Tray for assessing the threat status of an article at a security check point

• US 8,009,800 B2
• Filed: 04/02/2009
• Issued: 08/30/2011
• Est. Priority Date: 10/02/2006
• Status: Expired due to Fees

• Current Assignee: Vanderlande Industries BV (VIVE BV)
• Original Assignee: Optosecurity Inc.
• Inventors: Gudmundson, Dan, Doyle, Aidan
• Primary Examiner(s): Glick; Edward J
• Assistant Examiner(s): Artman; Thomas R
• Application Number:
  US12/385,253
• Publication Number:
  US 20090196396A1
• Time in Patent Office: 880 Days
• Field of Search: 378/56, 378/57, 378/207, 378/208
• US Class Current: 378/56
• CPC Class Codes: G01V 5/20 Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects

Abstract

A method for performing security screening of a liquid product at a security checkpoint is provided. The liquid product is placed in a tray having at least two reference areas manifesting respective X-ray signatures when exposed to X-rays, the X-ray signatures being distinguishable from one another. An X-ray inspection of the tray is performed while the tray holds the liquid product, the X-ray inspection including deriving the X-ray signatures. A determination is made as to whether the liquid product is a security threat at least in part based on the X-ray signatures. A tray having at least two reference areas manifesting respective X-ray signatures when exposed to X-rays is also provided.

Claims

1. Method for performing security screening at a checkpoint, including:

a) placing a liquid product in a tray having at least two reference areas manifesting respective X-ray signatures when exposed to X-rays, the X-ray signatures being distinguishable from one another;

b) performing an X-ray inspection of the tray while the tray holds the liquid product, the X-ray inspection including deriving the X-ray signatures;

c) determining if the liquid product is a security threat based at least in part on the X-ray signatures.

2. A method as defined in claim 1, including generating X-ray image data during the X-ray inspection and deriving the X-ray signatures from the X-ray image data.

3. A method as defined in claim 2, including processing the X-ray image data with a computer based processing device in determining if the liquid product is a security threat.

4. A method as defined in claim 3, wherein the X-ray image data conveys X-ray image information on the liquid product.

5. A method as defined in claim 4, wherein the X-ray signatures in the X-ray image data are conveyed by respective grey scale levels of portions of the image that correspond to the respective reference areas.

6. A method as defined in claim 1, wherein the performing of the X-ray inspection is made by an X-ray imaging system, the determining including using the X-ray signatures to perform self-calibration of the X-ray imaging system.

7. A method as defined in claim 1, wherein the determining including comparing the X-ray signatures of the reference areas to an X-ray signature of the liquid product.

8. A method as defined in claim 1, wherein the tray includes more than two reference areas, the reference areas manifesting respective X-ray signatures when exposed to X-rays, the X-ray signatures being distinguishable from one another.

9. Method for performing security screening at a checkpoint, including:

a) providing an X-ray imaging system having a scanning area;

b) providing a supporting device for supporting articles to be scanned in the scanning area, wherein the supporting device has at least two reference areas manifesting respective X-ray signatures when exposed to X-rays, the X-ray signatures being distinguishable from one another;

c) placing an article to be scanned on the supporting device;

d) introducing the article to be scanned in the scanning area while the article is supported by the supporting device;

e) based at least in part on the X-ray imaging system, deriving the X-ray signatures of the reference areas and obtaining an X-ray image of the article while the article is supported on the supporting device;

f) determining if the article is a security threat based at least in part on the X-ray signatures.

10. A method as defined in claim 9, including moving the article away from the scanning area while the article is supported on the supporting device.

11. A method as defined in claim 10, wherein the article is a first article, the method including:

a) removing the first article from the supporting device;

b) placing a second article in the supporting device;

c) introducing the second article in the scanning area while the second article is supported by the supporting device;

d) based at least in part on the X-ray imaging system, deriving the X-ray signatures of the reference areas and obtaining an X-ray image of the second article while the second article is supported on the supporting device;

e) determining if the second article is a security threat based at least in part on the X-ray signatures.

12. A method as defined in claim 9, wherein the supporting device includes a tray.

13. A method as defined in claim 12, wherein the article includes a liquid product.

14. A method as defined in claim 13, including generating X-ray image data which conveys X-ray image information on the liquid product and the X-ray signatures of the reference areas.

15. A method as defined in claim 14, including processing the X-ray image data with a computer based processing device in determining if the liquid product is a security threat.

16. A method as defined in claim 15, wherein the X-ray signatures in the X-ray image data are conveyed by respective grey scale levels of portions of the image that correspond to the respective reference areas.

17. A method as defined in claim 9, wherein the determining including using the X-ray signatures to perform self-calibration of the X-ray imaging system.

18. A method as defined in claim 9, wherein the determining including comparing the X-ray signatures of the reference areas to an X-ray signature of the liquid product.

19. A method as defined in claim 9, wherein the supporting device includes more than two reference areas, the reference areas manifesting respective X-ray signatures when exposed to X-rays, the X-ray signatures being distinguishable from one another.

20. A method for performing security screening on a plurality of liquid products at a security checkpoint, comprising:

a) providing an X-ray imaging system having a scanning area;

b) providing a supporting device for supporting a liquid product during a scanning cycle performed with the X-ray imaging system on the liquid product, the supporting device including at least one reference material manifesting an X-ray signature in response to exposure to X-rays;

c) using the supporting device to perform a succession of scanning cycles on respective ones of the liquid products;

d) wherein each scanning cycle includes;

i.) deriving the X-ray signature of the reference material;

ii.) performing a self-calibration of the X-ray imaging system based at least in part on the X-ray signature;

iii.)determining if the liquid product is a security threat.

21. A method as defined in claim 20, wherein the X-ray imaging system determines if the liquid product is a security threat by processing X-ray image data of the liquid product.

22. A method as defined in claim 21, wherein each scanning cycle includes subjecting the supporting device and the liquid product to X-rays and deriving X-rays image data of the supporting device and of the liquid product.

23. A method as defined in claim 22, wherein each scanning cycle includes deriving the X-ray signature from the X-ray image data.

24. A method as defined in claim 23, wherein each scanning cycle includes processing the X-ray image data to determine if the liquid product is a security threat.

25. A method as defined in claim 24, wherein the supporting device includes two or more reference materials manifesting respective X-ray signatures when exposed to X-rays, the X-ray signatures being distinguishable from one another.

26. A method as defined in claim 25, wherein the X-ray signatures in the X-ray image data are conveyed by respective grey scale levels of portions of the image that correspond to the respective reference materials.

27. A method as defined in claim 20, wherein the supporting device includes a tray.

28. A method for performing security screening on liquid products, comprising;

a) scanning the liquid product, a first reference material and a second reference material with an X-ray imaging system, the first reference material and the second reference material manifesting respective X-ray signatures when exposed to X-rays, the X-ray signatures being distinguishable from one another, the scanning generating X-ray image data of the liquid product and of the first and second reference materials;

b) deriving the X-ray signature from the X-ray image data;

c) performing a self-calibration of the X-ray imaging system based at least in part on the X-ray signature;

d) determining with the self-calibrated imaging system if the liquid product is a security threat.

29. A method as defined in claim 28, wherein the first and the second reference materials are provided in a tray which supports the liquid product while the liquid product is scanned with the X-ray imaging system.

30. A tray for supporting an article while the article is subjected to X-ray inspection, the tray including at least two reference areas manifesting respective X-ray signatures when exposed to X-rays, the X-ray signatures being distinguishable from one another, wherein the tray has an article receiving area in which one or more articles to be subjected to X-ray inspection can be placed and a rim portion that extends along the article receiving area, at least one of the reference areas being located on the rim portion.

31. A tray as defined in claim 30, wherein the tray is made from base material in which is placed an insert of reference material corresponding to one of the reference areas.

32. A tray as defined in claim 31, wherein the X-ray signatures are characterized by respective grey scale levels in an X-ray image of the tray.

33. A tray as defined in claim 32, wherein the grey scale level of each reference area is uniform across the reference area.

34. A tray as defined in claim 30, wherein the tray is made from base material in which are placed inserts of reference materials corresponding to the reference areas.

35. A tray as defined in claim 34, wherein the reference materials are distinct from one another.

36. A tray as defined in claim 30, wherein at least one of the reference areas is located within the article receiving area.

37. A tray as defined in claim 30, wherein the rim portion includes a flat top area, the at least one of the reference areas being located on the flat top area.

38. An X-ray inspection station for performing security screening on liquid products, the X-ray inspection station comprising:

a) an X-ray scanning area where one or more liquid products are exposed to X-rays;

b) a supporting device for supporting one or more liquid products while the liquid products are exposed to X-rays in the scanning area, the supporting device having at least two reference areas manifesting respective X-ray signatures when exposed to X-rays, the X-ray signatures being distinguishable from one another;

c) a computer based processing unit responsive to an interaction between X-rays and the supporting device to perform self-calibration for processing X-ray image data of the one or more liquid products to determine if the one or more liquid products are a security threat.

39. An X-ray inspection station as defined in claim 38, wherein the computer based processing unit processes information conveying the X-ray signatures for performing self-calibration.

40. An X-ray inspection station as defined in claim 39, wherein the X-ray signatures are conveyed in the X-ray image data.

41. An X-ray inspection station as defined in claim 40, wherein the X-ray signatures in the X-ray image data are conveyed by respective grey scale levels of portions of the image that correspond to the respective reference areas.

42. A method for performing security screening of a liquid product at a security checkpoint, comprising;

1) placing the liquid product in a tray which has a reference area;

2) performing an X-ray inspection of the tray holding the liquid product;

3) comparing the X-ray signature of the liquid product to the X-ray signature of the reference area;

4) determining a threat status associated with the liquid product based at least in part on results obtained by comparing the X-ray signature of the liquid product to the X-ray signature of the reference area, the threat status conveying whether the liquid product is a security threat.

43. A method as defined in claim 42, wherein the tray has a plurality of reference areas, the reference areas having different X-ray signatures.

44. A method as defined in claim 42, wherein the comparing is done by a computer.

45. A method as defined in claim 44, wherein the X-ray inspection is performed by an X-ray imaging system.

46. A method as defined in claim 45, wherein the X-ray imaging system produces X-ray image data, the method including performing an analysis of the X-ray image data with the computer to determine the threat status of the liquid product.

47. A security screening system suitable for determining if a liquid product presents a security threat, the liquid product being comprised of a container holding a liquid, the screening system comprising:

1) an input for receiving image data conveying an image depicting the liquid product and depicting a reference area, the image data being produced by subjecting the liquid product and the reference area to penetrating radiation;

2) a logic module for;

i) deriving from the image data a signature to penetrating radiation of the liquid held in the liquid product;

ii) processing the image data to derive a signature to penetrating radiation of the reference area;

iii) comparing the derived signature to penetrating radiation of the liquid held in the liquid product to the derived signature to penetrating radiation of the reference area;

iv) processing the image data at least in part based on results obtained in iii) to derive a threat status associated with the liquid product, the derived threat status conveying whether the liquid product poses a security threat.

48. A security screening system as defined in claim 47, wherein the penetrating radiation includes X-rays.

49. A security screening system as defined in claim 47, wherein the reference area includes a reference liquid material.

50. A security screening system as defined in claim 49, wherein the reference liquid material is selected from the group consisting of water, carbonated beverage, fruit juice, toothpaste and a cosmetic liquid.

51. A security screening system as defined in claim 47, wherein said image data received at said input conveys an identifier allowing locating an entry in a database that conveys the signature to penetrating radiation of the reference area.

52. A security screening system as defined in claim 47, wherein the image conveyed by the image data received at said input depicts the liquid product and a plurality of reference areas, the image being produced by subjecting the liquid product and the plurality of reference area to penetrating radiation, each reference area in said plurality of reference areas being associated with a respective signature when exposed to penetrating radiation.