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An adaptive inter-frame fast transcoding method and device from h264 to hevc

A H264, adaptive technology, applied in the field of video encoding and decoding, can solve the problem of high complexity

Active Publication Date: 2018-09-21
高前文
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the decoder and the encoder are independent of each other. Instead of making full use of the information contained in the H.264 code stream after decoding, it traverses all the processes in the encoding, so the complexity is very high.

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Embodiment Construction

[0071] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0072] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0073] Relevant description of the present invention:

[0074] 1. In the H264 structure, the encoded data of a video image is called a frame, a frame consists of one or more slices, a slice consists of one or more macroblocks (MB), and a macroblock consists of 16*16 yuv data composition. Macroblock MB is used as the basic unit of H264 encoding.

[0075] 2. The basic idea of ​​the quadtree index is to recursively divide the space into tree structures of different levels. It divides the space of kno...

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Abstract

The invention relates to the field of video coding and decoding, and particularly relates to an adaptive H264-to-HEVC (High Efficiency Video Coding) inter-frame fast transcoding method and apparatus. Aiming at the problems in the prior art, the invention provides a fast transcoding method and apparatus. Aiming at the inter-frame prediction acceleration problem in the H264-to-HEVC transcoding, the invention discloses a scheme which synthesizes adaptive mode mapping and a motion vector and can carry out reasonable repeated utilization. In an inter-frame prediction stage, a series of quadtree based segmentation are possibly carried out and then CU8s (Coding Units with a size of 8*8) are obtained; the inter-frame prediction is also possibly interrupted in advance, segment of some CUs does not need to extend to the degree of the CU8, some CUs do not need to be segmented to CU16s (Coding Units with a size of 16*16), and the most ideally, the CU64s (Coding Units with a size of 64*64) are directly and integrally coded, wherein CU32, CU16 and CU8 inter-frame prediction all obtains the temporary optimal mode; and after the entire CU64 inter-frame prediction is ended, the optimal coding mode is obtained, and according to the optimal coding mode, coding is carried out.

Description

technical field [0001] The present invention relates to the field of video coding and decoding, in particular to an adaptive inter-frame fast transcoding method and device from H264 to HEVC. Background technique [0002] In recent years, with the rapid development of video services, people's demand for watching high-definition and even ultra-high-definition videos has become higher and higher. The current mainstream video compression coding standard H.264 / AVC can no longer adapt to the network transmission of high-volume video. , so a new generation of video compression coding standard H.265 / HEVC came into being. The main goal of HEVC is to significantly improve the compression efficiency, that is, to reduce the bit rate by about 50% while keeping the video quality basically unchanged, but the computational complexity of encoding has also increased dramatically. [0003] Compared with H.264, HEVC's significant improvement in coding performance is mainly reflected in: (1) A ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/01H04N19/103H04N19/176H04N19/122H04N19/52H04N19/40H04N21/2343H04N21/4402
CPCH04N7/0125H04N19/103H04N19/122H04N19/176H04N19/40H04N19/52H04N21/2343H04N21/4402
Inventor 史方隆刚王标
Owner 高前文
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