Multiple base-angle rotational stereo for accurate 3D model reconstruction

A rotational stereo technique for 3D model reconstruction is presented. It uses stereo images acquired with multiple base-angles to increase both precision and accuracy of 3D shape. This technique is motivated by its application in camera systems for reconstructing complete (360 degree view) 3D model of objects. The object whose 3D model is to be reconstructed is placed on a rotation stage. Multiple base-angle images are recorded using a single camera by rotating the stage by different angles. This rotational stereo technique is a special case of general vergence stereo, and offers several advantages. It uses a single camera instead of two, easier to calibrate, and offers flexibility in the number and values of base-angles. A multiresolution stereo matching algorithm is used to improve the time efficiency and reduce false matches. The technique has been implemented on a low-cost digital camera system. Experimental results on several objects are presented. Error analysis indicates that we are able to extract depth with an average error of less than 0.5 mm error in a working range of 700 mm to 900 mm from the camera. These results demonstrate that the technique is very effective.