3D mesh models are high sensitive to the magnitude of their embedding watermarks

and most watermarking algorithms only use low-magnitude embedding method to avoid serious distortion of visual-effect

but unfortunately

it would degrade robustness. In order to compromise the robustness and the transparency of watermarked 3D meshes

a zero-watermarking algorithm that modified nothing of 3D mesh data is presented. After calibrating mesh geometric data

mesh vertices are divided into some blocks according to their bounding-box

and then apply 3D-DCT to integrate the energy in transformed domain. Watermarking signals are constructed by some bigger DCT coefficients and registered in the database of IPR to obtain copyright protection. Original 3D mesh data are not needed when detecting watermark. Experimental results show the watermark constructed by presented algorithm can resist vertex reordering

translating

rotating

uniformed scaling

and show robustness against adding noise

mesh simplifying

mesh filtering

and adding a secondary watermark.