Design And Research Of 3d Model Information Hiding Algorithm Based On Multi-carrier Fusion State

Information hiding technology is an important means to realize secure communication of secret information.The current study of information hiding technology is based on a single carrier,but constrained by the number of carrier,single carrier algorithm cannot ascend further embedding capacity and security,if will embed the secret information hiding in the multiple carrier,can not only improve embedding capacity,will also reduce the embedded secret information density,improve the information hiding algorithm performance.In addition to the rapid development of image acquisition technology,multi-carrier information hiding is more in line with the practical application of secret communication scenarios.A thesis focuses on the design and research of the information hiding algorithm of the three-dimensional model in the multi-carrier fusion state,mainly on the selection of secret information preprocessing,multi-carrier processing and fusion,embedding rule and embedding area design,and information hiding algorithm.Two kinds of 3D model information hiding algorithms based on multi-carrier fusion state are proposed:(1)Information hiding algorithms based on local feature fusion of 3D models.The main idea of the algorithm is to first preprocess the 3D model carrier set,extract the feature points of the 3D model carrier set,and pre-fuse multiple 3D models;secondly,use an iterative fusion algorithm to perform local feature fusion of multiple carriers;Finally,the local fusion block is edge-folded and meshed,and the structural complexity is defined according to the perimeter of the mesh,and the secret information is embedded by modifying the vertices with high structural complexity.(2)Fusion State Information Hiding Algorithm of 3D Model Based on Aggregation Center Point.The idea of the algorithm is to first extract the 3D skeleton of multiple 3D models by using the distance transformation algorithm to obtain the model skeleton points.According to the Mean Shift clustering analysis algorithm,perform cluster analysis on the skeleton points of the model to obtain multiple aggregation points to obtain the model.The center point of the aggregation point,the aggregation center point is used as the fusion point,and the optimal matching fusion state is obtained through geometric operations;the three-dimensional fusion skeleton is extracted from the fusion state and the skeleton point is obtained,and the expression of the vector is obtained through the three-dimensional vector inscribed sphere expression conversion.The size relationship between the smallest inscribed sphere,sphere radius and threshold at each skeleton point determines the embedded information and the amount of modification to complete the information hiding.A thesis focuses on the research of multiple 3D model carrier groups,and carries out simulation experiments on the proposed information hiding algorithm based on local feature fusion of 3D models.Experimental results show that the robustness test value of the proposed algorithm is improved by 8.634%on average,especially against combined attacks such as rotation compression,and the E~n value of invisibility is improved by 5.236%on average.The other fusion state information hiding algorithm based on the aggregation center point of 3D model improves the BCR value of the robustness index by 16.728%on average compared with the comparison algorithm,and can effectively resist the common attacks such as random noise adding and uneven compression.The average SNR value of invisibility is 11.386 higher than that of the comparison algorithm.The fusion state proposed in this paper is a three-dimensional model information hiding algorithm embedded in a carrier,which provides a new idea for information security research for secret communication,which is of positive significance to the cause of national security.