Lambertian photometric stereo with unknown light source parameters is ambiguous. Provided that the object imaged constitutes a surface, the ambiguity is represented by the group of generalised bas-relief (GBR) transformations. We show that this ambiguity is resolved when specular reflection is present in two images taken under two different light source directions. We identify all configurations of the two directional lights which are singular and show that they can easily be tested for. While previous work used optimisation algorithms to apply the constraints implied by the specular reflectance component, we have developed a linear algorithm to achieve this goal. Our theory can be utilised to construct fast algorithms for automatic reconstruction of smooth glossy surfaces.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Can two specular pixels calibrate photometric stereo?


    Contributors:
    Drbohlav, O. (author) / Chaniler, M. (author)


    Publication date :

    2005-01-01


    Size :

    740059 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Can Two Specular Pixels Calibrate Photometric Stereo?

    Drbohlav, O. / Chantler, M. / IEEE | British Library Conference Proceedings | 2005



    Stereo and Specular Reflection

    Bhat, D. N. / Nayar, S. K. | British Library Online Contents | 1998


    Polarisation photometric stereo

    Atkinson, Gary A. | British Library Online Contents | 2017


    Apparatus and methods to calibrate a stereo camera pair

    GANGULI ANURAG / DALY JR TIMOTHY P / GUPTA MAYANK et al. | European Patent Office | 2023

    Free access