Method and apparatus for control of a detector array based imaging

• US 5,880,459 A
• Filed: 06/05/1995
• Issued: 03/09/1999
• Est. Priority Date: 04/30/1979
• Status: Expired due to Term

• Current Assignee: LMI Technologies Inc.
• Original Assignee: Sensor Adaptive Machines, Inc.
• Inventors: Hageniers, Omer L., Pastorius, W. J., Pryor, Timothy R., Hockley, Bernard, Liptay-Wagner, Nick
• Primary Examiner(s): Westin, Edward P.
• Assistant Examiner(s): Lee, John R.
• Application Number:
  US08/463,096
• Time in Patent Office: 1,373 Days
• Field of Search: 250/559.29, 250/559.3, 250/559.31, 250/559.33, 250/559.35, 250/559.37, 250/559.4, 250/559.08, 250/559.07, 250/208.1, 356/3.01, 356/3.02, 356/3.03, 356/3.06, 356/3.07, 356/3.1, 356/3.12, 356/4.01, 901/9, 901/46, 901/47, 348/294, 348/297, 348/298, 348/302
• US Class Current: 250/208.1
• CPC Class Codes: G01B 11/002 for measuring two or more coordinates
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures
• CPC Class Codes: G01B 11/2416 of gears optical projection profile comparators G01B9/08
• CPC Class Codes: G01B 11/245 using a plurality of fixed, simultaneously operating transducers G01B11/2408 - G01B11/2425, G01B11/255 take precedence
• CPC Class Codes: G01S 17/46 Indirect determination of position data
• CPC Class Codes: G01S 17/48 Active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/87 Combinations of systems using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/88 Lidar systems specially adapted for specific applications
• CPC Class Codes: G01S 17/89 for mapping or imaging
• CPC Class Codes: G01S 7/481 Constructional features, e.g. arrangements of optical elements
• CPC Class Codes: G01S 7/4811 common to transmitter and receiver
• CPC Class Codes: G01S 7/4813 Housing arrangements
• CPC Class Codes: G01S 7/491 Details of non-pulse systems

Abstract

A method and apparatus for control of a detector array based imaging system which includes analyzing the output of a photodetector array and modifying or controlling a photodetector array light gathering related variable based on the analysis. In particular, one embodiment of the invention involves temporarily storing the image data from the photodetector array and modifying one of the scan clock rate or the scan clock rate within a scan of the photodetector array based on an analysis of the stored data to optimize the light gathering of the image system. A further embodiment of the invention involves controlling a light gathering related photodetector array variable and an illumination source variable based on an analysis of the output of the photodetector array.

Claims

1. Apparatus for controlling a detector array based imaging system, comprising:

means for imaging light reflected from said object onto a photodetector array,

storage means for storing data from said photodetector array,

microcomputer means for analyzing said stored data, and for controlling a light gathering related detector array variable comprising one of scan clock rate and scan clock rate within a scan based on said stored data to optimize the light gathering of said imaging system.

2. Apparatus according to claim 1, wherein said microcomputer means controls the light gathering related detector array variable comprising scan clock rate.

3. Apparatus according to claim 1, wherein said microcomputer means controls the light gathering related detector array variable comprising scan clock rate within a scan.

4. Apparatus according to claim 1, further comprising means for modifying a light control variable.

5. Apparatus according to claim 4, wherein said light control variable is the intensity of the light reflected from said object onto said photodetector array, said intensity being varied between a low level and a high level.

6. Apparatus according to claim 1, further comprising microcomputer means for controlling the integration time of said photodetector array.

7. Apparatus according to claim 1, further comprising means for comparing said stored data to a threshold.

8. Apparatus for controlling a detector array based imaging system, comprising:

illumination source for illuminating said object with light, said object reflecting light onto a photodetector array means

means for controlling the intensity of said light reflected onto said photodetector array means between a low level and a high level of intensity,

means for controlling a light gathering related photodetector array variable, and

computer means for analyzing the output of said photodetector array, and for controlling said means for controlling the intensity of said light reflected onto said photodetector array and said means for controlling a light gathering related detector array variable based on said output of said array.

9. Apparatus according to claim 8, wherein said means for controlling a light gathering related photodetector array variable controls the scan clock rate of said photodetector array.

10. Apparatus according to claim 8, wherein said means for controlling a light gathering related photodetector array variable controls the scan clock rate within a scan of said photodetector array.

11. Apparatus according to claim 8, wherein said illumination source comprises a laser.

12. Apparatus according to claim 11, wherein said means for controlling the intensity of said light reflected onto said photodetector array means controls the intensity of the output of said laser.

13. Apparatus according to claim 8, further comprising means for filtering the output of said photodetector array.

14. A method for control of detector array based imaging system, comprising the steps of:

scanning an optical image formed with a photodetector array to provide data concerning said image,

temporarily storing said image data,

analyzing said stored data,

determining from said analysis a desired value of at least one photodetector array light gathering related variable, comprising one of scan clock rate and scan clock rate within a scan, and

modifying said variable based on said analysis to optimize the light gathering of said imaging system.

15. A method according to claim 14 wherein more than one light gathering variable is modified.

16. A method according to claim 14 further comprising modifying a light control variable to optimize the light gathering of said imaging system.

17. A method according to claim 16 wherein said light control variable is light intensity, said light intensity being varied between a low level and a high level.

18. A method according to claim 16 wherein said light control variable is the time a light is on.

19. A method according to claim 14 wherein said photodetector array light gathering related variable is scan clock rate.

20. A method according to claim 14, further comprising varying the integration time of said photodetector array.

21. A method according to claim 14 wherein said photodetector array light gathering related variable is array scan clock rate within a given scan.

22. A method according to claim 14 wherein said modification is effective on the next scan of said array.

23. A method according to claim 14 wherein said array is a matrix array.

24. A method according to claim 14 wherein said storage is erased on the next scan.

25. A method according to claim 14 wherein said image is used for measuring the position attitude, or dimension of objects.

26. A method according to claim 14 comprising the added step of filtering the output of said array.

27. A method according to claim 14 wherein a Microcomputer is used for said determination or analysis.

28. A method according to claim 14 wherein said stored data is compared to a threshold.

29. A method for controlling the light gathered by a detector array based imaging system, comprising the steps of:

illuminating an object with light from an illumination source, wherein light reflected from said object is imaged onto a photodetector array,

providing means for controlling the intensity of said reflected light between a low level and a high level of intensity,

providing means for controlling a light gathering related photodetector array variable, and

analyzing the output of said photodetector array, and controlling a light gathering related photodetector array variable and an illumination source variable based on said output of said photodetector array.

30. A method according to claim 29 wherein said light gathering related detector array variable is selected from a group comprising integration time, scan rate, and scan clock rate.

31. A method according to claim 30, wherein said controlled detector array variable is scan clock rate.

32. A method according to claim 30, wherein said controlled detector array variable is scan clock rate within a scan.

33. A method according to claim 29 wherein said data rate obtained from said array is maximized.

34. A method according to claim 29 wherein said control is to maximize the array signal level for processing.

35. A method according to claim 29 further including the step of storing the output of said array prior to said analysis.

36. A method according to claim 29 comprising the added step of filtering the output of said array.

37. A method according to claim 29 wherein a microcomputer is used for said determination or analysis.

38. A method according to claim 29 wherein said stored data is compared to a threshold.

39. A method according to claim 29 wherein said modification is effective on the next scan of said array.

40. A method according to claim 29 wherein an array control variable and a light control variable are modified.

41. A method according to claim 29 wherein said array is a matrix array.

42. A method according to claim 29 wherein said storage is temporary.

43. A method according to claim 29 wherein said image is used for measuring the position, attitude, or dimension of objects.