System operative for processing frame having representation of substrate

• US 8,381,984 B2
• Filed: 03/31/2010
• Issued: 02/26/2013
• Est. Priority Date: 03/31/2010
• Status: Active Grant

• Current Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Original Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Inventors: Li, Jingquan, Meier, Timothy P., Hussey, Robert M.
• Primary Examiner(s): Frech, Karl D
• Application Number:
  US12/751,560
• Publication Number:
  US 20110240742A1
• Time in Patent Office: 1,063 Days
• Field of Search: 235/462.11, 235/462.08, 235/462.1, 235/462.24, 235/462.41
• US Class Current: 235/462.11
• CPC Class Codes: G06K 7/1443 locating of the code in an image
• CPC Class Codes: G06K 7/1447 extracting optical codes from image or text carrying said optical code

Abstract

A system having an image sensor array can be provided for use in locating and decoding a bar code symbol represented within a frame of image data. An image sensor array can be incorporated in a terminal having a hand held housing. A terminal can be operative to capture a frame and locate a feature of a document represented within the frame, the document of a type having a bar code symbol at a predetermined location. The system can determine a location of a bar code symbol representation within an image representation. For determining a location of the bar code symbol representation in an image representation, the system can be operative to utilize pre-stored information respecting the document and the determined location of the document feature representation, the pre-stored information indicating a location of the bar code symbol in a document of the document type subject to image capture.

Claims

1. A system for use in reading a bar code symbol disposed on a document;

a terminal having an image sensor array comprising a plurality of pixels, the terminal having a lens assembly for use in focusing an image onto the two dimensional image sensor array, and a hand held housing incorporating the image sensor array, wherein the terminal is operative for capture of a frame of image data responsively to an initiation of a trigger signal by an operator, the frame of image data having a representation of the document, and further having a representation of the bar code symbol;

a memory;

pre-stored information respecting one or more document types stored in the memory, each document type having an associated bar code symbol, the pre-stored information including information respecting a bar code symbol position within a document of a known document type;

wherein the system is operative for locating a document feature representation within the representation of the document, the document feature representation corresponding to a document feature other than the bar code symbol;

wherein the system is further operative for determining a document type based on the document feature representation;

wherein the system is further operative for utilizing the location of the document feature representation determined by the system and the pre-stored information corresponding to the document type to determine the location of a bar code symbol representation in the frame, the bar code symbol representation corresponding to the bar code symbol; and

wherein the system is further operative to utilize image data of the determined location of the bar code symbol representation for attempting to decode the bar code symbol.

2. The system of claim 1, wherein the frame of image data is verbatim the frame of image data subject to processing for determining a location of a feature representation.

3. The system of claim 1, wherein the document feature representation is a text block representation.

4. The system of claim 1, wherein the document feature representation is a text block representation, and wherein the system locates the text block representation by way of a process including calculating auto-correlation scores for a plurality of sampling paths.

5. The system of claim 1, wherein the system includes the terminal and at least one server external to the terminal and wherein the terminal is operative for attempting to decode the bar code symbol.

6. The system of claim 1, wherein the system is further operative for outputting a transformed representation of the document, the transformed representation correcting for distortion in the frame of image data.

7. The system of claim 1, wherein the feature representation is at least one edge of the document.

8. The system of claim 1, wherein the system includes an external server external to the terminal, and wherein the external server is operative to receive the frame from the terminal and subject the frame to distortion correction processing in which there is corrected distortion resulting from an imaging axis of the terminal being at a non-perpendicular angle relative to the document during capture.

9. The system of claim 8, wherein the external server is operative to subject the frame to distortion correction during a time period that the terminal subjects the frame to an attempt to decode a bar code symbol.

10. The system of claim 8, wherein the external server is operative to subject the frame to distortion correction during a time period that the terminal subjects a subsequent frame to an attempt to decode a bar code symbol.

11. A system for use in reading a bar code symbol disposed on a substrate;

a terminal having an image sensor array comprising a plurality of pixels, the terminal having a lens assembly for use in focusing an image onto the two dimensional image sensor array, and a hand held housing incorporating the image sensor array, wherein the terminal is operative for capture of a frame of image data responsively to an initiation of a trigger signal by an operator, the frame of image data having a representation of the substrate, and further having a representation of the bar code symbol;

an external server external to the terminal;

wherein the terminal is operative to transmit the frame to the external server;

wherein the terminal is further operative to subject the frame to an attempt to decode a bar code symbol with the frame being in a state in which distortion of the frame attributable to an imaging axis of the terminal being at a non-perpendicular angle relative to the substrate during capture of the frame is not corrected;

wherein the external server is operative to receive the frame and subject the frame to distortion correction processing in which there is corrected distortion resulting from an imaging axis of the terminal being at a non-perpendicular angle relative to the document during capture.

12. The system of claim 11, wherein the external server is operative to subject the frame to distortion correction during a time period that the terminal subjects the frame to an attempt to decode a bar code symbol with the frame being in the state in which distortion of the frame attributable to an imaging axis of the terminal being at a non-perpendicular angle relative to the substrate during capture of the frame is not corrected.

13. The system of claim 11, wherein the external server is operative to subject the frame to distortion correction during a time period that the terminal subjects a subsequent frame to an attempt to decode a bar code symbol.

14. The system of claim 11, wherein the external server is further operative to transmit the frame in a distortion corrected state to the terminal after subjecting the frame to distortion correction processing in which there is corrected distortion resulting from an imaging axis of the terminal being at a non-perpendicular angle relative to the document during capture.

15. The system of claim 14, wherein the terminal is further operative to attempt to decode a bar code symbol utilizing the frame in a distortion corrected state responsively to receiving of the frame in a distortion corrected state from the external server.

16. The system of claim 11, wherein the external server is a local server.

17. The system of claim 11, wherein the external server is a remote server.