Adaptive optical image reader

• US 7,331,523 B2
• Filed: 02/10/2004
• Issued: 02/19/2008
• Est. Priority Date: 07/13/2001
• Status: Expired due to Term

• Current Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Original Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Inventors: Longacre, Andrew Jr., Pettinelli, John, Hussey, Robert M., Hawley, Thomas, Meier, Timothy
• Primary Examiner(s): Kim; Ahshik
• Application Number:
  US10/775,983
• Publication Number:
  US 20050056699A1
• Time in Patent Office: 1,470 Days
• Field of Search: 235/462.25, 235/462.26, 235/462.24
• US Class Current: 235/462.25
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning
• CPC Class Codes: G06K 7/10752 Exposure time control
• CPC Class Codes: G06K 7/10851 Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device basic electronic circuitry H03

Abstract

There is described in one embodiment a method for use by an apparatus that can acquire an image. According to a described method, parameters for utilization by the apparatus are provided. According to a described method, a method can include acquiring an image and can further include evaluating an image. In another embodiment, there is described an apparatus comprising a plurality of digitizers. In one example of an embodiment of an apparatus including a plurality of digitizers, the digitizers can be configured to run in parallel. In another example of an embodiment of an apparatus including a plurality of digitizers, the digitizers can be configured to run in series.

Claims

1. An algorithm for use by a digital image reader/decoder, comprising the steps:

(i) acquire an image at an initial frame rate parameter, gain parameter, and exposure time parameter,

(ii) evaluate the image,

(iii) determine whether the system is operating at a fastest frame rate, and, if not,

(iv) calculate a new exposure time parameter to provide a desired image illumination,

(v) calculate a maximum frame rate parameter that will support the new exposure time,

(vi) calculate a new exposure setting parameter that will support the new exposure time at the maximum frame rate,

(vii) determined whether the image is acceptable and, if yes,

(viii) output and decode the image, and provide the parameters in (iv-vi) to the imager as new initial parameters, and

(ix) return to (i).

2. An algorithm for use by a digital image reader/decoder, comprising the steps:

(i) acquire the image,

(ii) evaluate the image,

(iii) determine whether the system is operating at a fastest frame rate, and, if not,

(iv) calculate a new exposure time parameter to provide a desired image illumination,

(v) calculate a maximum frame rate parameter that will support the new exposure time,

(vi) calculate a new exposure setting parameter that will support the new exposure time at the maximum frame rate,

(vii) determine whether the image is acceptable and, if not,

(viii) provide the parameters in (iv-vi) to the imager as new initial parameters, and

(ix) return to (i).

3. An alogorithm for use by a digital image reader/decoder, comprising the steps:

(i) acquire the image,

(ii) evaluate the image,

(iii) determine whether the system is operating at a fastened frame rate, and, if yes

(iv) determine an illumination level of the image and whether the image was acquired at a maximum exposure setting and a maximum gain setting and, if no,

(v) calculate a new exposure parameter and a new gain parameter that are, at most, maximum respective values for the initial frame rate, which produce a desired image illumination,

(vi) determine whether the image is acceptable and, it not,

(vii) provide the parameters in [(iv-vi)] to the imager as new initial parameters, and

(viii) return to (i).

4. An alogrithm for use by a digital image reader/decoder, comprising the steps:

(i) acquire the image,

(ii) evaluate the image,

(iii) determine whether the system is operation at a fastest rate, and, if yes,

(iv) determine an illumination level of the image and whether the image was acquired at a maximum exposure setting and a maximum gain setting and, if no,

(v) calculate a new expsoure parameter and a new gain parameter that are, at most, maximum respective values for the initial frame rate, which produce a desired image illumination,

(vi) determine whether the image is acceptable and, if yes,

(vii) output and decode the image, and provide the parameters in (iv-vi) to the imager as new initial parameters, and

(viii) return to (i).

5. An algorithm for use by a digital image reader/decoder, comprising the steps:

(i) acquire the image,

(i) evaluate the image,

(iii) determine whether the system is operating at a fastest frame rate, and, if yes,

(iv) determine an illumination level of the image and whether the image was acquired at a maximum exposure setting and a maximum gain setting and, if yes,

(v) calculate a new exposure time parameter that will provide a desired image illumination,

(vi) calculate a maximum frame rate parameter that will support the new exposure time parameter,

(vii) calculate a new exposure setting parameter that will support the new exposure time at the maximum frame rate,

(viii) determine whether the image is acceptable and, if yes,

(ix) output and decode the image, and provide the parameters in (v-vii) to the imager as new initial parameters, and

(x) return to (i).

6. An algorithm for use by a digital image reader/decoder, comprising the steps:

(i) acquire the image,

(ii) evaluate the image,

(iii) determine whether the system is operating at a fastest frame rate, and, if yes,

(iv) determine an illumination level of the image and whether the image was acquired at a maximum exposure setting and a maximum gain setting and, if yes,

(v) calculate a new exposure time parameter that will provide a desired image illumination,

(vi) calculate a maximum frame rate parameter that will support the new exposure time parameter,

(vii) calculate a new exposure setting parameter that will support the new exposure time at the maximum frame rate,

(viii) determine whether the image is acceptable and, if yes,

(ix) output and decode the image, and provide the parameters in (v-vii) to the imager as new initial parameters, and

(x) return to (i).

7. A digital image reading system, comprising:

a) an image sensing component adapted to acquire an image at an initial frame rate parameter, gain parameter, and exposure time parameter; and

b) a computer coupled to the image sensing component, wherein the computer is programmed to adjust the frame rate such that the image sensing component can operate at a maximum frame rate to capture an acceptable image, wherein the computer is programmed to;

(i) acquire the image,

(ii) evaluate the image

(iii) determine whether the system is operating at a fastest frame rate, and, if not,

(iv) calculate a new exposure time parameter to provide a desired image illimination,

(v) calculate a maximum frame rate parameter that will support the new exposure time,

(vi) calculate a new exposure setting parameter that will support the new exposure time at the maximum frame rate,

(vii) determine whether the image is acceptable and, if yes,

(viii) output and decode the image, and provide the parameters in (iv-vi) to the imager as new initial parameters, and

(ix) return to (i).

8. A digital image reading system, comprising:

(a) an image sensing component adapted to acquire an image at an initial frame rate parameter, gain parameter, and exposure time parameter; and

(b) a computer coupled to the image sensing component, wherein the computer is programmed to adjust the frame rate such that the image sensing component can operate at a maximum frame rate to capture an acceptable image, wherein the computer is programmed to;

(i) acquire the image,

(ii) evaluate the image

(iii) determine whether the system is operating at a fastest frame rate, and if not,

(iv) calculate a new exposure time parameter to provide a desired image illumination,

(v) calculate a maximum frame rate parameter that will support the new exposure time,

(vi) calculate a new exposure setting parameter that will support the new exposure time at the maximum frame rate,

(vii) determine whether the image is acceptable, and if not,

(viii) provide the parameters in (iv-vi) to the imager initial parameters, and

(ix) return to (i).

9. A digital image reading system, comprising:

a) an image sensing component adapted to acquire an image at an initial frame rate parameter, gain parameter, and exposure time parameter; and

b) a computer coupled to the image sensing component, wherein the computer is programmed to adjust the frame rate such that the image sensing component can operate at a maximum frame rate to capture an acceptable image, wherein the computer is programmed to;

(i) acquire the image,

(ii) evaluate the image

(iii) determine whether the system is operating at a fastest frame rate, and if yes,

(iv) determine an illumination level of the image and whether the image was acquired at a maximum exposure setting and a maximum gain setting, and, if no,

(v) calculate a new exposure parameter and new gain parameter that are, at most, maximum respective values for the initial frame rate, which produce a desired image illumination,

(vi) determine whether the image is acceptable and, if not,

(vii) provide the parameters in (iv-vi) to the imager as new initial parameters, and

(viii) return to (i).

10. A digital image reading system, comprising:

a) an image sensing component adapted to acquire an image at an initial frame rate parameter, gain parameter, and exposure time parameter; and

b) a computer couopled to the image sensing component, wherein the computer is programmed to adjust the frame rate such that the image sensing component can operate at a maximum frame rate to capture an acceptable image, wherein the computer is programmed to;

(i) acquire the image,

(ii) evaluate the image,

(iii) determine whether the system is operating at a fastest frame rate, and, if yes,

(iv) determine an illumination level of the image and whether the image was acquired at a maximum exosure setting and a maximum gain setting, and, if no,

(v) calculate a new exposure parameter and a new gain parameter that are, at most, maximum rsepective values for the initial frmae rate, which produce a desired image illumination,

(vi) determine whether the image is acceptable and, if yes,

(vii) output and decode the image, and provide the parameters in (iv-vi) to the imager as new initial parameters, and <

(viii) return to (i).

11. A digital image reading system, comprising:

a) an image sensing componenet adapted to acquire an image at an initial frame rate parameter, gain parameter, and exposure time parameter; and

b) a computer coupled to the image sensing component, wherein the computer is programmed to adjust the frame rate such that the image sensing component can operate at a maximum frame rate to capture an acceptable image, wherein the computer is programmed to;

(i) acquire the image,

(ii) evaluate the image,

(iii) determine whether the system is operating at a fastest frame rate, and, if yes,

(iv) determine an illumination level of the image and whether the image was acquired at a maximum exposure setting and a maximum gain setting, and, if yes,

(v) calculate a new exposure time parameter that will provide a desired image illumination,

(vi) calculate a maximum frame rate parameter the will support the new exposure time parameter,

(vii) calculate a new exposure setting parameter that will support the new exposure time at the maximum frame rate,

(viii) determine whether the image is acceptable and, if yes,

(ix) output and decode the image, and provide the parameters in (v-vii) to the imager as new initial parameters, and

(x) return to (i).

12. A digital image reading system, comprising:

a) an image sensing component adapted to acquire an image at an initial frame rate parameter, gain parameter, and exposure time parameter; and

b) a computer coupled to the image sensing component, wherein the computer is programmed to adjust the frame rate such that the image sensing component can operate at a maximum frame rate to capture an acceptable image, wherein the computer is programmed to;

(i) acquire the image,

(ii) evaluate the image,

(iii) determine whether the system is operating at a fastest frame rate, and, if yes,

(iv) determine an illumination level of the image and whether the image was acquired at a maximum exposure setting and a maximum gain setting, and, if yes,

(v) calculate a new exposure time parameter that will provide a desired image illumination,

(vi) calculate a maximum frame rate parameter that will support the new exposure time parameter,

(vii) calculate a new exposure setting parameter that will support the new exposure time at the maximum frame rate,

(viii) determine whether the image is acceptable and, if yes,

(ix) output and decode the image, and provide the parameters in (v-vii) to imager as new initial parameters, and

(x) return to (i).

13. A digital image reading system, comprising:

a) an image reading component including a digitizer; and

b) an image decoding component,

wherein the image reading component includes a plurality of digitizers, and wherein each of the plurality of digitizers is configured to operate over a respective parameter range of a given parameter associated with the plurality of digitizers, and further wherein each parameter range is different from any other parameter range.

14. The digital image reading system of claim 13, wherein the given parameter is a reading distance.

15. The digital image reading system of claim 13, wherein the given parameter is a symbology black/white contrast.

16. The digital image reading system of claim 13, wherein the given parameter is a symbology color contrast.

17. The digital image reading system of claim 13, wherein the given parameter is a motion blur.

18. The digital image reading system of claim 13, wherein the given parameter is a bar growth.

19. The digital image reading system of claim 13, comprising three digitizers configured to operate over a close reading range, a medium reading range, and far reading range.

20. The digital image reading system of claim 19, wherein at least two of the parameter ranges overlap.

21. A process for obtaining an acceptable image, comprising:

providing a digital image reader having a plurality of digitizers;

making an image acquistion attempt utilizing one of the plurality of digitizers; and

making a subsequent image acquistion attempt utlilizing a different one of the plurality of digitizers, wherein the plurality of digitizers are configured for operation over a respective parameters range of a given parameter associated with the plurality of digitizers, further wherein each parameter range is different from any other parameter range.

22. A bar code reading device comprising:

an image sensor including a plurality of photosensitive elements;

a lens assembly focusing an image onto said image sensor;

a trigger;

a housing encapsulating said image sensor;

a control circuit in communication with said image sensor wherein said device is configured so that said device captures image data in response to actuation of said trigger; and

a plurality of digitizers, wherein each of the plurality of digitizers is configured to operate over a respective parameter range of a given parameter associated with the plurality of digitizers, and further wherein each parameter range is different from any other parameter range.

23. The bar code reading device of claim 22, wherein the given parameter is a reading distance.

24. The bar code reading device of claim 22, wherein the given parameter is a symbology black/white contrast.

25. The bar code reading device of claim 22, wherein the given parameter is a symbology color contrast.

26. The bar code reading device of claim 22, wherein the given parameter is a motion blur.

27. The bar code reading device of claim 22, wherein the given parameter is a bar growth.

28. The bar code reading device of claim 22, comprising three digitizers configured to operate over a close reading range, a medium reading range, and a far reading range.

29. The bar code reading device of claim 22 wherein at least two of the parameter ranges overlap.

30. The bar code reading device of claim 22, wherein each of said plurality of digitizers is a software module executable by said control circuit.

31. The bar code reading device of claim 22, wherein said plurality of digitizers are configured to run in parallel.

32. The bar code reading device of claim 22, wherein said plurality of digitizers are configured to run in series.

33. The bar code reading device of claim 22, wherein said image sensor is a two dimensional image sensor comprising a plurality of pixels formed in a plurality of rows and columns of pixels.

34. The bar code reading device of claim 33, wherein the given parameter is a reading distance.

35. The bar code reading device of claim 33, wherein the given parameter is a symbology black/white contrast.

36. The bar code reading device of claim 33, wherein the given parameter is a symbology color contrast.

37. The bar code reading device of claim 33, wherein the given parameter is a motion blur.

38. The bar code reading device of claim 33, wherein the given parameter is a bar growth.

39. The bar code reading device of claim 33, comprising three digitizers configured to operate over a close reading range, a medium reading range, and a far reading range.

40. The bar code reading device of claim 39, wherein at least two of the parameter ranges overlap.

41. The bar code reading device of claim 33, wherein each of said plurality of digitizers is a software module executable by said control circuit.

42. The bar code reading device of claim 33, wherein said plurality of digitizers are configured to run in parallel.

43. The bar code reading device of claim 33, wherein said plurality of digitizers are configured to run in series.