The theory and technology of 3D reconstruction is one of the most important hot issues in computer vision. 3D reconstruction based on a single image is difficult to achieve the expected effect due to the lack of sufficient geometric information. In view of the symmetry characteristics of most objects, this paper proposes to use an imaginary symmetry plane, based on the principle of inverse perspective transformation, to manually specify the image coordinates and spatial coordinates of three known pairs of symmetric points to determine the perspective transformation matrix, and then inversely calculate the spatial position of the feature points on the surface of the object, and then use UG software to achieve the reconstruction of the 3D model. Keywords: symmetric objects, viewpoint position, perspective inverse transformation, inverse 3D coordinates Inverse of 3D from Image Point Based On Projection Inverse Transformation YU Chang-hui, YU Yong-yan (Huaiyin Institute of Technology, Jiangsu Huaian 223003) Abstract: The theories and techniques of 3D Reconstruction are one of the most important problems in the computer vision, Single-image-based 3D Reconstruction because of lacking enough several informations but hard attain to expect the result. This paper aims at the symmetry characteristic of most objects, putting forward make use of to imagine the symmetry flat surface according to Projection Inverse Transformation principle, handing over from the artificial to specify with each other to have already known that three picture that rightnesses are a little bit symmetries sit the mark and spaces to sit to mark the Projection Inverse Transformation matrix, Inverse the 3D position that the object surface characteristic order, then make use of the software of UG to carry out 3D models. Keywords: object, View position, Projection Inverse Transformation, Inverse of 3D
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