Digital-imaging based code symbol reading system having finger-pointing triggered mode of operation

• US 8,490,877 B2
• Filed: 11/09/2010
• Issued: 07/23/2013
• Est. Priority Date: 11/09/2010
• Status: Active Grant

• Current Assignee: Metrologic Instruments Incorporated (Honeywell International Inc.)
• Original Assignee: Metrologic Instruments Incorporated (Honeywell International Inc.)
• Inventors: Kearney, Sean Philip
• Primary Examiner(s): Le, Thien M
• Assistant Examiner(s): TAYLOR, APRIL ALICIA
• Application Number:
  US12/942,154
• Publication Number:
  US 20120111945A1
• Time in Patent Office: 987 Days
• Field of Search: 235/454, 23546201-46245, 23547201-47203
• US Class Current: 235/462.45
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning
• CPC Class Codes: G06K 7/10881 constructional details of hand-held scanners
• CPC Class Codes: G06K 7/10891 the scanner to be worn on a finger or on a wrist
• CPC Class Codes: G06K 7/1443 locating of the code in an image

Abstract

A digital-imaging based system for and method of reading graphical indicia, including code symbols, on objects such as, but not limited to, code symbol menus by the user simply pointing his or her finger at the particular code symbol on the code symbol menu to be read, while digital images of the code symbol menu and the pointing finger are automatically captured, buffered and processed.

Claims

1. A digital-imaging based code symbol reading system comprising:

an automatic finger-pointing triggered mode of operation;

a housing having a light transmission aperture;

an image formation and detection subsystem, disposed in said housing, having image formation optics for producing and projecting a field of view (FOV) through said light transmission aperture and onto an area-type image detection array for detecting 2D digital images of an object present within said FOV, during object illumination and imaging operations;

an illumination subsystem, disposed in said housing, including an illumination array for producing a field of illumination within said FOV, and illuminating said object detected in said FOV, so that said illumination reflects off said object and is transmitted back through said light transmission aperture and onto said image detection array to form said 2D digital image of said object;

an image capturing and buffering subsystem, disposed in said housing, for capturing and buffering 2D digital images detected by said image formation and detection subsystem;

a digital image processing subsystem for processing said one or more 2D digital images captured and buffered by said image capturing and buffering subsystem and reading 1D and 2D code symbols represented therein, during said automatic finger-pointing triggered mode of operation;

wherein said digital image processing subsystem includes a pointing finger recognition and movement detection module, for automatically processing captured digital images buffered by said image capture and buffering subsystem, and supporting image processing operations required said automatic finger-pointing triggered mode of operation including automatically detecting the presence of a user'"'"'s pointing finger and a region of interest (ROI) to which the finger is pointing, so that pixels in said ROI can be processed in order to read a code symbol graphically represented by the pixel data contained in said ROI;

an input/output subsystem, disposed in said housing, for outputting processed image data to an external host system or other information receiving or responding device; and

a system control subsystem, disposed in said housing, for controlling and/or coordinating said subsystems during object detection, illumination and imaging operations.

2. The digital-imaging based code symbol reading system of claim 1, wherein said illumination subsystem comprises an array of LEDs.

3. The digital-imaging based code symbol reading system of claim 1, wherein said object is a code symbol menu on which a plurality of code symbols is printed.

4. The digital-imaging based code symbol reading system of claim 1, which further comprises an automatic object detection subsystem, disposed in said housing, for automatically detecting the presence of said object present within said FOV.

5. The digital-imaging based code symbol reading system of claim 1, wherein said housing is a hand-supportable housing, and wherein during said automatic finger-pointing triggered mode of operation, the user picks up said hand-supportable housing, and moves said hand-supportable housing in proximity with an object bearing a code symbol, and said object is automatically detected, causing the object in said FOV to be illuminated with LED-based illumination while digital images thereof are captured in a video mode, and buffered by said image capturing and buffering subsystem and processed by said digital image processing subsystem in effort to detect the presence of the user'"'"'s pointing finger and said ROI to which the finger is pointing, so that pixels in said ROI can be processed in order to read a code symbol graphically represented by the pixel data contained in said ROI.

6. The digital-imaging based code symbol reading system of claim 1, wherein during the automatic finger-pointing triggered mode of bar code symbol reading operation, the user presents the object within said FOV, and the object is automatically detected, causing the object in said FOV to be illuminated with LED-based illumination while digital images thereof are captured by said image capture and buffering subsystem in a video mode, and buffered by said image capturing and buffering subsystem and processed by said digital image processing subsystem in effort to detect (i) the presence of the user'"'"'s pointing finger, and (ii) said ROI to which the finger is pointing, so that pixels in said ROI can be processed in order to read a code symbol graphically represented by the pixel data contained in said ROI.

7. The digital-imaging based code symbol reading system of claim 1, wherein the user determines which bar code symbol on said object should be automatically read by said digital image processing subsystem by pointing his or her finger at the particular bar code symbol on said object which he or she intends to be read while digital images of the object are being captured, buffered and processed to recognize the pointing finger and region of interest close to the end points of the pointing finger recognized in said digital images.

8. The digital-imaging based code symbol reading system of claim 1, wherein the user points his or her finger at a code symbol on said object, while said digital image processing subsystem processes said digital images and automatically identifies the pointing finger within the captured digital image, locates said ROI adjacent the detected pointing finger, and decode processes said ROI to read the bar code symbol that is located adjacent to the detected pointing finger.

9. The digital-imaging based code symbol reading system of claim 1, wherein said pointing finger recognition and position detection module automatically detects a pause in the movement of the user'"'"'s pointing finger, and in response thereto, automatically detects said ROI to which the detected finger is pointing, and attempts to decode one or more code symbol graphically represented in the pixels contained said ROI.

10. The digital-imaging based code symbol reading system of claim 1, wherein after said digital image processing subsystem reads a first bar code symbol in a region of interest (ROI) to which the user points his or her finger, said pointing finger recognition and position detection module automatically detects the movement of the pointing finger in said FOV, and then said digital image processing subsystem reattempts to read another bar code symbol in another region of interest to which the pointing finger points.

11. The method of claim 1, wherein said code symbol is a code symbol selected from the group consisting of 1D bar code symbologies, 2D bar code symbologies, and data matrix symbologies.

12. The digital-imaging based code symbol reading system of claim 1, wherein said housing comprises a hand-supportable housing.

13. A method of recognizing graphical indicia on an object using a digital imaging system having a finger-pointing triggered mode of operation, said method comprising the steps of:

(a) providing a digital imaging system having a housing with a light transmission aperture, and first subsystem for capturing and buffering 2D digital images of an object within a field of view (FOV) defined relative to said housing, and a second subsystem for processing one or more of said 2D digital images during said finger-pointing triggered mode of operation, so as to detect the presence of a pointing finger and the region of interest (ROI) to which the finger is pointing, so that pixels in said ROI can be processed in order to recognize graphical content graphically represented by the pixel data contained in said ROI;

(b) moving said digital imaging system in proximity with an object bearing graphical content so that said object is located within said FOV; and

(c) pointing ones finger to particular graphical content on said object while said first subsystem captures and buffers digital images of said object in said FOV and said second subsystem processes said digital images so to detect the presence of the pointing finger and said ROI to which the finger is pointing, so that pixels in said ROI can be processed in order to recognize the graphical indicia graphically represented by the pixel data contained in said ROI.

14. The method of claim 13, wherein said graphical content is a graphical indicia selected from the group consisting of machine-readable indicia, dataform, and graphically-encoded form of intelligence, including, but not limited to bar code symbols, alphanumeric character recognition strings, handwriting, and diverse dataforms.

15. The method of claim 13, wherein said object is a document supporting multiple items of graphical indicia each being recognizable as an item of graphical intelligence.

16. The method of claim 13, wherein said object is a bar code symbol menu supporting multiple bar code symbols.

17. The method of claim 13, wherein the finger-pointing triggered mode of operation is an automatic finger-pointing triggered mode of operation and the second subsystem automatically detects the presence of a pointing finger and the region of interest (ROI) to which the finger is pointing.

18. A digital-imaging based graphical indicia recognition system comprising:

an automatic finger-pointing triggered mode of operation;

a housing having a light transmission aperture;

an image formation and detection subsystem, disposed in said housing, having image formation optics for producing and projecting a field of view (FOV) through said light transmission aperture and onto an area-type image detection array for detecting 2D digital images of an object present within said FOV, during object illumination and imaging operations;

an illumination subsystem, disposed in said housing, including an illumination array for producing a field of illumination within said FOV, and illuminating said object detected in said FOV, so that said illumination reflects off said object and is transmitted back through said light transmission aperture and onto said image detection array to form said 2D digital image of said object;

an image capturing and buffering subsystem, disposed in said housing, for capturing and buffering 2D digital images detected by said image formation and detection subsystem;

a digital image processing subsystem for processing said one or more 2D digital images captured and buffered by said image capturing and buffering subsystem and reading 1D and 2D code symbols represented therein, during said automatic finger-pointing triggered mode of operation;

wherein said digital image processing subsystem includes a pointing finger recognition and movement detection module, for automatically processing captured digital images buffered by said image capture and buffering subsystem, and supporting image processing operations required said automatic finger-pointing triggered mode of operation including automatically detecting presence of a user'"'"'s pointing finger and a region of interest (ROI) to which the finger is pointing, so that pixels in said ROI can be processed in order to read an item of graphical indicia graphically represented by the pixel data contained in said ROI;

an input/output subsystem, disposed in said housing, for outputting processed image data to an external host system or other information receiving or responding device; and

a system control subsystem, disposed in said housing, for controlling and/or coordinating said subsystems during object detection, illumination and imaging operations.

19. The digital-imaging based graphical indicia recognition system of claim 18, wherein said illumination subsystem comprises an array of LEDs.

20. The digital-imaging based graphical indicia recognition system of claim 18, wherein said object is a code symbol menu on which a plurality of code symbols is printed.

21. The digital-imaging based graphical indicia recognition system of claim 18, wherein said graphical content is a graphical indicia selected from the group consisting of machine-readable indicia, dataform, and graphically-encoded form of intelligence, including, but not limited to bar code symbols, alphanumeric character recognition strings, handwriting, and diverse dataforms.

22. The digital-imaging based code symbol reading system of claim 18, which further comprises an automatic object detection subsystem, disposed in said housing, for automatically detecting the presence of said object present within said FOV.

23. The digital-imaging based code symbol reading system of claim 18, wherein said housing comprises a hand-supportable housing.