H.264_advanced video coding (AVC)-video-stream-integrity-based fragile watermark authentication method

Abstract

The embodiment of the invention discloses an H.264_advanced video coding (AVC)-video-stream-integrity-based fragile watermark authentication method, which comprises the following steps of: replacing a corresponding codeword by adopting adaptive variable length coding and exponential Golomb coding in an H.264_AVC compressed bit stream to embed watermark information; resolving the H.264 slice-level compressed bit stream, and performing decoding to generate a feature code according to a key; resolving a macro block-level bit stream and extracting watermark; and performing integrity authentication on a video frame according to the decrypted feature code and the extracted watermark. By the method, the watermark is embedded and extracted based on the compressed bit stream, so the method is low in computational complexity and relatively more practical; after the watermark is embedded, the length of the codeword is unchanged, and video distortion is relatively lower; and the rapid extraction of the watermark can be realized, and the requirements of real-time video processing can be met.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for authenticating a fragile watermark based on the integrity of an H.264_AVC video stream. Background technique [0002] With the rapid development of multimedia network technology, the exchange of digital multimedia information, especially video information, has reached an unprecedented level. However, video information is extremely vulnerable to various unintentional or intentional tampering attacks during transmission, which makes people doubt the integrity of video information and the authenticity of content. If tampering involves important content such as national security and court evidence, it may cause serious consequences. Therefore, how to effectively protect the authenticity and integrity of video information content in the network environment has become a research hotspot in the field of multimedia information security in recent years. As a secure co...

AI Technical Summary

Problems solved by technology

However, the high-efficiency compression performance of H.264 makes it very sensitive to small changes in the coded bit stream, which makes it very difficult and challenging to implement watermarking based on the H.264 code stream domain

In the existing technology, the watermark is embedded by modifying the video stream of the intra-frame 16×16 encoding mode. This scheme has good imperceptibility and small bit rate changes. However, in the actual encoding process, this type of macroblock is relatively rare. , the watermark capacity is relatively small

At present, through statistical analysis of video sequences, the CAVLC (Context-Adaptive Variable Length Coding) code space is divided into two groups: commonly used code space and unused code space, and then according to the bits to be embedded and the code space The mapping relation embedded in the watermark, this scheme also has good imperceptibility, and the embedding capacity is relatively large, but the mapping regulation must be established by statistical analysis of the video sequence, and it has a great impact on the bit rate

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