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

Abstract

The invention relates to an HEVC-based audio information embedding method and an extraction and reconstruction method. In the audio information embedding part, the HEVC encoding and decoding structure is divided, and in the intra-frame predictive encoding process, a 4×4 image with high texture complexity is selected. The prediction unit uses the Lagrangian rate-distortion model to select the optimal prediction mode, and according to the correlation of adjacent prediction modes, on the premise that the optimal prediction mode is determined, the four prediction modes with similar prediction effects are divided into one group , establish a dynamic double-mapping relationship between the prediction mode group and the variable-length code group, change the flag bit according to the length of the audio information to be embedded, and corresponding to the modulation prediction mode, complete the embedding of audio 2-bit or 3-bit information, which greatly improves the The capacity of embedded audio information. In the extraction and reconstruction process, it is only necessary to decode the prediction mode in the code stream according to the double mapping relationship, realizing the complete and error-free embedding and extraction of audio information, and ensuring the subjective and objective quality of audio and video.

Description

technical field [0001] The invention relates to an HEVC-based audio information embedding method and an extraction and reconstruction method. Background technique [0002] With the development of digital multimedia communication and transmission technology, multimedia services such as video conferencing, distance learning, 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, as well as the mismatch between the sending speed of the sending end and the receiving speed of the receiving end, the multimedia is out of sync, and audio and video synchronization, as a key technology, is becoming more and more more people's attention. In order to solve the audio and video synchronization problem, 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 vi...

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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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