Abstract
Abstract. High precision 3D sculpture model can take the accurate records of the shape, material and color on the surface of the sculpture. It is an important foundation work of digital documentation, preservation, archaeological research and analysis for the sculpture types of cultural heritage. Constructing high precision 3D sculpture model includes two aspects: geometry modeling and texture reconstruction. But, there are many urgent problems still existing in the method of high precision texture reconstruction. This paper discussed a method of high precision texture reconstruction based on non-rigid transformation for 3D sculpture model. First, coarse registration of texture image to geometrical model is conducted with direct linear transformation (DLT) method. Then, the registration is optimized with thin plane spline (TPS) function to reduce local matching errors between texture image and geometrical model. Finally, texture mapping is implemented with optimized registration result. The experiments based on the sculpture in Dunhuang Mogao Grottoes of China are conducted, and the efficiency and feasibility of the proposed methods are proved.
Highlights
Sculpture is one of the important forms of heritage and exists in great quantity in relics such as temples, towers and grottoes. 3D digitization with high accuracy provides an important mean for the protection of cultural heritage of sculpture, by taking the accurate records of the shape, material and color on the surface of sculpture
The position of 3D model and 2D image can be modeled as pinhole, in which their relationship is defined as perspective centered by the optical center of the camera (Ma Songde, 1998).most of researches on registration of 2D to 3D were focused on the recovery of spatial position of camera on the moment of image capturing, registered them by construction of perspective projection model
This paper proposed a texture mapping method based on nonrigid transformation
Summary
Sculpture is one of the important forms of heritage and exists in great quantity in relics such as temples, towers and grottoes. 3D digitization with high accuracy provides an important mean for the protection of cultural heritage of sculpture, by taking the accurate records of the shape, material and color on the surface of sculpture. 3) Conducting pure 3D registration between 3D model and 3D points generated from aligned stereo images (Deng Fei, 2006; Liu Gang, 2005) Those above methods cannot satisfy the texture mapping of high accuracy, because they employ linear pinhole model to represent perspective projection relationship between 2D image and 3D model. This transformation model is rigid and neglects the lens distortion of camera, the inborn error of laser scanners and accuracy loss in data process. Based on the optimization, which is named nonrigid registration, 2D image can be accurately projected onto the 3D model finish texture mapping This non-rigid registration method can achieve high accuracy globally and locally
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