| Summary: | 碩士 === 逢甲大學 === 資訊電機工程碩士在職學位學程 === 107 === The purpose of the study is to design a zero-watermarking scheme for protecting copyright of 3D mesh objects. Owing to advance in technology, 3D models are commonly used in multiple fields such as healthcare, filmdom, interactive entertainment, and construction industry. In order to avoid the dangers of copying and using them without authentication, a novel zero-watermarking method based on the transformation of spherical coordinate and skewness of angle statistic is proposed. The main challenge is the robust feature selection and construction of the watermark. The skewness measure of the spherical angle is used to be the resilient feature. Experimental results display the robustness of the proposed scheme during common attacks such as translation, vertex reordering, uniform scaling, noise addition, smoothing, simplification, and cropping. This has demonstrated that the new method is suitable for the applications of the fields which need highly accurate 3D models.
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