Moving body detection device of camera

  • US 5,627,586 A
  • Filed: 04/08/1993
  • Issued: 05/06/1997
  • Est. Priority Date: 04/09/1992
  • Status: Expired due to Term
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First Claim
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1. A moving object-detection device of a camera, comprising:

  • video signal output means for outputting a video signal representing an object to be photographed;

    input means for inputting a position of a gazing point;

    first storing means for storing a first video signal representing images which are included in a moving object detection zone and four corners of an image plane at a first timing, as basis signals, and second storing means for storing a second video signal representing images which are included in the moving object detection zone and the four corners of the image plane at a second timing after a predetermined time period from the first timing, as reference signals, the moving object detection zone being a part of an image represented by the video signal and the four corners being parts of the image represented by the video signal, and wherein the moving object detection zone has the gazing point and a periphery region which extends from the gazing point and comprises a plurality of divided zones such that the divided zones partially overlap each other;

    contrast determination means for determining contrast of each of the images of the moving object detection zone and the four corners on the basis of the first video signals;

    third storing means for storing a determination result indicating that the contrast of the divided zones of the moving object detection zone and the four images of the four corners is low, in association with a number assigned to the divided zone and the four images, respectively;

    correlation calculation means for performing a correlation calculation with respect to said each of the images of the divided zones and the four corners which are represented by the first video signal and said each of the images of the divided zones and the four corners which are represented by the second video signal, in each of horizontal and vertical directions, thereby to obtain a correlation value, in association with a number assigned to an associated one of the divided zones and the four corners, respectively;

    reliability determination means for determining reliability of the correlation value;

    fourth storing means for storing a determination result indicating that the reliability of the correlation value of each of the images of the divided zones and the four corners is low, in association with a number assigned to an associated one of the divided zone and the four corners, respectively;

    classifying means for classifying the images, which are other than the images determined to have low contrast or low reliability of the correlation value, thereby to determine whether or not the correlation value of said each of the images to be classified, in said each of the horizontal and vertical directions, falls within a predetermined range;

    determination means for determining that the image included in the moving object detection zone is static when the number of the images, each of which has the correlation value determined to fall within the predetermined range, is one, the image included in the moving object detection zone has moved in a direction differing from a direction where the four images have moved, when the number of the images, each of which has the correlation value determined to fall within the predetermined range, is two, and the image included in the moving object detection zone is unable to be tracked when the number of the images, each of which has the correlation value determined to fall within the predetermined range, is three or more.

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