Compressed domain video watermark embedding and extracting method based on visual sensitive block

Abstract

The invention discloses a compressed domain video watermark embedding method based on a visual sensitive block. The method comprises the following steps: scrambling and encrypting a binary watermark sequence to obtain an encrypted binary watermark sequence; obtaining a visual sensitive block of the last frame in each image group GOP of the video, correcting the obtained visual sensitive block by using a video salient region detection method based on a compressed domain to obtain a macro block to be embedded with a watermark; and embedding the encrypted binary watermark sequence into the macroblock according to the first alternating current coefficient of a 4 * 4 sub-macro block located in the first row and the first column in the obtained macro block to be embedded with the watermark, soas to obtain a video embedded with the watermark. According to the method, the technical problem that when the QP value used in the recompression process of an existing video digital watermark embedding method of a compressed domain changes, the embedded watermark is damaged, and therefore quantization attacks cannot be resisted can be solved.

Description

technical field [0001] The invention belongs to the field of multimedia information security, and more specifically relates to a compression domain video watermark embedding and extraction method based on visually sensitive blocks. Background technique [0002] With the development of network technology, information is spreading rapidly with the development of multimedia technology. Some illegal videos are also easy to be copied and illegally disseminated on the Internet. Due to the diversification of different users' needs, the video content will be properly adapted to the needs of different users and devices, so the transmission process will continue to be under the appropriate video compression standard. The video content is re-compressed. At the same time, in the re-compression process, in order to prevent the video content from being illegally manipulated by criminals and protect the copyright of the video content, it is necessary to perform a watermark embedding operat...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for embedding and extracting video watermarks in the compressed domain based on visually sensitive blocks. When the QP value used in changes, the embedded watermark will be destroyed, so it cannot resist the technical problem of quantization attack

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