Proceedings PaperCalibration of a CCD camera on a hybrid coordinate measuring machine for industrial metrology
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A methodology for the calibration of a CCD low-cost camera mounted on a CMM machine is described. Several kinds of geometric distortion are taken into account in the camera model. Five distortion parameters are introduced modeling both radial and non-radial effects. A two- phase methodology is developed for the parameter estimation. In the first phase, a closed-form solution is reached for the intrinsic and the extrinsic parameters neglecting distortion effects. In the second phase, an iterative procedure estimates separately the distortion and the non- distortion parameters, to avoid harmful interactions. The main novelty of the solution is the use of only linear systems, avoiding any non-linear optimization process. Low-level image processing used for calibration images is described. Experimental results and comparisons with more simplified camera models and estimation strategies are presented.