Method for embedding and extracting digital watermarks of three-dimensional point model

Abstract

The invention discloses a method for embedding and extracting digital watermarks in specific to a three-dimensional point model, comprising the steps of: firstly, reconfiguring the coordinates of a model by adopting a principal component analysis method, then, forming a plurality of projected images inside a spherical surface with a gravity as a sphere by using a visual operator and taking the gravity center as a view point, converting a three-dimensional model into a two-dimensional image, regulating a spectrum coefficient of a low-frequency part by applying a two-dimensional frequency domain analysis method, and mapping the low-frequency part back to the three-dimensional model to realize the embedding and the extracting of the watermarks of the three-dimensional point model. In the invention, the calculated amount is moderate, the watermark capacity is large, and the method is suitable for large-scale point models and can be used for resisting various affine transformation attacks, achieving certain robustness to peak reordering, peak resampling and other various attacks, and effectively protecting the copyright of three-dimensional products.

Description

Technical field: [0001] The invention relates to a digital watermark embedding and extraction method for a three-dimensional point model, and is a digital watermark embedding and extraction method especially suitable for authentication of three-dimensional digital products and digital copyright protection. Background technique: [0002] 3D models are used more and more widely in technical fields such as digital entertainment, virtual reality, online games and industrial design. Accurate 3D model generation and processing is very expensive and time-consuming, and producers or copyright owners of these 3D products inevitably face copyright protection, content authentication, content authenticity, usage control when publishing or selling products in virtual space and transmission route tracking and other practical issues. Digital watermarking technology is an effective technology for digital product copyright protection and data security maintenance. It embeds identifiable dig...

AI Technical Summary

Problems solved by technology

Due to the huge workload of building the grid itself, coupled with the huge amount of point model data, the embedding and extraction algorithm of the 3D point model watermark has disadvantages such as large amount of calculation, slow embedding and extraction speed, etc.

[0005] 2) It is difficult to transform the 3D point model into the frequency domain for operation

[0006] 3) The attack processing operations of the 3D point model are various and varied

Some operations do not make any changes to the properties of the 3D model, but seriously affect the detection of watermarks, such as: translation, rotation, uniform / non-uniform scaling, vertex reordering, resampling, etc.

These attack operations bring great difficulties to 3D model watermark detection

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