Reversible watermarking apparatus of three-dimensional model and method thereof for realizing robustness on similar transformation

Abstract

The invention discloses a reversible watermarking apparatus of a three-dimensional model and a method thereof for realizing a robustness on similar transformation. The method comprises two parts: a watermarking embedding process and a watermarking extraction method. More particularly, according to the method, with regard to each vertex input into a three-dimensional model, similar transformation invariant ratios that are associated with each the vertex are calculated; all the ratios are mapped to a integer interval to generate a histogram; and after the histogram transformation, the watermarking is embedded to the three-dimensional model; and simultaneously, watermarking information is adjusted and then is embedded to coordinate positions of all the vertexes; According to the invention, a histogram can be adjusted by controlling an integer interval range, so that a watermarking embedding capacity and a size of invisibility of an algorithm can be flexibly adjusted; on the premise that there is a low computational complexity, a model to which watermarking has been embedded can be completely restored to an original model during the extraction process of the method provided in the invention; moreover, extracted watermarking information can be utilized for copyright verification.

Description

technical field [0001] The invention relates to a three-dimensional model reversible watermarking device and method robust to similar transformation, in particular to digital watermarking technology, and belongs to the field of three-dimensional grid model graphics processing. Background technique [0002] Digital watermarking is an effective means to solve copyright protection and verification of two-dimensional images, audio, video and three-dimensional models. However, with the embedding of watermarks, the content of these digital products will inevitably undergo permanent changes, even if the changes caused are imperceptible to the human visual system. However, for applications with high precision requirements (such as medical diagnosis, forensic evidence, and artwork preservation, etc.), any alteration is unacceptable, so after the watermark is extracted, these digital products must be restored to their original state. Correspondingly, a reversible watermarking technol...

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Problems solved by technology

Due to its poor invisibility, this method is not suitable for applications that require high invisibility

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