Intruder detection through trajectory analysis in monitoring and surveillance systems

• US 6,441,734 B1
• Filed: 12/12/2000
• Issued: 08/27/2002
• Est. Priority Date: 12/12/2000
• Status: Expired due to Term

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Brodsky, Tomas, Gutta, Srinivas
• Primary Examiner(s): MULLEN, THOMAS J
• Application Number:
  US09/734,821
• Publication Number:
  US 20020070859A1
• Time in Patent Office: 623 Days
• Field of Search: 340/541, 340/545.1, 340/547, 340/538, 348/143, 348/152, 348/153, 348/154, 348/155, 382/118
• US Class Current: 340/541
• CPC Class Codes: G08B 13/19602 Image analysis to detect motion of the intruder, e.g. by frame subtraction
• CPC Class Codes: G08B 13/19613 Recognition of a predetermined image pattern or behaviour pattern indicating theft or intrusion
• CPC Class Codes: G08B 13/19645 Multiple cameras, each having view on one of a plurality of scenes, e.g. multiple cameras for multi-room surveillance or for tracking an object by view hand-over
• CPC Class Codes: G08B 13/19652 Systems using zones in a single scene defined for different treatment, e.g. outer zone gives pre-alarm, inner zone gives alarm

Abstract

A security monitoring system including one or more cameras for monitoring a path of an individual, a recorder for recording the monitoring of the individual, trajectory analyzer for computing a trajectory of the path of the individual from the recorded monitoring, comparator for comparing the trajectory against known trajectories, and an alarm system for transmitting an alarm signal if the trajectory does not match one of the known trajectories. Further, the system may include a database for storing image data for each authorized individual of the structure and a recognition system for comparing images of the individual from the one or more cameras with the stored image data in the database. The alarm system transmits the alarm signal if the trajectory does not match one of the known trajectories and the individual is an authorized individual or if the individual is not an authorized individual.

Claims

1. A security monitoring system comprising:

at least one camera for monitoring a path of an individual inside and/or outside a structure;

a recorder for recording the monitoring of the individual;

trajectory analysis means for computing a trajectory of the path of the individual from the recorded monitoring;

comparison means for comparing the trajectory against known trajectories; and

an alarm system for transmitting an alarm signal based on the comparison, wherein the at least one camera comprises a camera for each of an entrance, exit, and one or more rooms of the structure.

2. A security monitoring system comprising:

at least one camera for monitoring a path of an individual inside and/or outside a structure;

a recorder for recording the monitoring of the individual;

trajectory analysis means for computing a trajectory of the path of the individual from the recorded monitoring;

comparison means for comparing the trajectory against known trajectories; and

an alarm system for transmitting an alarm signal based on the comparison, wherein the at least one camera is a video camera and the recorder records video segments of the path of the individual inside and/or outside the structure.

3. The security monitoring system of claim 2, wherein the trajectory analysis means is a computer vision system.

4. The security monitoring system of claim 2, wherein the trajectory analysis means computes the trajectory of the individual based on spatial and/or timing information derived from the monitoring.

5. The security monitoring system of claim 2, wherein the alarm system transmits the alarm signal if the trajectory does not match one of the known trajectories.

6. The security monitoring system of claim 2, wherein the alarm system does not transmit the alarm signal if the trajectory does match one of the known trajectories.

7. A security monitoring system comprising:

at least one camera for monitoring a path of an individual inside and/or outside a structure;

a recorder for recording the monitoring of the individual;

trajectory analysis means for computing a trajectory of the path of the individual from the recorded monitoring;

comparison means for comparing the trajectory against known trajectories;

an alarm system for transmitting an alarm signal based on the comparison;

a database for storing image data for each authorized individual of the structure; and

a recognition system for comparing images of the individual from the at least one camera with the stored image data in the database and for determining if the individual is one of the authorized individuals.

8. The security monitoring system of claim 7, wherein the stored image data in the database are face images and the recognition system is a face recognition system.

9. The security monitoring system of claim 7, wherein the alarm system transmits the alarm signal if the trajectory does not match one of the known trajectories and the individual is determined not to be one of the authorized individuals.

10. The security monitoring system of claim 7, wherein the alarm system does not transmit the alarm signal if the trajectory does match one of the known trajectories or the individual is determined to be one of the authorized individuals.

11. A method for monitoring a structure, the method comprising the steps of:

monitoring a path of an individual inside and/or outside the structure;

recording the monitoring of the individual;

computing a trajectory of the path of the individual from the monitoring;

comparing the trajectory against known trajectories;

determining whether to transmit an alarm signal based on the comparison;

storing image data for each authorized individual of the structure; and

comparing images of the individual from at least one camera with the stored image data in a database and determining if the individual is one of the authorized individuals.

12. The method of claim 11, wherein computing step comprises computing the trajectory of the individual based on spatial and/or timing information derived from the monitoring.

13. The method of claim 11, wherein the determining step comprises transmitting the alarm signal if the trajectory does not match one of the known trajectories.

14. The method of claim 11, wherein the determining step comprises not transmitting the alarm signal if the trajectory does match one of the known trajectories.

15. The method of claim 11, wherein the determining step comprises transmitting the alarm signal if the trajectory does not match one of the known trajectories and the individual is determined not to be one of the authorized individuals.

16. The method of claim 11, wherein the determining step comprises not transmitting the alarm signal if the trajectory does match one of the known trajectories or the individual is determined to be one of the authorized individuals.

17. The method of claim 11, wherein if the determining step determines that the trajectory does not match one of the known trajectories and the individual is determined to be one of the authorized individuals, the method further comprises the step of adding the trajectory to the known trajectories.