Helmholtz stereopsis guarantees unbiasedness by BRDF of the search for inter-image correspondences. In a practical setup, calibrated pixel sensitivity and corrected light anisotropy are required for the method to work well. In this paper a simple method for joint light-camera radiometric calibration is proposed. Such calibration is shown to be an ill-posed numerical problem. In the worst case of a single image pair, it can be regularized along epipolar lines only. The calibration problem becomes regularizable everywhere in the case of more pairs and cameras in a general position. A general, simple and fast calibration procedure is proposed that includes a regularizer for the single-pair case. It is shown in a ground-truth experiment that the accuracy of reconstructed surface normals improves by an order of magnitude after radiometric calibration.


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    Title :

    Radiometric calibration of a Helmholtz stereo rig


    Contributors:
    Janko, Z. (author) / Drbohlav, O. (author) / Sara, R. (author)


    Publication date :

    2004-01-01


    Size :

    516332 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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