Multi-carrier information hiding method and system based on three-dimensional model vertex partition

Abstract

The invention discloses a multi-carrier information hiding method and system based on three-dimensional model vertex partition, and the method comprises the steps: transforming each three-dimensional model into a geometric invariant space, and enabling the three-dimensional model to have affine invariance; adjusting normal vector directions of intersection points of inscribed polyhedrons of the central three-dimensional model and intersection points of circumscribed balls of other models to enable normal vectors at the intersection points to be perpendicular, combining the plurality of models to form a multi-carrier fusion state, embedding secret information into a fusion state carrier composed of the plurality of three-dimensional models to form a fusion state carrier; dividing vertexes of a fusion state model into a feature point set according to root-mean-square curvature values, and hiding secret information by changing polar coordinate values of the feature vertexes in a fan-shaped partition. Compared with a three-dimensional model information hidding algorthm based on a single-carrier point cloud model vortex norm, redundant embedding implemented in a large-capacity embedding environment constructed by using multiple carriers enables robustness to be obviously improved, affine transformation attacks can be resisted, and three-dimensional model vertex attacks of simplification, shearing and the like can be reduced.

Description

technical field [0001] The invention belongs to the technical field of reversible information hiding in airspace, and in particular relates to a multi-carrier information hiding method and system based on vertex partitioning of a three-dimensional model. Background technique [0002] At present, with the rapid development of computer networks and the popularization of the Internet, digital multimedia is widely used in daily life, and people communicate through the network by transmitting text, images, videos and other information. But at the same time, due to the strong portability and easy dissemination of digital information, there are more and more attacks on computer files and networks. Attackers steal important confidential information without authorization, which makes multimedia communication a major security risk. Therefore, the security problem of secret information transmission needs to be solved urgently. [0003] Secret information transmission based on informat...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-carrier information hiding method and system based on 3D model vertex partitions, so as to overcome the problems of poor robustness, weak anti-rotation geometric attack ability and poor visibility of existing information hiding methods

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