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Apparatus and a method for detecting motion within an image sequence

  • US 6,081,606 A
  • Filed: 06/17/1996
  • Issued: 06/27/2000
  • Est. Priority Date: 06/17/1996
  • Status: Expired due to Term
First Claim
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1. Apparatus for detecting motion within a scene that is represented by a sequence of images, comprising:

  • a flow field generator for processing said sequence of images to produce a motion flow field, wherein said flow field generator comprises an image preprocessor for producing filtered images from said sequence of images and a flow field processor for generating said motion flow field from said filtered images, wherein said image preprocessor comprises an image selector for selecting three images from said sequence of images, a first subtractor for subtracting a first image from a second image to create a first difference image, a second subtractor for subtracting said second image from a third image to create a second difference image, a first filter for filtering said first difference image to produce a first filtered image, and a second filter for filtering said second difference image to produce a second filtered image;

    a flow field segmentor for extracting said motion flow field from said sequence of images; and

    an alarm detector for analyzing said motion flow field to determine if said motion flow field meets an alarm criteria.

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