Extracting projective structure from single perspective views of 3D point sets

applied to this structure which is seen by a single view. The location and orientation of the plane mirror must be known. They are estimated easily as the mirror is xed relative to a calibration block. Due to limitation of the geometry, only a fraction of an object and its corresponding image in a plane mirror can be simultaneously visible in a single view. This fraction is usually less than 1/2. In order to reconstruct a large part of the object, two approaches may be used. Two or more mirrors may be placed at diierent orientations and locations to provide more planes of symmetry of the object with its mirror images. All these can be seen in a single view and the reconstruction will be done for each plane of symmetry. Combining the results, a large part of the object can be reconstructed. In the second approach, a single xed mirror is used. The target object can be placed on a rotary table. Several views with the object rotated are necessary to reconstruct a large part of the object. These two approaches will be attempted in the near future. References 1] Z. Y. Chen, Calibration of an active vision system and feature tracking based on 8-point projective invariants, A new technique for fully autonomous and eecient 3D robotics hand/eye calibration,IEEE Transections Robotics Automation (Vol.