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Vision-based scene detection

  • US 9,635,271 B2
  • Filed: 11/17/2011
  • Issued: 04/25/2017
  • Est. Priority Date: 11/17/2011
  • Status: Active Grant
First Claim
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1. A method of distinguishing between daytime lighting conditions and nighttime lighting conditions based on a captured image by a vision-based imaging device along a path of travel, the method comprising:

  • capturing an image by a vision-based imaging device;

    selecting a region of interest in the captured image;

    determining a light intensity value for each pixel within the region of interest;

    generating a cumulative histogram based on light intensity values within the region of interest, the cumulative histogram including a plurality of category bins representing the light intensity values, each category bin identifying an aggregate value of light intensity values assigned to each respective category bin;

    comparing an aggregate value within a predetermined category bin of the plurality of category bins to a first predetermined threshold; and

    determining whether the image is captured during the daytime lighting conditions as a function of the aggregate value within the predetermined category bin,wherein determining whether the image is captured during the daytime lighting conditions is based on the aggregate value being less than a first predetermined threshold, andwherein determining whether the captured image is obtained during the daytime lighting conditions includes determining whether the captured image includes a daylight blocking structure over the path of travel.

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