Producing method and extraction method of fragile watermarks of three-dimensional model with robustness

Abstract

The invention discloses a producing method and an extraction method of fragile watermarks of a three-dimensional model with robustness. The producing method includes: 1) partitioning and scrambling original binary watermark images; 2) manufacturing sorted vertex sequences for embedding in the watermark images; 3) generating novel binary watermarks and novel hashed value blocks; and 4) embedding the novel binary watermarks and the novel hashed value blocks in the vertex sequences respectively, and obtain the three-dimensional model with embedded watermark images. The extraction method comprises: 1) judging whether the watermarks are imbedded in vertexes; 2) obtaining binary watermarks with inserted 0 and corresponding hashed values when the watermarks are embedded; 3) judging suspicious vertexes; 4) obtaining the scrambled binary watermark images during embedding; and 5) performing anti-scrambling on the obtained scrambled binary watermark images, and finishing extraction of the binary watermark images. The producing method and the extraction method of fragile watermarks of the three-dimensional model with the robustness are free of blocking effect and good in robustness, can detect any change of the model during extraction, and can locate tampered areas.

Description

technical field [0001] The invention relates to the technical field of video image information security, in particular to a robust three-dimensional model fragile watermark generation method and an extraction method thereof. Background technique [0002] In recent years, domestic and foreign achievements related to digital watermarking are increasing day by day. Since the Japanese Ohbuchi first proposed the 3D model watermarking technology in 1997, the research on the 3D model digital watermarking technology has been greatly developed. However, most of the current papers are on robust digital watermarking, and only a few results are on fragile watermarking algorithms for 3D model integrity verification. In fact, the first paper on fragile watermarking algorithms for 3D model integrity verification is Yeo and Yeung proposed. Fornaro and Sanna proposed a 3D public key fragile watermarking algorithm based on the CSG model by referring to the method of 2D fragile watermarking....

AI Technical Summary

Problems solved by technology

[0003] Since the watermark information for Hash processing and the information bit for storing the Hash function value have only one bit, this leads to the fact that the Hash function used in some achievements can only be h(w i )=w i , h(w i ) = 0.5w i Wait for some simple Hash functions, it is easy to guess their Hash values ​​for these simple Hash functions, and it is easy to attack them

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