Abstract Image-based defocus calibration (IBDC) and automatic focus tracking techniques are presented. The proposed technique is based on a Spatial-Domain Convolution/Deconvolution method (STM) developed by Subbarao and Surya [1]. STM uses two blur parameters, σ and β, of a camera lens system to determine a lens step of the best focus. However calibration of these parameters requires internal camera parameters such as focal length, image distance, etc. Without knowing accurate internal parameters, STM is subject to fail to obtain accurate defocus and depth information. We propose image-based sigma and beta calibration techniques for accurate depth measurement. We also show that beta calibration can be applied for automatic focus tracking of a moving object.


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    Titel :

    Image-Based Calibration of Spatial Domain Depth-from-Defocus and Application to Automatic Focus Tracking


    Beteiligte:
    Park, Soon-Yong (Autor:in) / Moon, Jaekyoung (Autor:in)


    Erscheinungsdatum :

    2006-01-01


    Format / Umfang :

    10 pages





    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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    Park, S.-Y. / Moon, J. | British Library Conference Proceedings | 2006


    Depth from Defocus Estimation in Spatial Domain

    Ziou, D. / Deschenes, F. | British Library Online Contents | 2001


    Depth from Defocus: A Spatial Domain Approach

    Subbarao, M. / Surya, G. | British Library Online Contents | 1994


    Passive Depth from Defocus using a Spatial Domain Approach

    Ziou, D. / IEEE; Computer Society | British Library Conference Proceedings | 1998