Liquid droplet recognition apparatus, raindrop recognition apparatus, and on-vehicle monitoring apparatus
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United States of America Patent
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Jun 18, 2013
Grant Date -
Aug 19, 2010
app pub date -
Jan 26, 2010
filing date -
Feb 16, 2009
priority date (Note) -
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Abstract
Disclosed is a liquid droplet recognition apparatus for detecting liquid droplets attached to a front surface of a transparent member. The apparatus includes an image pickup apparatus that picks up a vertically polarized light image and a horizontally polarized light image at the front surface of the transparent member from a side of a rear surface of the transparent member; and a signal processing unit that determines whether the liquid droplets are attached to the front surface of the transparent member based on a polarized-light image ratio composed of the vertically polarized light image and the horizontally polarized light image picked up by the image pickup apparatus.
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