IEEE Trans Image Process - An efficient camera calibration technique offering robustness and accuracy over a wide range of lens distortion.

Tópicos

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Resumo

In the field of machine vision, camera calibration refers to the experimental determination of a set of parameters that describe the image formation process for a given analytical model of the machine vision system. Researchers working with low-cost digital cameras and off-the-shelf lenses generally favor camera calibration techniques that do not rely on specialized optical equipment, modifications to the hardware, or an a priori knowledge of the vision system. Most of the commonly used calibration techniques are based on the observation of a single 3-D target or multiple planar (2-D) targets with a large number of control points. This paper presents a novel calibration technique that offers improved accuracy, robustness, and efficiency over a wide range of lens distortion. This technique operates by minimizing the error between the reconstructed image points and their experimentally determined counterparts in "distortion free" space. This facilitates the incorporation of the exact lens distortion model. In addition, expressing spatial orientation in terms of unit quaternions greatly enhances the proposed calibration solution by formulating a minimally redundant system of equations that is free of singularities. Extensive performance benchmarking consisting of both computer simulation and experiments confirmed higher accuracy in calibration regardless of the amount of lens distortion present in the optics of the camera. This paper also experimentally confirmed that a comprehensive lens distortion model including higher order radial and tangential distortion terms improves calibration accuracy.

Resumo Limpo

field machin vision camera calibr refer experiment determin set paramet describ imag format process given analyt model machin vision system research work lowcost digit camera offtheshelf lens general favor camera calibr techniqu reli special optic equip modif hardwar priori knowledg vision system common use calibr techniqu base observ singl d target multipl planar d target larg number control point paper present novel calibr techniqu offer improv accuraci robust effici wide rang len distort techniqu oper minim error reconstruct imag point experiment determin counterpart distort free space facilit incorpor exact len distort model addit express spatial orient term unit quaternion great enhanc propos calibr solut formul minim redund system equat free singular extens perform benchmark consist comput simul experi confirm higher accuraci calibr regardless amount len distort present optic camera paper also experiment confirm comprehens len distort model includ higher order radial tangenti distort term improv calibr accuraci

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