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Old 30th December, 2006, 06:45 PM
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Polorization lighting the shadows

For machine vision, separating shadows from actual objects has proven to be a very difficult problem to tackle, and this has been on of the factors limiting the ability of machines to interact with their environment. While machines can typically handle single shadows on an object, when multiple shadows overlap on an object, the machines are unable to cope and become confused about the size and shape of the object being shadowed.

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Old 30th December, 2006, 07:10 PM
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Very clever idea.
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Old 30th December, 2006, 07:26 PM
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I thought so, too. One of the reasons I posted it in this forum, though, is that I know that polarizing filters are widely used in photography for certain purposes (though I admit I don't know what for), and thought it might generate some discussion.
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Old 30th December, 2006, 07:35 PM
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I wonder if this sort of Tech can be applied to CCTV. So many times, especially in low light conditions, the CCTV footages provide very little detail, especially in the case of ID'ing a person.
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Old 30th December, 2006, 07:42 PM
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I would imagine there will be a great many applications for it.
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Old 30th December, 2006, 09:23 PM
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Machine vision is mainly used in industrial type situations. For example, on factory production lines for quality control purposes.

This isn't much use there, because that is a controlled environment where the lighting can be set-up to eliminate shadows.

I can imagine it would be of use on bomb disposal robots. Looking in shadowy nooks and crannies for suspect devices.
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Old 31st December, 2006, 02:34 PM
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Pitch's point about CCTV is highly valid. If you've ever read Rising Sun by Michael Crichton, you'll know why.
If you haven't, then read it.
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