Daytime and nighttime image recognizing method and apparatus
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United States of America Patent
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Jun 19, 2012
Grant Date -
Jul 3, 2008
app pub date -
Dec 20, 2007
filing date -
Dec 29, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a daytime and nighttime image recognizing method and apparatus, the method comprises predefining an air region and a terrestrial region for each image captured by a camera apparatus; inputting an image captured by the camera apparatus; calculating a lightness value histogram for the air region of the input image; and determining a lighting condition of a photo environment of the camera apparatus based on the lightness value histogram for the air region of the input image. The daytime and nighttime image recognizing method and apparatus are able to correctly recognize the lighting condition of the environment even if the air region in an image is obstructed by a background or there are no lane lines in an image. Moreover, when an erroneous recognition occurs for an individual image, the interference caused by the erroneous recognition can be precluded efficiently.
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