Fish-eye image correction method and technique based on geometrical imaging model

LI Gen1， FEI Zhang-jun2， YANG Shi-you1
（1. College of Electrical Engineering， Zhejiang University， Hangzhou 310007， China；
2. Nanzi Information technology Co.，Ltd.， Nanjing 210012， China ）

Abstract： Fish-eye lenses with wide field of view（FOV） are widely used in the field of large scene video surveillance，but nonlinear radial distortion of fish-eye image violated the human visual habits and brought inconvenience to measurement and pattern recognition applications. In order to correct the fish-eye images，a new correction method and technique based on geometrical imaging model that corrects the images form different types of fish-eye lens by corresponding geometrical imaging model was proposed. Also，the implementation method of equidistant imaging model was developed. Finally，the optimization methods based on the cache and a fast bilinear interpolation implementation ensuring the accuracy aiming at the real-time application were presented. The results indicate that the new method works efficiently in a larger scale，and easier to implement.
Key words： fish-eye lens； radial distortion correction； imaeg process； video surveillance