Portable data file readers

• US 5,591,955 A
• Filed: 11/16/1994
• Issued: 01/07/1997
• Est. Priority Date: 05/11/1993
• Status: Expired due to Fees

• Current Assignee: Vadim Laser
• Original Assignee: Vadim Laser
• Inventors: Laser, Vadim
• Primary Examiner(s): SHEPPERD, JOHN W
• Application Number:
  US08/340,285
• Time in Patent Office: 783 Days
• Field of Search: 348/218, 235/462-472
• US Class Current: 235/462.06
• CPC Class Codes: G06K 17/0022 arrangements or provisions for transferring data to distant stations, e.g. from a sensing device "transfer between computer elements G06F13/00 "; data-transmission H04L
• CPC Class Codes: G06K 2007/10524 Hand-held scanners
• CPC Class Codes: G06K 2207/1011 Aiming
• CPC Class Codes: G06K 2207/1013 Multi-focal
• CPC Class Codes: G06K 7/10574 Multiple sources
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning
• CPC Class Codes: G06K 7/10752 Exposure time control
• CPC Class Codes: G06K 7/10811 Focalisation
• CPC Class Codes: G06K 7/1092 sensing by means of TV-scanning
• CPC Class Codes: G06K 7/1417 2D bar codes

Abstract

The present invention utilizes photosensitive arrays for decoding optically readable portable data files. The invention accomplishes focusing, controlling image exposure, capturing data files, and processing information contained within optically readable portable data files.

Claims

1. A process for receiving an image of an object, comprising:

(a) aiming one or more beams of photons at the object;

(b) capturing an image of the object for preprocessing;

(c) determining whether the object is within focal range;

(d) focusing the image upon two or more photosensitive arrays, wherein the step of focusing involves adjusting two or more lenses such that a partial image of the object is focused on each array, wherein the partial images overlap each other;

(e) indicating whether the object is within focal range;

(f) controlling the exposure of the object;

(g) triggering the capture of the image;

(h) capturing a partial image by each of the arrays;

(i) digitizing said captured partial images; and

(j) processing said captured partial images.

2. The process according to claim 1, wherein the method for aiming one or more beams of photons includes utilizing one or more light emitting diodes such that said beams produce corresponding images on the plane of partial images.

3. The process according to claim 1, wherein the method for determining whether the object is within focal range includes obtaining the images produced by said aiming beams and detecting convergence of said aiming beams such that the object is within focal range upon convergence of said aiming beams.

4. The process according to claim 1, wherein the method for determining whether the object is within focal range includes obtaining the images produced by said aiming beams and analyzing the shape of the fiducial marks produced by said aiming beams whereby the overlap of the image produced by said aiming beams correlates to the displacement of the object from focal range.

5. The process according to claim 1, wherein the method for determining whether the object is within focal range includes obtaining the images produced by said aiming beams and detecting the distance of separation of the images produced by said aiming beams such that the distance of separation of the images produced by said aiming beams correlates to the displacement of tile object from focal range.

6. The process according to claim 1, wherein the method for determining whether the object is within focal range includes obtaining the images produced by said aiming beams and varying the power of one or more of said aiming beams for determining which image is produced by which said beams for further determining the direction of the displacement of the object from focal range.

7. The process according to claim 1, wherein the method for determining whether the object is within focal range includes obtaining the image produced by said beams and turning off one or more of said beams for determining which image is produced by which of said beams for further determining the direction of the displacement of the object from focal range.

8. The process according to claim 1, wherein the method of adjusting two or more lenses involves moving the lenses so that the distance between the lenses decreases as the lenses move away from the arrays.

9. The process according to claim 1, wherein the partial image overlap remains a substantially constant percentage of the total image.

10. The process according to claim 1, wherein the method for controlling the exposure of the object including preprocessing comprises:

(a) obtaining an image at a first exposure for preprocessing;

(b) processing said image by analyzing the illumination from the abient light conditions;

(c) determining whether auxiliary illumination of the object is required whereby an image of the object may be obtained at a second exposure;

(d) obtaining a subsequent image at a third exposure for further preprocessing; and

(e) determining whether said exposure is sufficient or whether obtaining an image at subsequent exposures is necessary until sufficient exposure is obtained.

11. The process according to claim 1, wherein the triggering of the capture of the object occurs upon a determination by preprocessing that the object is within focal range.

12. The process according to claim 1, wherein the triggering of the capture of the object occurs upon convergence of said aiming beams.

13. The process according to claim 1, wherein the triggering of the capture of the image occurs upon overlap of the images produced by said aiming beams whereby said overlap correlates to a displacement of the object within focal range.

14. The process according to claim 1, wherein the capturing of a partial image includes focusing the partial image on a photosensitive array such that photons incident upon the array are converted to electrical charges whereby such electrical charges produce analog voltage signals corresponding to the partial image.

15. The process according to claim 1, wherein the capturing of a partial image includes utilizing the storage capability of a photosensitive array so that said photosensitive array implements an analog memory storage device.

16. The process according to claim 1, wherein the digitizing of said captured partial images includes converting said captured partial images to a discrete-time digital signal using an analog-to-digital converter.

17. The process according to claim 1, wherein the processing of said captured partial images includes processing said partial images using a digital signal processor.

18. A portable reader of images from objects, comprising:

(a) a frame having a window;

(b) at least two photosensitive arrays mounted within said frame and behind said window, said array for converting images into corresponding electrical signals;

(c) at least a adjustable two optical strings between said frame window and said arrays for focusing a partial image of an object onto each array;

wherein the partial images overlap each other;

(d) at least two electromagnetic beam generators mounted on said frame such that the beams of said generators cross near the point of best focus of said optical strings; and

(e) computer means for processing said electrical signals from said arrays.

19. The reader of claim 18 further comprising aiming means for determining the position of an object relative to the focal range.

20. The reader of claim 18 further comprising capturing means for obtaining an image of an object for preprocessing whereby focusing and exposure control may be achieved.

21. The reader of claim 18 further comprising means for determining whether an object is within focal range.

22. The reader of claim 18 further comprising focusing means for capturing a focused image of an object.

23. The reader of claim 18 further comprising exposure control means for adjusting the sensitivity of the arrays to varying ambient light conditions.

24. The reader of claim 18 further comprising triggering means for initiating the capture of an image of an object.

25. The reader of claim 18 further comprising image capturing means for obtaining an electrical representation of an image of an object.

26. The reader of claim 18 further comprising analog to digital signal conversion means for obtaining a digital discrete-time representation of an image of an object.

27. The reader of claim 18 further comprising signal control means for electronic processing and manipulation of an image of an object.

28. The reader of claim 18 further comprising electronic memory means for temporary storage of an image of an object.

29. A portable reader of images from objects, comprising:

(a) a first two-dimensional sensor array and a second two-dimensional sensor array;

(b) a first optical lens and a second optical lens, said first optical lens moveable relative to the optical axis of said first sensor array, and said second optical lens moveable relative to the optical axis of said second sensor array;

(c) means for reciprocating said first and second optical lenses relative to their respective sensor arrays such that a partial image of an object can be focused on each array wherein the partial images overlap each other; and

(d) means for accurately positioning the portable image reader relative to an object to be read.

30. The reader of claim 29 further comprising aiming means for determining the position of an object relative to the focal range.

31. The reader of claim 29 further comprising capturing means for obtaining an image of an object for preprocessing whereby focusing and exposure control may be achieved.

32. The reader of claims 29 further comprising means for determining whether an object is within focal range.

33. The reader of claim 29 further comprising focusing means for capturing a focused image of an object.

34. The reader of claim 29 further comprising focusing indicating means for signaling that the object is within focal range.

35. The reader of claim 29 further comprising exposure control means for adjusting the sensitivity of the arrays to varying abient light conditions.

36. The reader of claim 29 further comprising triggering means for initiating the capture of an image of an object.

37. The reader of claim 29 further comprising image capturing means for obtaining an electrical representation of an image of an object.

38. The reader of claim 29 further comprising analog to digital signal conversion means for obtaining a digital discrete-time representation of an image of an object.

39. The reader of claim 29 further comprising signal control means for electronic processing and manipulation of and image of an object.

40. The reader of claim 29 further comprising electronic memory means for temporary storage of an image of an object.

41. A process for receiving an image of an object, comprising:

(a) aiming one or more beams of photons at the object;

(b) capturing an image of the object for preprocessing;

(c) determining whether the object is within focal range;

(d) focusing overlapping partial images of the object upon two or more photosensitive arrays each of said arrays having an optical axis of sight, wherein the step of focusing involves shifting the optical axes of sight depending upon the distance of the object from the arrays such that the overlap of the partial images remains a substantially constant percentage of the total image;

(e) indicating whether the object is within focal range;

(f) controlling the exposure of the object;

(g) triggering the capture of the image;

(h) capturing a partial image by each of the arrays;

(i) digitizing said captured partial images; and

(j) processing said captured partial images.