Systems and methods for selectively masking a scan volume of a data reader

• US 8,322,617 B2
• Filed: 02/02/2010
• Issued: 12/04/2012
• Est. Priority Date: 02/04/2009
• Status: Active Grant

• Current Assignee: Datalogic Adc, Inc. (Datalogic S.p.A.)
• Original Assignee: Datalogic Adc, Inc. (Datalogic S.p.A.)
• Inventors: Cherry, Craig Douglas
• Primary Examiner(s): FRANKLIN, JAMARA ALZAIDA
• Application Number:
  US12/698,410
• Publication Number:
  US 20100193588A1
• Time in Patent Office: 1,036 Days
• Field of Search: 235/462.01, 235/462.08, 235/462.12, 235/462.2, 235/462.42, 235/462.45, 235/454
• US Class Current: 235/454
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning
• CPC Class Codes: G06K 7/10861 sensing of data fields affixed to objects or articles, e.g. coded labels postal sorting B07C3/14, conveying articles B65G47/48
• CPC Class Codes: G06K 7/1093 sensing, after transfer of the image of the data-field to an intermediate store, e.g. storage with cathode ray tube
• CPC Class Codes: G06K 7/1443 locating of the code in an image
• CPC Class Codes: G06K 7/1456 determining the orientation of the optical code with respect to the reader and correcting therefore
• CPC Class Codes: G06V 30/2247 Characters composed of bars, e.g. CMC-7

Abstract

Systems and methods are provided for selectively reading and accepting optical codes within a scan volume of the data reader. A method of processing an optical code within the scan volume comprises acquiring, via the data reader, scan data including an image or scan of an optical code located within the scan volume of the data reader, processing the scan data for decodable data corresponding to the optical code, and determining whether to accept or reject the optical code based on a position within the scan volume of the optical code relative to a configurable exclusion zone. The determination of whether to accept or reject the optical code may be based on other conditions of the optical code, such as a position of the optical code within the depth of field of the data reader, a symbology type of the optical code, and data encoded in the optical code.

Claims

1. A method of processing an optical code within a scan volume of a data reader, comprising the steps of:

acquiring, via the data reader, scan data including an image or scan of an optical code located within the scan volume of the data reader, the scan volume having associated therewith a configurable exclusion zone that includes a first exclusion parameter defining a minimum amount of optical code overlap with the exclusion zone required to reject the optical code;

processing the scan data for decodable data corresponding to the optical code;

determining an extent to which the optical code overlaps with the exclusion zone;

determining whether the extent to which the optical code overlaps with the exclusion zone meets or exceeds the minimum amount of optical code overlap defined by the first exclusion parameter; and

if the extent to which the optical code overlaps with the exclusion zone does not meet or exceed the minimum amount of optical code overlap defined by the first exclusion parameter, reporting the acceptance of the optical code.

2. The method of claim 1 wherein the step of reporting the acceptance of the optical code is performed without regard to whether an aiming pattern projected into the scan volume intersects the optical code.

3. The method of claim 1 wherein the configurable exclusion zone includes a second exclusion parameter defining one or more optical code symbology types to reject and the step of reporting the acceptance of the optical code is not performed if a symbology type of the optical code corresponds to one of the optical code symbology types defined by the second exclusion parameter.

4. The method of claim 1 wherein the configurable exclusion zone includes a second exclusion parameter defining one or more optical codes to reject based on a data content of the optical code and the step of reporting the acceptance of the optical code is not performed if data encoded in the optical code corresponds to the data content of one or more of the optical codes defined by the second exclusion parameter.

5. The method of claim 1 wherein the configurable exclusion zone includes a second exclusion parameter indicating that an optical code having encoded therein a random-weight-item number-system-character is to be rejected and the step of reporting the acceptance of the optical code is not performed if the optical code includes a random-weight-item number-system-character.

6. The method of claim 1 wherein the configurable exclusion zone includes a second exclusion parameter indicating that an optical code having encoded therein a periodical number-system-character is to be rejected and the step of reporting the acceptance of the optical code is not performed if the optical code includes a periodical number-system-character.

7. The method of claim 1, further comprising:

determining a position within a depth of field of the data reader of the optical code and wherein the step of reporting the acceptance of the optical code is performed based on the position within the depth of field of the optical code.

8. The method of claim 1 wherein the minimum amount of optical code overlap defined by the first exclusion parameter comprises the entire optical code.

9. The method of claim 1 wherein the minimum amount of optical code overlap defined by the first exclusion parameter comprises at least half of the optical code.

10. The method of claim 1 wherein the minimum amount of optical code overlap defined by the first exclusion parameter comprises any portion of the optical code.

11. The method of claim 1 wherein the scan volume has associated therewith multiple configurable exclusion zones, a first one of the configurable exclusion zones includes a first exclusion parameter defining a first minimum amount of optical code overlap with the exclusion zone required to reject the optical code, and a second one of the configurable exclusion zones includes a second exclusion parameter defining a second minimum amount of optical code overlap with the exclusion zone required to reject the optical code.

12. The method of claim 11 wherein the first minimum amount of optical code overlap is different from the second minimum amount of optical code overlap.

13. The method of claim 1 wherein the step of determining an extent to which the optical code overlaps with the exclusion zone comprises comparing a position within the scan volume of the optical code to a position within the scan volume of the configurable exclusion zone.

14. The method of claim 1 wherein the scan data located within the configurable exclusion zone is not processed for decodable data corresponding to the optical code.

15. The method of claim 1 wherein the data reader comprises an imaging based scanning system including an image sensor configured to capture an image of the scan volume and a position within the scan volume of the configurable exclusion zone is defined with respect to a location within the image.

16. The method of claim 1 wherein the data reader comprises an imaging based scanning system including an image sensor configured to capture an image of the scan volume and a position within the scan volume of the configurable exclusion zone is defined with respect to a location within the image and a position within a depth of field of the data reader.

17. The method of claim 1 wherein the data reader comprises a laser based scanning system configured to generate a scan pattern along a scan arc, project the scan pattern into the scan volume, and detect light reflected by the optical code for decoding the optical code, and a position within the scan volume of the configurable exclusion zone is defined with respect to one or more portions of the scan pattern generated by the laser based scanner.

18. The method of claim 1 wherein

the data reader comprises an imaging based scanning system including an image sensor configured to capture an image of scan volume,

the step of acquiring the scan data comprises acquiring, via the image sensor, an image of the optical code, and

the step of processing the scan data comprises:

extracting pixel data from the image of the optical code corresponding to a plurality of sub-regions, the plurality of sub-regions oriented with respect to one another in a pattern,

detecting a set of edge transition locations in the pixel data and decoding the pixel data based on the set of edge transition locations, and

storing a position within the image of the optical code.

19. The method of claim 1 wherein

the data reader comprises an imaging based scanning system including an image sensor configured to capture an image of scan volume,

the step of acquiring the scan data comprises acquiring, via the image sensor, an image of the optical code, and

the step of processing the scan data comprises using a two-dimensional decoding algorithm to determine whether the scan data contains decodable data corresponding to the optical code, and if the scan data contains decodable data, storing a position within the image of the decodable data corresponding to the optical code.

20. The method of claim 1 wherein

the data reader comprises a laser based scanning system configured to generate a scan pattern along a scan arc, project the scan pattern into the scan volume, and detect light reflected by the optical code for decoding the optical code,

the step of acquiring the scan data comprises scanning, via the laser based scanning system, the optical code, and recording a position within the scan pattern of the scanning beam during the scan, and

the step of processing the scan data comprises detecting a set of edge transition locations in each scan line of the scan pattern and decoding the scan data based on the set of edge transition locations, and storing a position within the scan pattern of the optical code.

21. The method of claim 1, further comprising:

configuring the configurable exclusion zone by reading one or more configuration commands defining a position within the scan volume of the configurable exclusion zone and the first exclusion parameter.

22. The method of claim 1, further comprising:

configuring the configurable exclusion zone by interactively training the data reader.

23. The method of claim 22 wherein

the data reader comprises an imaging based scanning system including an image sensor configured to capture an image of the scan volume, and

the step of configuring the configurable exclusion zone by interactively training the data reader comprises acquiring, via the image sensor, an image of the scan volume, displaying on a display the image, and receiving from a user an indication of a location on the displayed image of the configurable exclusion zone.

24. A method of processing an optical code disposed within a scan volume of a data reader, comprising the steps of:

acquiring, via the data reader, scan data including an image or scan of an optical code located within the scan volume of the data reader, the scan volume having associated therewith a configurable exclusion zone;

processing the scan data for decodable data corresponding to the optical code;

determining whether to reject the optical code based on a position within the scan volume of the optical code relative to the configurable exclusion zone; and

if a determination is made to not reject the optical code, decoding the optical code and transmitting decoded data from the optical code to a host along with an indication that the optical code has been read.

25. The method of claim 24 wherein a configuration of the configurable exclusion zone is selected from the group consisting of a type 1 configuration in which an optical code is rejected if the entire optical code is within the exclusion zone, a type 2 configuration in which an optical code is rejected if a centroid of an optical code is within the exclusion zone, and a type 3 configuration in which an optical code is rejected if any portion of an optical code is within the exclusion zone.

26. The method of claim 24 wherein the optical code is rejected if at least a portion of the optical code is within the configurable exclusion zone and comprises a predefined optical code symbology type.

27. The method of claim 24 wherein the optical code is rejected if at least a portion of the optical code is within the configurable exclusion zone and has embedded therein a predefined type of data.

28. The method of claim 24 wherein the optical code is rejected if at least a portion of the optical code is within the configurable exclusion zone and has embedded therein predefined data values.

29. The method of claim 24 wherein at least a portion of the scan data is not processed based on a proximity of the scan data to the configurable exclusion zone.

30. The method of claim 24, wherein the step of determining whether to reject the optical code is performed without projecting an aiming pattern into the scan volume and without regard to whether the aiming pattern intersects the optical code.

31. A method of configuring a data reader to selectively reject optical codes from a scan volume of the data reader, the method comprising the steps of:

defining a set of exclusion zones located within the scan volume of the data reader; and

for each exclusion zone, defining an amount of optical code overlap with the exclusion zone required to reject an optical code that is located within the scan volume.

32. The method of claim 31, further comprising:

for each exclusion zone, defining a set of optical code symbology types to reject if an overlap with the exclusion zone is rejectable.

33. The method of claim 31, further comprising:

for each exclusion zone, defining a set of optical code data types to reject if an overlap with the exclusion zone is rejectable.

34. A method of configuring a data reader to selectively read and accept predetermined optical codes from a scan volume of the data reader, the method comprising the steps of:

defining a set of exclusion zones within the scan volume of the data reader; and

for each exclusion zone, defining an amount of optical code overlap with the exclusion zone required to reject the optical code, wherein the step of defining the set of exclusion zones comprises decoding a plurality of optical codes within the scan volume of the data reader, storing a position within the scan volume of each optical code, and creating an exclusion zone corresponding to the position within the scan volume of each optical code.

35. A system for processing optical codes within a scan volume of a data reader, comprising:

a data reader configured to acquire scan data from the scan volume of the data reader, the scan volume having associated therewith a configurable exclusion zone;

a memory for storing a position within the scan volume of the configurable exclusion zone and a first exclusion parameter defining a minimum amount of optical code overlap with the exclusion zone required to reject an optical code; and

a processor in communication with the data reader and the memory, the processor configured to;

cause the data reader to acquire scan data representing an optical code located within the scan volume of the data reader;

process the scan data for decodable data corresponding to the optical code;

determine an extent to which the optical code overlaps with the exclusion zone;

determine whether the extent to which the optical code overlaps with the exclusion zone meets or exceeds the minimum amount of optical code overlap defined by the first exclusion parameter; and

if the extent to which the optical code overlaps with the exclusion zone does not meet or exceed the minimum amount of optical code overlap defined by the first exclusion parameter, report the acceptance of the optical code.

36. The system of claim 35 wherein

the memory has stored therein a second exclusion parameter defining one or more optical code symbology types to reject and a third exclusion parameter defining one or more optical codes to reject based on a data content of the optical code, and

the processor is further configured to report the acceptance of the optical code provided that a symbology type of the optical code does not correspond to one of the optical code symbology types defined by the second exclusion parameter and the optical code does not have embedded therein data correspond to the data content of one or more of the optical codes defined by the third exclusion parameter.