Two-step calibration 3D reconstruction algorithm based on a single image

Two-step calibration reconstruction algorithm is proposed based on binding basic elements and the calibration objects. This method first according to basic elements of building recovery its 3D coordinates of six (or more) points in a single image, then through the 2D and 3D coordinates of these points obtain camera projective matrix, whole building is reconstructed finally. White-Clothing Pavilion reconstruction as example is provided to illustrate the efficiency.