Arthy RAJAKUMAR, Suresh Babu RAJENDRAN, Mala KALIAPPAN

Hypothesis-based vertex shift method for embedding secret logos in the geometric features of 3D objects

A recent challenge in information technology is to protect secret data and preserve the ownership of a product.There are many duplicate products being released on a daily basis. Owners have a high risk in proving their products.Watermarking is a technique used to preserve ownership by hiding the owner’s information in their products. Theproposed hypothesis-based vertex shifting algorithm embeds 2D secret logos in 3D cover objects. The 3D objects arerepresented using vertices and facets. 3D watermarking faces various challenges and one among them is capacity. In thiswork, capacity is addressed by using a hypothesis-based vertex shift method that enables the embedding process for allthe coordinates of the vertex. The method works by partitioning the vertex based on a shift factor called svalue. Thesvalue is chosen based on the visual quality of the watermarked object. The metrics used for testing are bit error ratefor the recovered watermark, peak-to-signal noise ratio, and vertex signal-to-noise ratio (VSNR) of the watermarked 3Dimage. The proposed algorithm shows that a maximum of 3 bits can be embedded in a vertex when compared with theexisting algorithms. The VSNR value of the proposed algorithm is high (125.87) compared to the existing algorithms.This shows that the algorithm withstands visual quality inspection. Hence, it is a robust watermarking algorithm forembedding secret logos into 3D objects with better visual quality and higher resilience against translation and uniformscaling attacks.

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