY TECH PRC
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