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In this paper, a new reversible watermarking method based on ratio expansion for 3D mesh models is proposed. The distances between a vertex and its adjacent vertices are calculated respectively, each of which is then divided by the same reference value to form a series of ratios. Each ratio divided by 2N is multiplied by 10M and then the integer part of it is expanded to embed watermark information...
A novel blind robust 3D mesh object watermarking method is proposed. Firstly, we choose the prongs of the mesh; secondly, to suppose that the prongs are the centers of the circle and the length we choose is the radius, we can get the areas which could be watermarked; and then, with the sphere coordinate, we will get the distance from the object center to the vertices, and perform DFT on the sphere...
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