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  • Title: Sub-pixel projector calibration method for fringe projection profilometry.
    Author: Zhang W, Li W, Yu L, Luo H, Zhao H, Xia H.
    Journal: Opt Express; 2017 Aug 07; 25(16):19158-19169. PubMed ID: 29041109.
    Abstract:
    Digital projectors are used as standard parts at present in fringe projection profilometry systems to project structured-light patterns onto the object surface to be measured, and the distortion of the projector lens must be calibrated and compensated accurately to satisfy the accuracy requirement of industrial applications. A novel method is proposed to determine the projector pixel coordinates of the marker points of a calibration target accurately in terms of projective transform. With the method, the projector can be calibrated with accuracy of sub-pixel level. The method is applicable for the calibration target with a chessboard pattern or a circle pattern, and the calibration result is independent on the results of camera calibration. Experimental results are shown to demonstrate the effectiveness and validity of the proposed method.
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