Optical reader having partial frame operating mode

• US 6,637,658 B2
• Filed: 01/22/2001
• Issued: 10/28/2003
• Est. Priority Date: 01/22/2001
• Status: Expired due to Term

• Current Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Original Assignee: Welch Allyn Incorporated
• Inventors: Smith, George S. II, Pankow, Matthew, Gardiner, Robert, Barber, Charles P., Gerst, Carl W. III, Hussey, Robert M.
• Primary Examiner(s): Lee, Michael G.
• Assistant Examiner(s): PAIK, STEVEN SANGYUL
• Application Number:
  US09/766,806
• Publication Number:
  US 20030062418A1
• Time in Patent Office: 1,009 Days
• Field of Search: 235/462.45, 235/462.25, 235/462.1, 235/462.09, 235/462.11, 235/462.12
• US Class Current: 235/462.45
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning

Abstract

The invention is an optical reader having a 2D image sensor that is configured to operate in a partial frame capture mode. In a partial frame operating mode, the reader clocks out and captures at least one partial frame of image data having image data corresponding to less than all of the pixels of an image sensor pixel array. In one embodiment, the reader operating in a partial frame operating mode captures image data corresponding to a linear pattern of pixels of the image sensor, reads the image data, attempts to decode for a decodable 1D symbol which may be represented in the image data, and captures a full frame of image data if the image data reading reveals a 2D symbol is likely to be present in a full field of view of the 2D image sensor.

Claims

1. A method of operating an optical reader having a 2D image sensor array comprising pixels, said method comprising the steps of:

(a) generating a partial frame of image data, said partial frame of image data comprising a plurality of generated electrical signals accurately representing an intensity of light incident on a plurality of pixels representing less than all of the pixels of said array;

(b) capturing said partial frame of image data from said 2D image sensor array corresponding to said plurality of electrical signals generated in step (a); and

(c) processing said partial frame of image data to recover information.

2. The method of claim 1, wherein said capturing step includes the step of capturing image data corresponding to a linear pattern of pixels.

3. The method of claim 1, wherein said capturing step includes the step of capturing image data corresponding to a plurality of angularly offset linear patterns of pixels.

4. The method of claim 1, wherein said capturing step includes the step of capturing image data corresponding to a plurality of vertically spaced apart horizontally oriented linear patterns of pixels.

5. The method of claim 1, wherein said capturing step includes the step of capturing image data corresponding to a grouping of pixels about a center of said image sensor.

6. The method of claim 1, wherein said processing step includes the step of reading said image data out of a memory device.

7. The method the claim 1, wherein said processing step includes the steps of reading said image data out of a memory device and attempting to decode for a decodable symbol which may be represented in said image data.

8. The method of claim 1, wherein said method further includes the step of capturing a full frame of image data if said processing step reveals that a 2D symbol is likely partially represented in said partial frame of image data.

9. The method of claim 1, wherein said method further includes the step of capturing an adaptively positioned partial frame of image data if said processing step reveals that a 2D symbol is likely partially represented in said partial frame of image data.

10. The method of claim 1, wherein said processing step includes the step of attempting to decode for a decodable symbol represented in said image data, said method further including the step of capturing a full frame of image data if said processing step reveals that a 2D symbol is likely partially represented in said partial frame of image data.

11. The method of claim 1, wherein information comprises a selected one of information decoded from a decodable symbol and information recognized from an optically recognizable character.

12. A method of operating an optical reader having a 2D image sensor array comprising pixels, said method comprising the steps of:

in a partial frame operating mode;

(a) generating a partial frame of image data, said partial frame of image data comprising a plurality of generated electrical signals accurately representing an intensity of light incident on a plurality of pixels representing less than all of the pixels of said array;

(b) capturing said partial frame of image data from said 2D image sensor array corresponding to said plurality of electrical signals generated in step (a); and

(c) processing said partial frame of image data to recover information; and

if said reader fails to recover information, switching operation of said reader to a full frame capture mode.

13. The method of claim 12, wherein said capturing step includes the step of capturing image data corresponding to a linear pattern of pixels.

14. The method of claim 12, wherein said capturing step includes the step of capturing image data corresponding to a plurality of angularly offset linear patterns of pixels.

15. The method of claim 12, wherein said capturing step includes the step of capturing image data corresponding to a plurality of vertically spaced apart horizontally oriented linear patterns of pixels.

16. The method of claim 12, wherein said capturing step includes the step of capturing image data corresponding to a grouping of pixels about a center of said image sensor.

17. The method of claim 12, wherein information comprises a selected one of information decoded from a decodable symbol and information recognized from an optically recognizable character.