Comput Methods Programs Biomed - An enhanced method for registration of dental surfaces partially scanned by a 3D dental laser scanning.

Tópicos

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Resumo

In this paper, we propose the fast and accurate registration method of partially scanned dental surfaces in a 3D dental laser scanning. To overcome the multiple point correspondence problems of conventional surface registration methods, we propose the novel depth map-based registration method to register 3D surface models. First, we convert a partially scanned 3D dental surface into a 2D image by generating the 2D depth map image of the surface model by applying a 3D rigid transformation into this model. Then, the image-based registration method using 2D depth map images accurately estimates the initial transformation between two consequently acquired surface models. To further increase the computational efficiency, we decompose the 3D rigid transformation into out-of-plane (i.e. x-, y-rotation, and z-translation) and in-plane (i.e. x-, y-translation, and z-rotation) transformations. For the in-plane transformation, we accelerate the transformation process by transforming the 2D depth map image instead of transforming the 3D surface model. For the more accurate registration of 3D surface models, we enhance iterative closest point (ICP) method for the subsequent fine registration. Our initial depth map-based registration well aligns each surface model. Therefore, our subsequent ICP method can accurately register two surface models since it is highly probable that the closest point pairs are the exact corresponding point pairs. The experimental results demonstrated that our method accurately registered partially scanned dental surfaces. Regarding the computational performance, our method delivered about 1.5 times faster registration than the conventional method. Our method can be successfully applied to the accurate reconstruction of 3D dental objects for orthodontic and prosthodontic treatment.

Resumo Limpo

paper propos fast accur registr method partial scan dental surfac d dental laser scan overcom multipl point correspond problem convent surfac registr method propos novel depth mapbas registr method regist d surfac model first convert partial scan d dental surfac d imag generat d depth map imag surfac model appli d rigid transform model imagebas registr method use d depth map imag accur estim initi transform two consequ acquir surfac model increas comput effici decompos d rigid transform outofplan ie x yrotat ztranslat inplan ie x ytranslat zrotat transform inplan transform acceler transform process transform d depth map imag instead transform d surfac model accur registr d surfac model enhanc iter closest point icp method subsequ fine registr initi depth mapbas registr well align surfac model therefor subsequ icp method can accur regist two surfac model sinc high probabl closest point pair exact correspond point pair experiment result demonstr method accur regist partial scan dental surfac regard comput perform method deliv time faster registr convent method method can success appli accur reconstruct d dental object orthodont prosthodont treatment

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