Methods and apparatus for improving direct part mark scanner performance

• US 20060138234A1
• Filed: 12/29/2004
• Published: 06/29/2006
• Est. Priority Date: 12/29/2004
• Status: Abandoned Application

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Carlson, Bradley, He, Duanfeng, Joseph, Eugene
• Application Number:
  US11/025,884
• Publication Number:
  US 20060138234A1
• Time in Patent Office: Days
• US Class Current: 235/454
• CPC Class Codes: G06K 7/10732 Light sources
• CPC Class Codes: G06K 7/10752 Exposure time control
• CPC Class Codes: G06K 7/12 using a selected wavelength, e.g. to sense red marks and ignore blue marks
• CPC Class Codes: G06K 7/14 using light without selection of wavelength, e.g. sensing reflected white light G06K7/10831 - G06K7/1097 take precedence

Abstract

Methods and apparatus for improving direct part mark dataform decoding using a scanner comprising a processing unit, an optical module and an imaging sensor with an extended dynamic range. The scanner captures data to obtain an extended dynamic range image for analysis. In one embodiment, the sensor is sensitive to more than eight bits per pixel and in other embodiments multiple exposures are taken. Further in alternate embodiments, the scanner comprises a pass-band filter that passes the light emitted by an illumination module.

Claims

1. A method of scanning comprising:

illuminating an object using an illumination medium coupled to a scanner;

capturing multiple exposures of said object, wherein each exposure comprises a different dynamic range;

combining at least two of said captured exposures to obtain an image with an extended dynamic range; and

analyzing said combined image.

2. The method of claim 1, wherein said object comprises a dataform that is a dataform.

3. The method of claim 1, wherein said scanner further comprises:

a processing unit;

an optical module; and

an imaging sensor.

4. The method of claim 3, wherein said scanner further comprises:

an illumination medium; and

a band-pass filter having a pass-band that significantly overlaps the wavelength of the illumination medium.

5. The method of claim 4, wherein said band-pass filter is positioned in front of said optical module.

6. The method of claim 4, wherein said band-pass filter is positioned behind said optical module.

7. The method of claim 4, wherein said illumination medium emits a near infrared illumination, and said band-pass filter passes said near infrared illumination.

8. The method of claim 7, wherein said band-pass filter is slightly broadened to transmit wavelengths beyond said near infrared illumination.

9. A direct part mark scanner comprising:

a processing unit;

an optical module; and

an imaging sensor with an extended dynamic range, wherein said direct part mark scanner captures at least one image to obtain an extended dynamic range image.

10. The direct part mark scanner of claim 9, wherein said imaging sensor comprises a data capture level greater than eight bits per pixel.

11. The direct part mark scanner of claim 9, wherein said imaging sensor uses multiple exposures to obtain an image with an extended dynamic range.

12. The direct part mark scanner of claim 9, further comprising:

an illumination medium; and

a band-pass filter having a pass-band that significantly overlaps the wavelength of the illumination medium.

13. The direct part mark scanner of claim 12, wherein said band-pass filter is positioned in front of said optical module.

14. The direct part mark scanner of claim 12, wherein said band-pass filter is positioned behind said optical module.

15. The direct part mark scanner of claim 12, wherein said illumination medium emits a near infrared illumination, and said band-pass filter passes said near infrared illumination.

16. The direct part mark scanner of claim 15, wherein said band-pass filter is slightly broadened to transmit wavelengths beyond said near infrared illumination.

17. A direct part mark scanner comprising:

a processing unit;

an optical module;

an imaging sensor;

an illumination medium, wherein said illumination medium emits near infrared illumination; and

a band-pass filter wherein said band-pass filter passes said near infrared illumination.

18. The direct part mark scanner of claim 17, wherein said imaging sensor is an extended dynamic range sensor comprising a data capture level greater than eight bits per pixel, and wherein said direct part mark scanner captures at least one image to obtain an extended dynamic range image.

19. The direct part mark scanner of claim 17, wherein said band-pass filter is slightly broadened to transmit wavelengths beyond said near infrared illumination.

20. The direct part mark scanner of claim 17, wherein said band-pass filter is positioned in front of said optical module.

21. The direct part mark scanner of claim 17, wherein said band-pass filter is positioned behind said optical module.