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A Fast Intra-mode Coding Method for HEVC

An intra-frame mode and coding method technology, which is applied in the field of fast intra-frame mode coding and can solve problems such as increased complexity

Active Publication Date: 2022-03-08
HANGZHOU ARCVIDEO TECHNOLOGY CO LTD
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Problems solved by technology

While the finer prediction direction improves the prediction accuracy, the complexity also increases linearly

Method used

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  • A Fast Intra-mode Coding Method for HEVC
  • A Fast Intra-mode Coding Method for HEVC

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Embodiment Construction

[0034] The present invention will be further described below in combination with specific embodiments.

[0035] A fast intra-mode encoding method applicable to HEVC, specifically comprising the steps of:

[0036] (1) For the coding units of P and B frames, first calculate the coding costs of all inter-frame prediction modes (including Skip_2Nx2N&Merge_2Nx2N, Inter_2Nx2N, Inter_2NxN and Inter_Nx2N modes) according to the normal coding process, and select the optimal prediction mode P_best_inter; During the process, both the prediction result and the number of coded bits of the optimal prediction unit are saved. The predicted image of the luminance component of the optimal prediction unit is Prd_best_inter, and the number of coded bits is bits_best_inter.

[0037] (2) Perform 1 / 4 downsampling on both the predicted image of the optimal prediction mode P_best_inter and the original image, and then calculate the SatdCost of the subsampled image in the optimal inter-frame prediction...

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Abstract

The invention discloses a fast intra-frame mode coding method suitable for HEVC. It is divided into two steps: 1. Predict the intra-frame prediction SatdCost on the 1 / 4 downsampled image. The 1 / 4 downsampling is used to reduce the number of pixels and greatly reduce the amount of calculation; if the SatdCost is too high If SatdCost is large, it means that the intra prediction effect is not good, and the calculation of intra prediction is terminated in advance; 2. If the SatdCost in step 1 is not large, the intra prediction cannot be terminated in advance. In this case, use 1 / 4 downsampling The intermediate result obtains the optimal prediction model. The beneficial effect of the invention is that the number of candidate prediction directions can be greatly reduced, the amount of calculation can be further saved, the encoding time can be greatly saved, and at the same time, the loss of encoding quality is also small.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a fast intra-mode coding method suitable for HEVC. Background technique [0002] As the latest generation of video coding standard, HEVC has more than doubled the compression efficiency compared with the previous generation H.264 standard. HEVC adopts many new technologies to improve the compression rate, specifically: (1), HEVC innovatively adopts the quadtree block method, and each block is called a coding unit (Coding Unit, CU) . In order to adapt to the larger resolution of UHD, the maximum CU size is 64x64. A CU can be recursively divided into four sub-CUs, and the smallest CU can be up to 8x8. H.264 uses a macroblock as a basic coding unit, and the size of a macroblock can only be 16x16. Therefore, HEVC's block segmentation method is more flexible than H264, with more types of blocks, which can better match various textures in images. (2), HEVC can try mor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/132H04N19/159H04N19/44H04N19/70
CPCH04N19/132H04N19/159H04N19/44H04N19/70
Inventor 李日朱建国谢亚光
Owner HANGZHOU ARCVIDEO TECHNOLOGY CO LTD