Daytime and nighttime image recognizing method and apparatus

  • US 8,204,305 B2
  • Filed: 12/20/2007
  • Issued: 06/19/2012
  • Est. Priority Date: 12/29/2006
  • Status: Expired due to Fees
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First Claim
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1. A daytime and nighttime image recognizing method, comprising:

  • inputting an image captured by a camera apparatus;

    predefining an air region and a terrestrial region for the input image captured by the camera apparatus;

    calculating a lightness value histogram for the air region of the input image;

    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, wherein determining the lighting condition further includes;

    judging whether a ratio of a number of pixels with lightness values larger than a first lightness value (T1) in the air region of the input image to the total number of pixels in the air region of the input image is greater than a first ratio; and

    determining the photo environment of the camera apparatus as a daytime lighting condition if the judgment result is affirmative; and

    wherein calculating the lightness value histogram and determining the lighting condition require no vehicle lane lines in the input image.

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