Digital image capturing and processing system employing coplanar illumination and imaging stations which generate coplanar illumination and imaging planes only when and where an object is being moved within the 3D imaging volume

• US 7,533,820 B2
• Filed: 02/27/2007
• Issued: 05/19/2009
• Est. Priority Date: 11/24/2000
• Status: Expired due to Fees

• Current Assignee: Metrologic Instruments Incorporated (Honeywell International Inc.)
• Original Assignee: Metrologic Instruments Incorporated (Honeywell International Inc.)
• Inventors: Zhu, Xiaoxun, Veksland, Michael, Knowles, C. Harry, Xian, Tao, Good, Timothy
• Primary Examiner(s): Kim; Ahshik
• Application Number:
  US11/711,858
• Publication Number:
  US 20070210165A1
• Time in Patent Office: 812 Days
• Field of Search: 235/462.11, 235/462.01, 235/462.09, 235/462.42, 235/462.43
• US Class Current: 235/462.11
• CPC Class Codes: G06K 2207/1012 Special detection of object
• CPC Class Codes: G06K 7/10693 for omnidirectional scanning
• CPC Class Codes: G06K 7/10712 Fixed beam scanning
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning
• CPC Class Codes: G06K 7/10732 Light sources
• CPC Class Codes: G06K 7/10851 Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device basic electronic circuitry H03
• CPC Class Codes: G06Q 20/20 Point-of-sale [POS] network systems
• CPC Class Codes: G06Q 20/202 Interconnection or interaction of plural electronic cash registers [ECR] or to host computer, e.g. network details, transfer of information from host to ECR or from ECR to ECR
• CPC Class Codes: G06Q 20/203 Inventory monitoring
• CPC Class Codes: G06Q 20/208 Input by product or record sensing, e.g. weighing or scanner processing
• CPC Class Codes: G06Q 20/209 Specified transaction journal output feature, e.g. printed receipt or voice output
• CPC Class Codes: G06Q 30/06 Buying, selling or leasing transactions
• CPC Class Codes: G06V 10/141 Control of illumination

Abstract

A digital image capturing and processing system comprising a plurality of coplanar illumination and imaging stations for producing a plurality of coplanar linear illumination and imaging planes which intersect within a 3D imaging volume defined relative to an imaging window. Each station includes an array of planar illumination modules (PLIMs) for producing at least one substantially planar illumination beam (PLIB), and a linear image detection array having a field of view (FOV) on the linear image detection array and extending in substantially the same plane as the PLIB, to provide a coplanar illumination and imaging plane (PLIB/FOV). The PLIB/FOV is projected through the 3D imaging volume, for capturing linear (1D) digital images of an object passing therethrough, for subsequent processing and recognition of information graphically represented in the linear digital images. The system includes an automatic object motion detection subsystem for automatically determining when and where an object is being moved through the 3D imaging volume, and a control subsystem for selectively activating illumination sources in only those PLIMs in particular coplanar illumination and imaging stations when an object is being moved within the FOV thereof. By virtue of the present invention, it is possible to minimize the illumination of human beings who might be present along the lines of projected coplanar illumination and imaging planes during the operation of system, at point-of-sale (POS) stations and like retail environments.

Claims

1. A digital image capturing and processing system comprising:

a system housing having an imaging window;

a plurality of coplanar illumination and imaging stations, disposed within said system housing, and wherein each said coplanar illumination and imaging station includes

(i) an array of planar illumination modules (PLIMs) for producing a substantially planar illumination beam (PLIB), wherein each said PLIM includes at least one illumination source and optics for producing said PLIB, and

(ii) a linear image detection array having a field of view (FOV) on said linear image detection array and extending in substantially the same plane as said PLIB, and providing a coplanar illumination and imaging plane (PLIB/FOV) that is projected through a 3D imaging volume defined relative to said imaging window, for capturing linear (1D) digital images of the object passing therethrough, for subsequent processing and recognition of information graphically represented in said linear digital images; and

an automatic object motion detection subsystem, disposed within said system housing, for automatically determining when and where an object is being moved through said 3D imaging volume; and

a control subsystem for selectively activating illumination sources in only those PLIMs in particular coplanar illumination and imaging stations and when an object is being moved within the FOV thereof, so as to minimize the illumination of human beings who might be present along the lines of projected coplanar illumination and imaging planes during the operation of said system.

2. The digital image capturing and processing system of claim 1, wherein said automatic object motion detection subsystem comprises an imaging-based motion sensor deployed in or at each said coplanar illumination and imaging station.

3. The digital image capturing and processing system of claim 2, wherein said imaging-based motion sensor employs said array of PLIMs at said coplanar illumination and imaging station, operated at a lower operating power, to illumination objects while said system is operating in an object motion detection mode.

4. The digital image capturing and processing system of claim 2, wherein said imaging-based motion sensor employs an IR illumination source for illuminating the FOV of said imaging-based motion sensor while said system is operating in an object motion detection mode.

5. The digital image capturing and processing system of claim 2, wherein said object motion sensor is also capable of determining the velocity of objects moving though the field of view (FOV) of a particular one of said coplanar illumination and imaging stations, and automatically controlling the frequency at which pixel data, associated of captured linear images, is transferred out of said linear image sensing array and into a buffer memory in said coplanar illumination and imaging station.

6. The digital image capturing and processing system of claim 2, wherein at each said coplanar illumination and imaging station, a pair of PLIMs are mounted about an image formation and detection module including said linear image detection array and optics providing the FOV of said station, and wherein one or more mirrors are used to direct the resulting coplanar illumination and imaging plane through said imaging window of said system.

7. The digital image capturing and processing system of claim 2, wherein each said coplanar illumination and imaging station supports an image generation and processing channel that receives frames of linear digital images from said linear image detection array and automatically buffers these linear digital images in video memory and automatically assembles these linear digital images to construct 2D digital images of the object taken along said FOV of said coplanar illumination and imaging plane associated with said coplanar illumination and imaging station.

8. The digital image capturing and processing system of claim 7, wherein said 2D digital images produced from said image generation and processing channels are managed by an image processing management processor programmed to optimize digital image processing flows.

9. The digital image capturing and processing system of claim 8, which supports intelligent image-based object recognition processes for automated recognition of objects.

10. The digital image capturing and processing system of claim 1, which further comprises one or more components selected from the group consisting of an integrated electronic weight scale, an RFID module, and a wireless data communication interface.

11. The digital image capturing and processing system of claim 1, having a below counter depth not to exceed 3.5″

(89 mm).

12. The digital image capturing and processing system of claim 11, wherein each said illumination source comprises an incoherent light source.

13. The digital image capturing and processing system of claim 12, wherein said linear array of incoherent light sources comprises a linear array of light emitting diodes (LEDs).

14. The digital image capturing and processing system of claim 1, wherein each said illumination source comprises a coherent light source.

15. The digital image capturing and processing system of claim 14, wherein said linear array of coherent light sources comprises a linear array of visible laser diodes (VLDs).

16. The digital image capturing and processing system of claim 1, wherein said linear image detection array comprises an imaging array selected from the group of a CMOS image sensing array and a CCD image sensing array.

17. The digital image capturing and processing system of claim 1, wherein said subsequent processing and recognition of information graphically represented in said linear digitals images comprises buffering a series of said linear digital images and composing area-type (2D) digital images of said object, and subsequently processing said area-type digital images so as to recognize information graphically represented in said area-type digital images.

18. The digital image capturing and processing system of claim 17, wherein said subsequent processing and recognition of information graphically represented in said area-type digital images comprises decode processing said area-type digital images so as to read one or more code symbols graphically represented in said area-type digital images.

19. The digital image capturing and processing system of claim 18, wherein said one or more code symbols comprise one or more bar code symbols selected from the group consisting of 1D bar code symbols, 2D bar code symbols and data matrix type bar code symbols.

20. The digital image capturing and processing system of claim 1, wherein said control subsystem comprises a global control subsystem controlling all said coplanar illumination and imaging stations.