An Approximate Camera Calibration Method

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  • カメラの近似的検定の方法
  • カメラ ノ キンジテキ ケンテイ ノ ホウホウ

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An approximate camera calibration method without using any photogoniometer or angle measurement was tried for the preliminary calibration of the taken camera. A flat terrain with vast quantity of canals, rivers and ditches was selected and the heights of water surface was measured with a precise plotting instrument at many points scattering over the stereo-model.<BR>After adjustments of model inclination and the effects of the Earth's curvature, the height discrepancies at each points from the datum plane was expressed as the function of bi-polar coordinnates, which has their poles at the principal points of the two photos.<BR>Assuming a polinomial form for the distortion, the residual bight discrepancies were computed and compared with the measured values And the distortion polinominals was corrected by iteration.<BR>Actual analysis was carried out graphically, with not so high accuracy which can not be expected from such a approximate method. Also, the determination of the principal points on the photo-plane was not tried because of the poor resultant accuracy which may be expected from such a approximate method.

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