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  • US 20020039135A1
  • Filed: 04/23/2001
  • Published: 04/04/2002
  • Est. Priority Date: 12/23/1999
  • Status: Active Grant
First Claim
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1. A method for monitoring a monitored area comprising the steps of recording an image of the monitored area and of comparing the recorded image with a reference image in order to determine whether there is an alarm situation, characterized by the step of creating the reference image by combining at least two previously stored images from a set of images, so that the lighting conditions in the reference image are adjusted to the lighting conditions in the recorded image.

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