A Smartphone Self-Calibration Method Without Control Information

Traditional camera calibration methods are limited by high-precision three-dimensional inspection tinker or calibration template with known space structure. Aiming at this problem, this paper puts forward a kind of camera calibration method without control information on the basis of the analysis of characteristics of smartphone imaging. This method includes two steps:Firstly, we collect images data according to 3×3 mode, select a reference image to take relative orientation with other images in order to build unit model, and build free net model through the proportional coefficient after model connection, then coordinates of projective centers and object space points will be all taken into one coordinate system of reference image; secondly, taking the base image selected as reference and considering additional parameter model, orientation elements of images relative to reference image and additional parameters will be gotten after self-calibration bundle block adjustment. Experimental results show that this calibration method is effective and can significantly improve the accuracy of measurement.