Semi-fragile watermark has wider applicability

as it can distinguish malicious tampering and normal mesh processing. Most present algorithms can only tolerate a few types of normal mesh processing. A novel semi-fragile watermarking algorithm based on mesh content is proposed. In this algorithm

mesh is partitioned into some sub-meshes

and semi-fragile watermarks are hidden in DCT coefficients of each sub-mesh. When mesh is tampered

the position occurred can be located by matching the extracted watermark sequence and original watermark sequence. Experimental results show that the proposed algorithm can tolerate various mesh normal processing

such as mesh RST similar transforming

and quantization of vertex coordinates with low intensity

while is sensitive to malicious tampering. The proposed algorithm can also locate the tamering positions with relatively high precision.