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HEVC-based audio information embedding method and extraction and reconstruction method

An audio information and audio technology, which is applied in the field of HEVC-based audio information embedding, extraction and reconstruction, can solve the problem that the audio and video synchronization processing effect of high-definition and ultra-high-definition video is not good, and the H.264/AVC standard cannot be satisfactorily compressed. performance issues

Active Publication Date: 2015-11-11
NINGBO UNIV
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Problems solved by technology

[0005] The above methods are mainly for standard-definition video, but with the increase of people's demand for high-definition and ultra-high-definition video, the H.264 / AVC standard can no longer obtain satisfactory compression performance. Poor video sync handling

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  • HEVC-based audio information embedding method and extraction and reconstruction method

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Embodiment Construction

[0039] The present invention will be further described in detail below with reference to the embodiments of the accompanying drawings.

[0040] The present invention provides a method for embedding audio information based on HEVC and a method for extracting and reconstructing audio information based on HEVC. The following is a brief introduction to the HEVC video compression standard:

[0041] The HEVC video compression standard adopts a hybrid coding framework similar to H.264. Intra-frame coding adopts the coding technology based on the quad-tree structure and multi-angle prediction technology. Unlike H.264 / AVC, the HEVC video compression standard uses coding units. CU, prediction unit PU and change unit TU are three more flexible coding elements to describe the entire coding process. The coding unit CU is the basic unit of video coding of each frame. The size of the coding unit CU is recursive in quadtree, and can be divided into 64×64, 32×32, 16×16, and 8×8 according to t...

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Abstract

The invention relates to an HEVC-based audio information embedding method and an extraction and reconstruction method. At the audio information embedding part, an HEVC coding and decoding structure is analyzed; during the intra-frame prediction coding process, a 4*4 prediction unit with the highest texture complexity is selected; the optimal prediction mode is selected by the utilization of the Lagrange rate-distortion model; according to correlation of adjacent prediction modes and under the precondition that the optimal prediction mode is determined, 4 prediction modes having similar prediction effects are classified into one group, and a dynamic double-mapping relation between the prediction mode group and a variable length code group is established; and according to length change of the audio information to be embedded, flag bit is changed, and prediction mode is modulated correspondingly to complete embedding of audio 2-bit or 3-bit information. Therefore, embedding capacity of audio information is greatly raised. During the extraction and reconstruction process, complete and inerrant embedding and extraction of audio information can be realized only by decoding the prediction mode in a code stream according to the double-mapping relation, and subjective and objective quality of audio and video are well guaranteed.

Description

technical field [0001] The present invention relates to an HEVC-based audio information embedding method, extraction and reconstruction method. Background technique [0002] With the development of digital multimedia communication and transmission technology, multimedia services such as video conferencing, distance education, and video-on-demand have been widely used in all aspects of our lives. However, due to the delay, jitter and network congestion in network transmission, and the mismatch between the sending speed of the sender and the receiving speed of the receiver, etc., the multimedia is out of synchronization, and audio and video synchronization is one of the key technologies. more people's attention. In order to solve the problem of audio and video synchronization, there are currently two types of methods, one is a non-embedded audio and video synchronization method, and the other is an embedded method. [0003] The traditional non-embedded audio and video synchr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/96H04N19/122H04N19/46H04N19/109H04N19/19H04N19/147H04N19/176
Inventor 王晓东徐辉王让定蒋刚毅章联军叶庆卫周宇汪朝林王含章陈超
Owner NINGBO UNIV
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