Lens Distortion Correction Method of Linear Array Camera

The imaging technology basing on binocular stereo vision of linear array camera can effectively detect foreign bodies existing in automobile chassis so that ensure the safety of people. However, the distortion of camera lens can influence the precision of system measurement and three-dimensional reconstruction. Because of the difference between the imaging principle of linear array camera and the imaging principle of plane array camera, this leads that the lens distortion correction algorithm applying to plane array camera cannot be directly used in linear array camera. Infer the distortion model of linear array camera by means of studying the distortion model of plane array camera and according to the characteristics of linear array camera. Establish a system of equations in accordance with the distortion mathematical model of linear array camera, then utilize cross ratio invariability and spacing ratio invariability to obtain the radial distortion coefficient and distortion center. This method should be used before the calibration of linear array camera, because it can effectively eliminate the influence of lens error to the whole calibration results.