Embedding and Extraction Method of Mobile Device Video Watermark Based on Block Combination

Abstract

Provided is a mobile device video watermark embedding and extracting method based on block combination, comprising: blocking video frame images waiting for watermark embedding, with 14 4*8 blocks in one set; embedding one bit of information in each set, and stipulating the binary data successively embedded into 14 4*8 blocks according to the embedded bit value of each set; performing texture analysis on each block to determine whether the block is a gray flat region or a gray complex region; performing embedding operation on each set to obtain video frame images embedded with watermarks; blocking the video frame images embedded with watermarks, with 7 4*16 blocks in one set; calculating the number of pixels in each block of each set which have the pixel grey scale of a fifth column greater than the adjacent pixel grey scale of a sixth column, and the number of pixels which have the pixel grey scale of a 13th column greater than the pixel grey scale of a 14th column; determining the data extracted from blocks; and according to the data sum extracted from blocks of each set, finally determining the bit value extracted from each set. The method improves digital watermarking robustness.

Description

Technical field [0001] The invention relates to a watermark embedding and extraction method. In particular, it relates to a method for embedding and extracting video watermarks for mobile devices based on block combination. Background technique [0002] With the rapid development of information technology and mobile Internet, the transmission of digital information has become more and more convenient. A large number of digital multimedia including digital pictures, digital audio, digital video, etc. have appeared one after another, but its content is easily copied and disseminated. It is extremely easy to be illegally pirated and tampered with by pirates to gain profits and seriously infringe the copyright and interests of the original owner of the work. Therefore, the protection of the copyright of digital multimedia works is becoming more and more important, and digital watermarking technology has emerged as a matter of course. Become a hot spot of current research. The so-ca...

AI Technical Summary

Problems solved by technology

The traditional transform domain algorithm is relatively complicated. Since the designed algorithm is applied to mobile devices, watermarks must be embedded in the video while recording video with the device, which may cause unsmooth playback or freezing, so the real-time performance is poor. , but the original space domain algorithm can not meet the robustness requirements of watermarking, it is urgent to propose a new algorithm

[0005] The main challenge currently facing the field of digital watermarking is: the traditional spatial domain video watermarking algorithm is relatively poor in robustness

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