• phase filter?

    From RichD@21:1/5 to All on Tue Mar 19 12:46:24 2019
    I attended a seminar on computational imaging last week.
    It was mostly over my head, as usual.

    The speaker discussed a research project. They work
    on the problem of maintaining focus, or de-blurring,
    an object as it moves along the z-axis, that is, in
    and out of the focal plane.

    The key element is a customized phase filter, inserted
    in front of the objective lens. Apparently a major
    design challenge, as it can't be solved analytically,
    and even numerically, very difficult.

    All very interesting, except it leaves me wondering:
    can anybody here expound on this phase filter
    thigamabob, what's the magic sauce?


    --
    Rich

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