Video monitoring method and device

Video monitoring method and device

  • CN 104,954,747 B
  • Filed: 06/17/2015
  • Issued: 07/07/2020
  • Est. Priority Date: 06/17/2015
  • Status: Active Grant
First Claim
Patent Images

1. A video surveillance method characterized by:

  • acquiring a plane video image;

    determining plane coordinate information of a target in the plane video image according to the plane video image;

    3D reconstruction is carried out through a 3D reconstruction algorithm according to the plane coordinate information to obtain three-dimensional coordinate information of the target;

    extracting event occurrence based on the change situation of the position relation of the target and the virtual door, comprising;

    acquiring a straight line which is perpendicular to the lower boundary of the video image through the lowest point of the center of the video image, and taking the straight line as a reference straight line;

    acquiring an included angle α

    between a connecting line of the target and the reference point and a reference straight line, and a distance d between the target and the reference point;

    obtaining the included angle between the reference line and the connecting line of each end point of the virtual door and the ground intersecting line, determining the distance d between the reference line and the end point corresponding to the smallest included angle between the reference line and the connecting line of the end point to the reference point larger than α

    1And the distance d between the end point corresponding to the included angle between the connecting line from the maximum end point to the reference point and the reference straight line, which is smaller than α

    , and the reference point2

    Determining d and d1

    d2The magnitude relationship of (1);

    according to d and d1

    d2Determining the change condition of the position relationship between the target and the virtual door according to the change condition of the previous frame and the current frame;

    the virtual door comprises three-dimensional coordinate information, the virtual door is a door area vertical to the ground, and the intersection line of the virtual door and the ground is a straight line, a line segment or a broken line.

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