Digital image capturing and processing system employing a plurality of coplanar illuminating and imaging stations projecting a plurality of coplanar illumination and imaging planes into a 3D imaging volume, and controlling operations therewithin using control data derived from motion data collected from the automated detection of objects passing through said 3D imaging volume

• US 7,533,823 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, Knowles, C. Harry, Xian, Tao, Good, Timothy
• Primary Examiner(s): Kim; Ahshik
• Application Number:
  US11/711,870
• Publication Number:
  US 20070262150A1
• Time in Patent Office: 812 Days
• Field of Search: 235/462.01, 235/462.09, 235/462.31, 235/462.41, 235/462.42
• US Class Current: 235/462.42
• 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. An object motion detection subsystem for automatically detecting the motion of an object passing through the 3D imaging volume, and generating motion data representative of the detected object motion. Each station includes an illumination subsystem having a linear illumination array including a plurality of light emitting devices for producing a substantially planar illumination beam (PLIB), and (ii) an image formation and detection subsystem including a linear image sensing array having optics providing a field of view (FOV) on the linear image detection array, and extending substantially along the PLIB. Each station produces at least one coplanar illumination and imaging plane (PLIB/FOV) which is projected through the imaging window and into the 3D imaging volume, for capturing linear (1D) digital images of objects moving through the 3D imaging volume. Each station also includes an automatic illumination control subsystem for controlling the production of illumination by the illumination subsystem into the 3D imaging volume, as an object is detected moving within the 3D imaging volume. Within each station, an image capturing and buffering subsystem captures and buffers linear digital images produced from the linear image detection array, and a local control subsystem controls operations within the coplanar illumination and imaging station using control data derived from motion data generated by the object motion detection subsystem.

Claims

1. A digital image capturing and processing system comprising:

a system housing having an imaging window;

a complex of coplanar illuminating and imaging stations, disposed within said system housing, for generating plurality of coplanar illumination and imaging planes (PLIB/FOVs) that are projected through said imaging window and into a 3D imaging volume definable relative to said imaging window; and

an object motion detection subsystem for automatically detecting the motion of an object passing through said 3D imaging volume, and generating motion data representative of said detected object motion within said 3D imaging volume;

wherein each said coplanar illumination and imaging station includes

(i) an illumination subsystem having a linear illumination array including a plurality of light emitting devices for producing a planar illumination beam (PLIB), and

(ii) an image formation and detection subsystem including a linear image detection array having optics providing a field of view (FOV) on said linear image detection array, and extending substantially along said PLIB so as to form one said coplanar illumination and imaging plane (PLIB/FOV) that is projected through said imaging window and into said 3D imaging volume, for capturing linear (1D) digital images of objects moving through said 3D imaging volume, and subsequent processing to read information graphically represented in said linear digital images;

(iii) an automatic illumination control subsystem for controlling the production of illumination by said illumination subsystem into said 3D imaging volume, as objects are detected moving within said 3D imaging volume;

(iv) an image capturing and buffering subsystem for capturing and buffering linear digital images from said linear image detection array; and

(v) a local control subsystem for controlling operations within said coplanar illumination and imaging station using control data derived from said motion data generated by said object motion detection subsystem.

2. The digital image capturing and processing system of claim 1, wherein said object motion detection subsystem comprises a plurality of imaging-based motion detectors deployed within said system, for detecting the presence and motion of objects within said 3D imaging volume.

3. The digital image capturing and processing system of claim 2, wherein each said imaging-based motion detector comprises an area-type image acquisition subsystem and an embedded digital signal processing (DSP) chip to support high-speed digital image capture and processing operations required for real-time object motion detection in said system.

4. The digital image capturing and processing system of claim 2, wherein each said imaging-based motion detector comprises a linear-type image acquisition subsystem and an embedded digital signal processing (DSP) chip to support high-speed digital image capture and processing operations required for real-time object motion detection in said system.

5. The digital image capturing and processing system of claim 1, wherein said object motion detection subsystem comprises at least one IR-based LIDAR subsystem having an embedded digital signal processing (DSP) chip to support high-speed digital image capture and processing operations required for real-time object motion detection in said system.

6. The digital image capturing and processing system of claim 1, wherein said object motion detection subsystem comprises a plurality of IR-based object motion sensors each having an IR LED and optics for producing an amplitude modulated (AM) IR light beam within said 3D imaging volume, and an IR photodiode for synchronously detecting the IR light beam reflected from an object within said 3D imaging volume.

7. The digital image capturing and processing system of claim 1, wherein said object motion detection subsystem comprises one or more imaging-based motion detectors, each said imaging-based motion detector being deployed at one said coplanar illuminating and imaging station, for detecting the presence and motion of objects within said 3D imaging volume.

8. The digital image capturing and processing system of claim 7, wherein said imaging-based motion detector comprises an area-type image acquisition subsystem and an embedded digital signal processing (DSP) chip to support high-speed digital image capture and processing operations required for real-time object motion detection in said system.

9. The digital image capturing and processing system of claim 7, wherein said imaging-based motion detector comprises a linear-type image acquisition subsystem and an embedded digital signal processing (DSP) chip to support high-speed digital image capture and processing operations required for real-time object motion detection in said system.

10. The digital image capturing and processing system of claim 1, wherein said object motion detection subsystem comprises an IR-based LIDAR subsystem deployed at each said coplanar illuminating and imaging station, and having an embedded digital signal processing (DSP) chip to support high-speed digital image capture and processing operations required for real-time object motion detection at said coplanar illuminating and imaging station.

11. The digital image capturing and processing system of claim 1, wherein said object motion detection subsystem comprises an IR-based object motion detector deployed at each said coplanar illuminating and imaging station, and having an IR LED and optics for producing an amplitude modulated (AM) IR light beam within said 3D imaging volume, and an IR photodiode for synchronously detecting reflected from objects within said 3D imaging volume.

12. The digital image capturing and processing system of claim 1, wherein said plurality of light emitting devices comprises a linear array of incoherent light sources.

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

14. The digital image capturing and processing system of claim 1, wherein said plurality of light emitting devices comprises a linear array of coherent light sources.

15. The digital image capturing and processing system of claim 14, wherein said linear array of coherent light sources comprises an 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 image sensing 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 image capturing and buffering subsystem captures and buffers series of said linear digital images and composes area-type (2D) digital images of said object graphically representing information in said area-type digital images.

18. The digital image capturing and processing system of claim 17, which further comprises a digital image processing subsystem, cooperating with said image capturing and buffering subsystems, for processing said area-type digital images of said object and recognizing information graphically represented in said area-type digital images.

19. The digital image capturing and processing system of claim 18, wherein said processing said area-type digital images of said object 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.

20. The digital image capturing and processing system of claim 19, 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.