SYSTEMS AND METHOD FOR SCANNING A CONTINUOUS STREAM OF OBJECTS

• US 20100230242A1
• Filed: 03/11/2009
• Published: 09/16/2010
• Est. Priority Date: 03/11/2009
• Status: Abandoned Application

• Current Assignee: Morpho Detection (Safran SA)
• Original Assignee: Morpho Detection (Safran SA)
• Inventors: Gaultier, Francois Robert, Kourinny, Mikhail, Gao, Jian, Ingerman, Eugene Alex, Basu, Samit Kumar, Landolfi, Pierfrancesco, Pourjavid-Granfors, Sussan
• Application Number:
  US12/401,907
• Publication Number:
  US 20100230242A1
• Time in Patent Office: Days
• US Class Current: 198/502.200
• CPC Class Codes: G01N 2223/419 computed tomograph
• CPC Class Codes: G01N 23/046 using tomography, e.g. computed tomography [CT]
• CPC Class Codes: G01V 5/20 Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects

Abstract

A method for scanning a stream of objects includes conveying the stream of objects through a scanning system using a conveyor, marking a leading edge position of an object within the stream of objects with respect to a first known distance between a sensor and a start of a scan range, and recording data associated with the object when the leading edge position reaches the start of the scan range. The method also includes marking a trailing edge position of the object with respect to a second known distance between the sensor and an end of the scan range, halting recording of the data when the trailing edge reaches the end of the scan range, and generating a three-dimensional image of the object based on the recorded data.

Claims

1. A method for scanning a stream of objects, said method comprising:

conveying the stream of objects through a scanning system using a conveyor;

marking a leading edge position of an object in the stream of objects with respect to a first known distance between an edge sensor and a start of a scan range;

recording data associated with the object when the leading edge position reaches the start of the scan range;

marking a trailing edge position of the object with respect to a second known distance between the edge sensor and an end of the scan range;

halting recording of the data when the trailing edge reaches the end of the scan range; and

generating a three-dimensional image of the object based on the recorded data.

2. The method of claim 1, wherein marking a leading edge position of an object comprises detecting the leading edge of the object using an infrared (IR) sensor.

3. The method of claim 1, further comprising adjusting the leading edge position based on a desired distance between successive objects in the stream of objects.

4. The method of claim 1, wherein recording data associated with the object comprises:

comparing the leading edge position with conveyor position data that corresponds to the start of the scan range; and

recording the data when the leading edge position reaches the start of the scan range.

5. The method of claim 1, wherein marking a trailing edge position of an object comprises detecting the trailing edge of the object using an infrared (IR) sensor.

6. The method of claim 1, further comprising adjusting the trailing edge position based on a desired distance between successive objects in the stream of objects.

7. The method of claim 1, wherein halting recording of the raw data comprises:

comparing the trailing edge position with conveyor position data that corresponds to the end of the scan range; and

halting recording of the raw data when the trailing edge position reaches the end of the scan range.

8. A scanning system, comprising:

a conveyor configured to convey a stream of objects through said scanning system;

a conveyor controller in communication with said conveyor;

a scanner;

a scan controller in communication with said scanner; and

a control system in communication with said conveyor controller and said scan controller, said control system configured to;

mark a leading edge position of an object in the stream of objects;

perform a scan of the object to acquire data using said scan controller when the leading edge position reaches a start of a scan range;

mark a trailing edge position of the object;

issue a halt command to said scan controller in order to stop the scan when the trailing edge position reaches an end of the scan range; and

generate a three-dimensional image of the object based on the data acquired during the scan.

9. The scanning system of claim 8, wherein said control system comprises a sensor and a motion controller communicatively coupled to said sensor, said motion controller configured to:

detect when the leading edge of the object breaks a plane defined by a light beam emitted by said sensor;

mark the leading edge position;

detect when the trailing edge of the object breaks the plane defined by the light beam emitted by said sensor; and

mark the trailing edge position.

10. The scanning system of claim 9, wherein said motion controller is further configured to adjust at least one of the leading edge position and the trailing edge position based on a desired distance between successive objects in the stream of objects.

11. The scanning system of claim 9, wherein said control system further comprises a detector controller communicatively coupled to said conveyor controller and said motion controller, said detector controller configured to:

receive conveyor position data from said conveyor controller;

receive the leading edge position and the trailing edge position from said motion controller;

compare each of the leading edge position and the trailing edge position with the conveyor position data;

generate a flag when the leading edge position matches a first conveyor position that corresponds to a first distance between said sensor and the start of the scan range; and

remove the flag when the trailing edge position matches a second conveyor position that corresponds to a second distance between said sensor and the end of the scan range.

12. The scanning system of claim 11, wherein said control system further comprises an acquisition controller communicatively coupled to said detector controller and said scan controller, said acquisition controller configured to:

receive the flag from said detector controller;

perform the scan of the object to acquire data using said scan controller when the flag is present;

issue the halt command to said scan controller in order to stop the scan when the flag is removed; and

generate the three-dimensional image of the object based on the data acquired during the scan.

13. The scanning system of claim 9, wherein said control system further comprises a detector controller communicatively coupled to said conveyor controller and said motion controller, said detector controller configured to receive conveyor position data from said conveyor controller.

14. The scanning system of claim 13, wherein said control system further comprises an acquisition controller communicatively coupled to said detector controller and said scan controller, said acquisition controller configured to:

receive conveyor position data from said detector controller;

receive the leading edge position and the trailing edge position from said motion controller;

compare each of the leading edge position and the trailing edge position with the conveyor position data;

perform the scan of the object to acquire data using said scan controller when the leading edge position matches a first conveyor position that corresponds to a first distance between said sensor and the start of the scan range;

issue the halt command to said scan controller in order to stop the scan when the trailing edge position matches a second conveyor position that corresponds to a second distance between said sensor and the end of the scan range; and

generate the three-dimensional image of the object based on the data acquired during the scan.

15. The scanning system of claim 9, wherein said control system further comprises an acquisition controller communicatively coupled to said conveyor controller, said scan controller, and said motion controller, said acquisition controller configured to:

receive conveyor position data from said conveyor controller;

receive the leading edge position and the trailing edge position from said motion controller;

compare each of the leading edge position and the trailing edge position with the conveyor position data;

perform the scan of the object to acquire data using said scan controller when the leading edge position matches a first conveyor position that corresponds to a first distance between said sensor and the start of the scan range;

issue the halt command to said scan controller in order to stop the scan when the trailing edge position matches a second conveyor position that corresponds to a second distance between said sensor and the end of the scan range; and

generate the three-dimensional image of the object based on the data acquired during the scan.

16. A scanning system, comprising:

a conveyor configured to convey a stream of objects through said scanning system;

a conveyor controller operatively coupled to said conveyor;

a scanner;

a scan controller operatively coupled to said scanner;

a motion controller communicatively coupled to a sensor, said motion controller configured to;

mark a leading edge position of an object within the stream of objects when the leading edge of the object breaks a plane defined by a light beam emitted by said sensor;

mark a trailing edge position of the object when the trailing edge of the object breaks the plane defined by the light beam emitted by said sensor; and

an acquisition controller communicatively coupled to said motion controller and operatively coupled to said scan controller, said acquisition controller configured to;

perform a scan of the object to acquire data using said scan controller when the leading edge position reaches a start of a scan range;

issue a halt command to said scan controller in order to stop the scan when the trailing edge position reaches an end of the scan range; and

generate a three-dimensional image of the object based on data acquired during the scan.

17. The scanning system of claim 16, further comprising a detector controller communicatively coupled to said motion controller and said acquisition controller, said detector controller configured to:

receive conveyor position data from said conveyor controller;

receive the leading edge position and the trailing edge position from said motion controller;

compare each of the leading edge position and the trailing edge position with a respective first conveyor position and second conveyor position, the first conveyor position corresponding to a first distance between said sensor and the start of the scan range, the second conveyor position corresponding to a second distance between said sensor and the end of the scan range;

generate a flag when the leading edge position matches the first conveyor position; and

remove the flag when the trailing edge position matches the second conveyor position.

18. The scanning system of claim 17, wherein said acquisition controller is further configured to:

receive the flag from said detector controller;

perform the scan of the object to acquire data using said scan controller when the flag is present;

issue the halt command to said scan controller in order to stop the scan when the flag is removed; and

generate the three-dimensional image of the object based on the data acquired during the scan.

19. The scanning system of claim 16, further comprising a detector controller communicatively coupled to said motion controller and said acquisition controller, said detector controller configured to receive conveyor position data from said conveyor controller, said acquisition controller further configured to:

receive the conveyor position data from said detector controller;

receive the leading edge position and the trailing edge position from said motion controller;

compare each of the leading edge position and the trailing edge position with a respective first conveyor position and second conveyor position, the first conveyor position corresponding to a first distance between said sensor and the start of the scan range, the second conveyor position corresponding to a second distance between said sensor and the end of the scan range;

perform the scan of the object to acquire raw data using said scan controller when the leading edge position matches the first conveyor position;

issue the halt command to said scan controller in order to stop the scan when the trailing edge position matches the second conveyor position; and

generate the three-dimensional image of the object based on the data acquired during the scan.

20. The scanning system of claim 16, wherein said acquisition controller is further configured to:

receive conveyor position data from said conveyor controller;

receive the leading edge position and the trailing edge position from said motion controller;

compare each of the leading edge position and the trailing edge position with a respective first conveyor position and second conveyor position, the first conveyor position corresponding to a first distance between said sensor and the start of the scan range, the second conveyor position corresponding to a second distance between said sensor and the end of the scan range;

perform the scan of the object to acquire raw data using said scan controller when the leading edge position matches the first conveyor position;

issue the halt command to said scan controller in order to stop the scan when the trailing edge position matches the second conveyor position; and

generate the three-dimensional image of the object based on the data acquired during the scan.