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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/11198

    Title: Focusing Control under Microscopic Views based on Regional Monotones of Image Focal Values
    Authors: Ku Chin Lin(林穀欽)
    Contributor: 機械工程系
    Date: 2010-10-15
    Issue Date: 2010-10-27 15:12:53 (UTC+8)
    Abstract: Generally, clarity of images or focal value (FV) varies
    in hill-shaped manner with respect to lens motion in a focus
    region. However, the FV variation in the far-off focused region
    is usually subjected to disturbances and the image signals may
    not be informative for focusing control. Therefore, challenges
    exist if focusing control under microscopic views for a large
    depth of lens displacement is needed. The challenges are
    primarily due to lack of a method to differentiate image FVs at
    far-off focused regions.
    This paper proposes a method to integrate regional
    monotones of FV variation. A focusing control algorithm with
    step-size adaptation is derived based on the above monotonous
    properties to gain speed and reliability. Information about the
    regional monotones is acquired and used for checking and
    correcting inconsistency in the motion direction of lens caused
    by image disturbances. This inconsistency check is significant on
    enhancing the robustness of focusing control.
    Four case studies are illustrated to demonstrate the feasibility
    of the proposed algorithm and the effects of design parameters.
    A response time of 0.6~1.2 sec with perfect reliability is achieved.
    This speed is relatively sufficient for many industrial
    applications, such as LCD panel laser repairs.
    Appears in Collections:[機械工程系所] 會議論文

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