Device for measuring visibility distance
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United States of America Patent
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Jan 18, 2011
Issued Date -
N/A
app pub date -
Oct 19, 2005
filing date -
Oct 19, 2004
priority date (Note) -
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Abstract
The invention relates to a device for determining visibility distance in a landscape. The device comprises a camera for taking an image of said landscape; means for storing said image; means for associating each pixel of the image with information representative of the distance between the camera and the point in the landscape corresponding to said pixel, thereby obtaining a map of distances; means for processing the image to detect whether a pixel of the image presents contrast greater than a predetermined value relative to at least some adjacent pixels; means for applying said processing for detecting contrast successively to the pixels of the image beginning from the pixel corresponding to the greatest distance and continuing to the first pixel found to satisfy the contrast condition; and means for associating said pixel with distance information from said map of distances.
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Cited Art Landscape
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