Image data processing

• US 6,774,905 B2
• Filed: 12/22/2000
• Issued: 08/10/2004
• Est. Priority Date: 12/23/1999
• Status: Expired due to Fees

• Current Assignee: Secumanagement B.V.
• Original Assignee: Wespot AB (OPTEX Technologies BV)
• Inventors: Merheim, Christian, Rodman, Andreas, Elfving, Mats
• Primary Examiner(s): Zimmerman, Mark
• Assistant Examiner(s): Nguyen, Kimbinh T.
• Application Number:
  US09/746,777
• Publication Number:
  US 20030043160A1
• Time in Patent Office: 1,327 Days
• Field of Search: 348/154, 348/159, 345/441, 345/581, 345/419, 345/421, 345/422, 345/427, 345/428, 345/506, 345/620, 345/627
• US Class Current: 345/581
• CPC Class Codes: G06T 7/0002 Inspection of images, e.g. flaw detection
• CPC Class Codes: G06T 7/254 involving subtraction of images
• CPC Class Codes: G08B 13/19602 Image analysis to detect motion of the intruder, e.g. by frame subtraction
• CPC Class Codes: G08B 13/19656 Network used to communicate with a camera, e.g. WAN, LAN, Internet
• CPC Class Codes: G08B 13/19684 Portable terminal, e.g. mobile phone, used for viewing video remotely
• CPC Class Codes: G08B 13/19691 Signalling events for better perception by user, e.g. indicating alarms by making display brighter, adding text, creating a sound
• CPC Class Codes: H04N 7/188 Capturing isolated or intermittent images triggered by the occurrence of a predetermined event, e.g. an object reaching a predetermined position signal generation from motion picture films H04N5/253

Abstract

A method and a device for managing image information in a monitoring system. The monitoring system comprises at least one monitoring module (1) for monitoring a monitored location and a remote recipient unit (3). The method comprises the steps of recording an image of the monitored location with the monitoring module (1), segmenting out a distinct region by comparing the recorded image with a reference image in the monitoring module (1), creating an outline shape in the monitoring module which represents the edge of the distinct region, transmitting data which represents the outline shape to the recipient unit (3), recreating the outline shape in the recipient unit by means of said transmitted data, and displaying the outline shape visually in the recipient unit.

Claims

1. A method for managing image information in a monitoring system having at least one monitoring module for monitoring a monitored location and a remote recipient unit, said method comprising the steps of:

recording an image of the monitored location using the monitoring module;

in response to a change occurring during image recording as relating to at least one object in said image, segmenting said object to create a distinct region by comparison of the recorded image with a reference image in the monitoring module including by generating, from the recorded image and a reference image of the monitored location, a difference image containing at least a portion of the object;

in response to said segmenting, creating an outline shape in the monitoring module by tracing along edge of the distinct region, said outline shape being a representation of the edge of the distinct region;

transmitting data representing the outline shape to the recipient unit, said outline shape reducing transmission time and bandwidth from transmitting said segmented object represented by the distinct region, or maintaining privacy of the object by not allowing detailed recognition including where the object has a human shape;

recreating the outline shape in the recipient unit using said transmitted data; and

displaying the outline shape visually in the recipient unit.

2. The method according to claim 1, in which the step of creating the outline shape comprises the steps of:

creating an outline image of the distinct region; and

fitting the outline shape to the outline image.

3. The method according to claim 2, in which the step of creating the outline image comprises the step of following the edge of the distinct region by means of a search function.

4. The method according to claim 1, further comprising the step of classifying the distinct region in the monitoring module based on at least one characteristic belonging to the distinct region, the classification controlling the transmission of said data.

5. The method according to claim 1, further comprising the step of comparing, in the monitoring module, particular characteristics belonging to the distinct region with corresponding characteristics belonging to a segmented region out of at least one previously recorded image, a movement history of the distinct region being recorded if the characteristics conform to the extent that the characteristics are determined to represent the same object.

6. The method according to claim 5, further comprising the step of classifying in the monitoring module the distinct region based on the recorded movement history of the distinct region, the classification controlling the transmission of said data.

7. The method according to claim 5, further comprising the step of classifying the distinct region in the monitoring module based on at least one characteristic belonging to the distinct region, the classification controlling the transmission of said data.

8. The method according to claim 5, in which data representing the movement history is transmitted to the recipient unit together with said data representing the outline shape and is recreated for visual display.

9. The method according to any one of claims 4, 6, 7 or 8, in which said data is only transmitted if the distinct region is classified as human-related.

10. The method according to claim 1, further comprising the step of storing the data which is to be transmitted to the recipient unit in the monitoring module prior to transmission.

11. The method according to claim 1, further comprising the step of transmitting supplementary monitoring information within the distinct region to the recipient unit.

12. The method according to claim 1, further comprising the step of displaying the recreated outline shape on a background image in the recipient unit.

13. The method according to claim 1, in which communication between the monitoring module and the recipient unit is carried out by wireless means.

14. The method according to claim 1, in which the outline shape is represented by a polygon.

15. The method according to claim 14, in which the polygon is represented by a number of points that vary in number.

16. The method according to claim 1, in which the outline shape is represented by a spline function.

17. A computer program product comprising program code which is stored on a computer-readable medium and which, when loaded into a computer, carries out the method steps according to claim 1.

18. A device for managing image information, said device having at least one monitoring module for monitoring a monitored location and a remote recipient unit, the monitoring module comprising:

a light sensitive sensor which is arranged to record an image of the monitored location;

a calculating unit which is arranged, in response to a change occurring during image recording as relating to at least one object in said image, to segment said object to create a distinct region by comparing the recorded image with a reference image including by generating, from the recorded image and a reference image of the monitored location, a difference image containing at least a portion of the object, and, in response said segmenting, to create an outline shape which is a representation of edge of the distinct region by tracing along the edge of the distinct region; and

a communication unit which is arranged to transmit data representing the outline shape to the recipient unit, said outline shape reducing transmission time and bandwidth from transmitting said segmented object represented by the distinct region, or maintaining privacy of the object by not allowing detailed recognition including where the object has a human shape;

wherein the recipient unit being arranged to receive said transmitted data, to recreate the outline shape and to display the outline shape visually.

19. The device according to claim 18, in which the calculating unit is further arranged to classify the distinct region based on at least one characteristic belonging to the distinct region, and to control the transmission of said data based on the classification.

20. The device according to claim 18, in which the monitoring module further comprises a memory means, which is arranged to store data.

21. The device according to claim 18, in which the monitoring module and the recipient unit interpret information according to a mathematical model.

22. The device according to claim 18, further comprising an audio device for transmission of audio information from the monitoring module to the monitoring station.

23. The device according to claim 18, in which the communication unit comprises a wireless communication device.

24. The device according to claim 20, wherein the stored data includes data about the at least one characteristic belonging to the distinct region.

25. The device according to claim 20, wherein the stored data includes data that represents the outline shape.

26. A monitoring module for monitoring a monitored location comprising:

a light-sensitive sensor, which is arranged to record an image of the monitored location;

a calculating unit which is arranged, in response to a change occurring during image recording relating to at least one object in the image, to segment said object to create a distinct region by comparing the recorded image with a reference image including by generating, from the recorded image and a reference image of the monitored location, a difference image containing at least a portion of the object and, in response to said segmenting, to create an outline shape which is a representation of edge of the distinct region by tracing along the edge of the distinct region; and

a communication unit which is arranged to transmit data which represents the outline shape to a remote recipient unit, said outline shape reducing transmission time and bandwidth from transmitting said segmented object represented by the distinct region, or maintaining privacy of the object by not allowing detailed recognition including where the object has a human shape.