Tunnel-type digital imaging system for use within retail shopping environments such as supermarkets

• US 7,584,893 B2
• Filed: 10/30/2007
• Issued: 09/08/2009
• Est. Priority Date: 03/24/1998
• Status: Expired due to Fees

• Current Assignee: Metrologic Instruments Incorporated (Honeywell International Inc.)
• Original Assignee: Metrologic Instruments Incorporated (Honeywell International Inc.)
• Inventors: Zhu, Xiaoxun, Good, Timothy A., Knowles, C. Harry, Au, Ka Man, Ghosh, Sankar, Kolis, George, Colavito, Stephen J., Amundsen, Thomas, Vatan, Pirooz, Naylor, Charles A., Defoney, Shawn, Skypala, Edward, Schwartz, Barry E., Jankevics, Andrew, Schnee, Michael D., Wilz, David W. Sr., Blake, Robert, Tsikos, Constantine J., Giordano, Patrick A., Yorsz, Jeffery, Wirth, Allan, Kim, Steven Y., Dobbs, Russell Joseph, Svedas, William, Fisher, Dale, Schmidt, Mark C., Tassell, Jon Van
• Primary Examiner(s): LE, THIEN MINH
• Application Number:
  US11/980,074
• Publication Number:
  US 20080128507A1
• Time in Patent Office: 679 Days
• Field of Search: 23546201-46247, 235/472.01, 235/472.02, 235/472.03, 235/454, 235/455
• US Class Current: 235/462.42
• CPC Class Codes: G06K 7/10732 Light sources

Abstract

A tunnel-type digital imaging system for use within retail shopping environments such as supermarkets. The system includes a tunnel configuration arranged about a conveyor structure for transporting objects therethrough, and an image capturing and processing subsystem embodied within the tunnel configuration, for generating a 3D digital imaging volume above the conveyor structure and within the tunnel configuration, for capturing digital 1D images of objects transported through the 3D digital imaging volume. The image capturing and processing subsystem includes a plurality of illumination and imaging stations. Each station includes a 2D imaging array having optics providing a 3D field of view (FOV) on the 2D imaging array that is projected and extends into the 3D digital imaging volume, and one or more light emitting devices configured together to produce an illumination beam that extends into the 3D FOV of the 2D imaging array. A digital image processing subsystem processing digital 1D images of objects passing through the 3D digital imaging volume, and a system control subsystem which controls and/or orchestrates the coplanar illumination and imaging subsystems during system operation.

Claims

1. A tunnel-type digital imaging system for use within retail shopping environments such as supermarkets, said tunnel-type digital imaging system comprising:

a tunnel configuration arranged about a conveyor structure for transporting objects through said tunnel configuration; and

an image capturing and processing subsystem embodied within said tunnel configuration, and supporting a 3D digital imaging volume above said conveyor structure and within said tunnel configuration, for capturing linear digital 1D images of objects transported through said 3D digital imaging volume;

wherein said image capturing and processing subsystem includes a plurality of illumination and imaging subsystems,

wherein each said illumination and imaging subsystem generates a light illumination beam and 3D field of view (FOV) that are projected into said 3D digital imaging volume for imaging of objects passing through said 3D digital imaging volume and generating linear digital 1D images of each said object intersecting with one or more of said 3D FOVs; and

a digital image processing subsystem for processing said linear digital 1D images of objects passing through said 3D digital imaging volume; and

a system control subsystem for controlling and/or orchestrating said illumination and imaging subsystems during system operation;

wherein each said illumination and imaging subsystem includes one or more coherent light sources, and said plurality of light illumination beams are generated by said one or more coherent light sources; and

wherein each said illumination and imaging subsystem further includes a despeckling mechanism for substantially reducing the coherence of said light illumination beam so as to substantially reduce speckle-pattern noise power observed in said captured linear digital 1D images.

2. The tunnel-type digital imaging system of claim 1, wherein said one or more coherent light sources comprises one or more visible laser diodes (VLDs).

3. The tunnel-type digital imaging system of claim 1, wherein said digital image processing subsystem processes said linear digital 1D images so as to read one or more bar code symbols on said objects, and generate symbol character data for each read bar code symbol.

4. The tunnel-type digital imaging system of claim 1, which further comprises an electronic weigh scale disposed along said conveyor structure for weighing said objects that are automatically identified by said digital imaging operations within said tunnel configuration.

5. The tunnel-type digital imaging system of claim 1, which further comprises an object dimensioning subsystem for dimensioning objects that are automatically identified by said digital imaging operations conducted within said tunnel configuration.

6. The tunnel-type digital imaging system of claim 1, which further comprises a data element management subsystem for managing and linking data elements associated with the identity of objects imaged within said tunnel configuration, and other data elements selected from the group consisting of object dimension data element and object weight data element.

7. A tunnel-type digital imaging system for use within retail shopping environments such as supermarkets, said tunnel-type digital imaging system comprising:

a tunnel configuration arranged about a conveyor structure for transporting objects through said tunnel configuration; and

an image capturing and processing subsystem embodied within said tunnel configuration, and supporting a 3D digital imaging volume above said conveyor structure and within said tunnel configuration, for capturing digital 1D images of objects transported through said 3D digital imaging volume;

wherein said image capturing and processing subsystem includes a plurality of illumination and imaging subsystems,

wherein each said illumination and imaging subsystem generates a light illumination beam and 3D field of view (FOV) that are projected into said 3D digital imaging volume for imaging of objects passing through said 3D digital imaging volume and generating digital 1D images of each said object intersecting with one or more of said 3D FOVs; and

a digital image processing subsystem for processing said digital 1D images of objects passing through said 3D digital imaging volume; and

a system control subsystem for controlling and/or orchestrating said coplanar illumination and imaging subsystems during system operation;

wherein each said illumination and imaging subsystem produces at least one 3D FOV within a predetermined region of space contained within said 3D digital imaging volume;

wherein each said illumination and imaging subsystem includes a 2D image sensing array with optics providing said 3D FOV on said 2D image sensing array; and

wherein said plurality of 3D FOVs are projected through said 3D digital imaging volume so as to support omni-directional imaging of objects transported through said 3D digital imaging volume.

8. The tunnel-type digital imaging system of claim 7, wherein each said illumination and imaging subsystem automatically buffers captured digital 1D images and assembles these digital 1D images to construct digital 2D images of the object taken along said 3D FOV;

and wherein said digital image processing subsystem processes said 2D images to read one or more 1D and/or 2D code symbols graphically represented therein.

9. The tunnel-type digital imaging system of claim 7, which further comprises an object detection subsystem for automatically detecting the motion of each object that passes through said 3D digital imaging volume, and generating a control indication signal indicative of said detected object.

10. A tunnel-type digital imaging system for use within retail shopping environments such as supermarkets, said tunnel-type digital imaging system comprising:

a tunnel configuration arranged about a conveyor structure for transporting objects through said tunnel configuration; and

an image capturing and processing subsystem embodied within said tunnel configuration, and supporting a 3D digital imaging volume above said conveyor structure and within said tunnel configuration, for capturing digital 1D images of objects transported through said 3D digital imaging volume;

wherein said image capturing and processing subsystem includes a plurality of illumination and imaging stations;

wherein each illumination and imaging station includes

(i) a 2D imaging array having optics providing a 3D field of view (FOV) on said 2D imaging array that is projected and extends into said 3D digital imaging volume; and

(ii) one or more light emitting devices configured together to produce a illumination beam that extends into the 3D FOV of said 2D imaging array;

wherein said plurality of 3D FOVs project through and intersect within said 3D digital imaging volume, for imaging of objects passed through said 3D digital imaging volume and generating digital 1D images of each said object intersecting with one or more of said illumination beams;

a digital image processing subsystem for processing said digital 1D images of objects passing through said 3D digital imaging volume; and

a system control subsystem for controlling and/or orchestrating said coplanar illumination and imaging subsystems during system operation.

11. The tunnel-type digital imaging system of claim 10, wherein each said illumination and imaging subsystem includes one or more incoherent light sources, and said plurality of light illumination beams are generated by said one or more coherent light sources.

12. The tunnel-type digital imaging system of claim 11, wherein said one or more light sources comprises one or more visible laser diodes (VLDs).

13. The tunnel-type digital imaging system of claim 11, wherein each said illumination and imaging subsystem further comprises a despeckling mechanism for substantially reducing the coherence of said illumination beam so as to substantially reduce speckle-pattern noise power observed in said captured digital 1D images.

14. The tunnel-type digital imaging system of claim 10, wherein each said illumination and imaging subsystem includes one or more incoherent light sources, and said plurality of illumination beams are generated by said one or more incoherent light sources.

15. The tunnel-type digital imaging system of claim 14, wherein said array of incoherent light sources comprises an array of light emitting diodes (LEDs).

16. The tunnel-type digital imaging system of claim 10, wherein said digital image processing subsystem processes said digital 1D images so as to read one or more bar code symbols on said objects, and generate symbol character data for each read bar code symbol.

17. The tunnel-type digital imaging system of claim 10, wherein each said illumination and imaging subsystem produces at least one 3D FOV within a predetermined region of space contained within said 3D digital imaging volume.

18. The tunnel-type digital imaging system of claim 10, wherein said plurality of 3D FOVs are projected through said 3D digital imaging volume so as to provide omni-directional imaging coverage within said 3D digital imaging volume.

19. The tunnel-type digital imaging system of claim 10, which further comprises an object detection subsystem for automatically detecting the motion of each object that passes through said 3D digital imaging volume, and generating a control indication signal indicative of said detected object.

20. The tunnel-type digital imaging system of claim 10, which further comprises an electronic weigh scale disposed along said conveyor structure for weighing said objects that are automatically identified by said digital imaging operations within said tunnel configuration.

21. The tunnel-type digital imaging system of claim 10, which further comprises an object dimensioning subsystem for dimensioning objects that are automatically identified by said digital imaging operations conducted within said tunnel configuration.

22. The tunnel-type digital imaging system of claim 10, which further comprises a data element management subsystem for managing and linking data elements associated with the identity of objects imaged within said tunnel configuration, and other data elements selected from the group consisting of object dimension data element and object weight data element.