WO2004013654B1 - Vehicle mounted night vision imaging system and method - Google Patents

Vehicle mounted night vision imaging system and method

Info

Publication number
WO2004013654B1
WO2004013654B1 PCT/IL2003/000639 IL0300639W WO2004013654B1 WO 2004013654 B1 WO2004013654 B1 WO 2004013654B1 IL 0300639 W IL0300639 W IL 0300639W WO 2004013654 B1 WO2004013654 B1 WO 2004013654B1
Authority
WO
WIPO (PCT)
Prior art keywords
light
pulse
camera
gating
image
Prior art date
Application number
PCT/IL2003/000639
Other languages
French (fr)
Other versions
WO2004013654A1 (en
Inventor
Ofer David
Yehuda Borenstein
Original Assignee
Elbit Systems Ltd
Ofer David
Yehuda Borenstein
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elbit Systems Ltd, Ofer David, Yehuda Borenstein filed Critical Elbit Systems Ltd
Priority to DE60319238T priority Critical patent/DE60319238T2/en
Priority to US10/523,340 priority patent/US7733464B2/en
Priority to AU2003247148A priority patent/AU2003247148A1/en
Priority to EP03766603A priority patent/EP1540373B1/en
Priority to JP2004525727A priority patent/JP4498135B2/en
Publication of WO2004013654A1 publication Critical patent/WO2004013654A1/en
Publication of WO2004013654B1 publication Critical patent/WO2004013654B1/en
Priority to IL165859A priority patent/IL165859A/en

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06Systems determining position data of a target
    • G01S17/08Systems determining position data of a target for measuring distance only
    • G01S17/10Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
    • G01S17/18Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves wherein range gates are used
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88Lidar systems specially adapted for specific applications
    • G01S17/89Lidar systems specially adapted for specific applications for mapping or imaging
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483Details of pulse systems
    • G01S7/484Transmitters
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483Details of pulse systems
    • G01S7/486Receivers
    • G01S7/489Gain of receiver varied automatically during pulse-recurrence period
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/495Counter-measures or counter-counter-measures using electronic or electro-optical means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/51Display arrangements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/12Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/0118Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/0118Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
    • G02B2027/012Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility comprising devices for attenuating parasitic image effects
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/0127Head-up displays characterised by optical features comprising devices increasing the depth of field
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/0138Head-up displays characterised by optical features comprising image capture systems, e.g. camera
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/014Head-up displays characterised by optical features comprising information/image processing systems
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/30Polarising elements

Abstract

A vehicle mounted imaging system and method, enabling selective imaging of objects in a low-visibility environment. The system includes a light source (30) providing non-visible light pulses and a camera (40) having an image intensifier enabled to gate selected received images. The light source may be a laser generator, which may be enabled to generate a pulse width related to the depth of a field to be imaged. The gated image intensifier may determine gating time spans according to the depth of a field to be imaged.

Claims

[Received by the International Bureau on 03 February 2004 (03.02.04) new claims 2,3,4,27 and 28 added ; original claim 6 deleted; ]
1. A vehicle mounted imaging system, the system comprising: a light source, said light source providing a pulse like light energy; a camera to receive light energy reflected from objects, said camera enabled to gate detection of said pulse like light energy reflected from objects within a depth of a field to be imaged, said depth of field having a minimal range (Rmin), said camera starting to detect light after a delay timing substantially given by the time it takes said pulse like light to reach said minimal range (Rmjn) and complete reflecting back to said camera from said minimal range (Rmin).
2. The system of claim 1 , wherein said pulse like light energy defines a substantial pulse width (TLascr) commencing at a start time (To); said delay timing is substantially given by the time elapsing from said start time (To) until twice said minimal range (Rmin) divided by the speed of light (c) in addition to said pulse width
Figure imgf000002_0001
3. The system of claim 1 , wherein: said pulse like light energy defines a substantial pulse width (Tiaser), aπcl a pulse form; and said camera is enabled to gate detection of said pulse like light energy reflected from images of objects, with a gating time span (Tu), an OFF time span (T0iϊ), and a synchronization timing of the gating with respect to said pulse like light energy; and wherein at least one of said delay timing, said pulse width, said pulse form, said gating time span (Tu), said OFF time span (T0rf), and said synchronization timing, is determined according to said depth of a field.
4. The system of claim 3, wherein said determination according to said depth of a field is dynamic.
37
5. The system of claim 1, wherein said a pulse like light energy is a non-visible light and said light received in said camera is non-visible light.
6. The system of claim 1 , wherein said light source is a laser generator.
7. The system of claim 1, comprising a display apparatus for displaying images derived from the light received in said camera.
8. The system of claim 1 , wherein said gating is utilized to create a system's sensitivity as a function of range, through synchronization between the timing of said pulse like light energy and the timing of said camera, whereby - received light energy reflected from objects in the short range will be lower then received light energy reflected from objects in the long range.
9. The system of claim I , wherein said the pulse width (Tιaser) of said pulse like light energy is substantially defined in accordance with the following equation -
I _I . Ro — R mill . j
C
10. The system of claim 1, wherein said camera is selected from the group consisting of CMOS camera and CCD camera.
11. The system of claim 1 , wherein said camera is a gated image intensifier.
12. The system of claim 1 , wherein said camera receives several pulses of said pulse like light energy reflected from objects during said gating time span.
13. The system of claim 11, wherein said image intensifier gating time spans (Tu, TDff) are substantially defined in accordance with the following equations -
_ „ . R max— R min .
Tu = 2( )
38
Figure imgf000004_0001
14. The system of claim 1, comprising a narrow band pass filter functionally connected to said camera.
15. The system of claim 7, wherein said display apparatus is a Head Up Display apparatus.
16. The system of claim 7, wherein said display apparatus is a LCD displays apparatus.
17. The system of claim 7, wherein said display apparatus is implemented with a planar optic apparatus.
18. The system of claim 7, wherein said display apparatus is a flat optic apparatus.
19. The system of claim 1 , comprising at least one ambience light sensor.
20. The system of claim 1 , comprising a pulse detector for detection of pulses emitting from similar system mounted on an approaching vehicle.
21. The system of claim 1, comprising an interface to a vehicle computer system (automotive BUS).
22. The system of claim 1 , comprising a power supply unit.
23. The system of claim 1 , comprising an image-processing unit.
24. The system of claim I , comprising a spatial modulator shutter.
25. The system of claim 1, comprising a spatial light modulator.
26. A vehicle mounted imaging method, the method comprising: emitting a light pulse to a target area; receiving at least one image from a reflection of said light pulse reflected from objects within a depth of a field to be imaged, said depth of field having a minimal range (Rm ); and gating detection of images received, by a gated camera starting, to detect light after a delay timing of the gating with respect to said reflection of said light pulse substantially given by the time it takes said light pulse to reach said minimal range (Rmin) and complete reflecting back to said camera from said minimal range (R„,in); and intensifying said images received.
27. The method of claim 25, wherein said light pulse defines a substantial pulse width (T aser) commencing at a start time (To); said delay timing is substantially given by the time elapsing from said start time (To) until twice said minimal range (Rnljn) divided by the speed of light (c) in addition to said pulse width (TLaSer) (T[Mller-i ). c
* 28. The system of claim 1 , wherein: said pulse like light energy defines a substantial pulse width (Tu^crX and a pulse form; and said procedure of gating comprises a gating time span (Tu), an OFF time span (Toff), and a synchronization timing of the gating with respect to said pulse like light energy; and further comprising the procedure of determining according to said depth of a field, at least one of said delay timing, said pulse width, said pulse form, said gating time span (Tu), said OFF time span (T0ff), and said synchronization timing.
29. The method of claim 26, wherein said gating is utilized to create sensitivity as a function of range, through synchronization between the timing of said light pulse and the timing of said gated camera, whereby - received images from a reflections of said light pulse emitted from objects in the short range will be fewer then received images from a reflections of said light pulse emitted from objects in the long range.
30. The method of claim 26, comprising calculating said light pulse width (T]aser) substantially in accordance with the following equation -
Figure imgf000006_0001
31. The method of claim 26, comprising controlling said gating time span (ON time, Tπ) and an interval (OFF time, T0ff) of said gated camera, substantially in accordance with the following equations -
R l R,
Tu = 20
Figure imgf000006_0002
32. The method of claim 26, comprising displaying said received at least one image in a video frame.
33. The method of claim 26, comprising lowering the cycle of said light pulse.
34. The method of claim 26, comprising lowering the width of said light pulse cycle.
35. The method of claim 26, comprising changing the form of said light pulse by changing its pattern.
41
36. The method of claim 26, comprising changing the form of said light pulse by changing its shape.
37. The method of claim 26, comprising processing said at least one image by an image processor.
38. The method of claim 37, wherein said image processing includes a two-frame exposure sequence.
39. The method of claim 26, comprising determining if other light pulses are present in said target area.
40. The method of claim 26, comprising determining ambient light in said target area.
41. The method of claim 26, comprising filtering received wavelengths of received reflections.
42. The method of claim 26, comprising enabling said image intensifying in a single video image frame during a gating time span (Tπ).
43. The method of claim 26, comprising implementing said image intensifying in a single video image frame.
44. The method of claim 26, comprising controlling the number of exposures received on said image intensifying.
45. The method of claim 26, comprising processing of images received on said image intensifying.
46. The method of claim 26, comprising customizing the sensitivity of said image intensifying.
42
47. The method of claim 46, wherein said sensitivity customization is selected from the group of processes consisting of changing the form of said light pulse, changing a gating time span (Tu), changing an OFF time interval of said gated camera (T0rr), changing a light pulse width (T aser) of said light pulse, changing said delay timing, and changing a synchronization timing between said gating and said emitting, or a combination thereof.
48. The method of claim 26, comprising overcoming glare from alternative light pulses, by locally darkening the entrance of said image intensifier.
49. The method of claim 26, comprising overcoming glare from other light pulses by polarizing light entering said image intensifier.
50. The method of claim 26, comprising overcoming glare from other light pulses by applying statistical techniques.
51. The method of claim 26, comprising overcoming glare from other light pulses by applying synchronizing techniques.
52. The method of claim 26, comprising controlling radiation safety by adjusting the intensity of said light pulses according to the cruising speed of said vehicle.
53. The method of claim 26, comprising displaying said at least one image using holographic based flat-optics technology,
43
PCT/IL2003/000639 2002-08-05 2003-08-05 Vehicle mounted night vision imaging system and method WO2004013654A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE60319238T DE60319238T2 (en) 2002-08-05 2003-08-05 Night vision imaging system and method for mounting in a vehicle
US10/523,340 US7733464B2 (en) 2002-08-05 2003-08-05 Vehicle mounted night vision imaging system and method
AU2003247148A AU2003247148A1 (en) 2002-08-05 2003-08-05 Vehicle mounted night vision imaging system and method
EP03766603A EP1540373B1 (en) 2002-08-05 2003-08-05 Vehicle mounted night vision imaging system and method
JP2004525727A JP4498135B2 (en) 2002-08-05 2003-08-05 On-vehicle night vision image processing system and method
IL165859A IL165859A (en) 2002-08-05 2004-12-19 Vehicle mounted night vision imaging system and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40070702P 2002-08-05 2002-08-05
US60/400,707 2002-08-05

Publications (2)

Publication Number Publication Date
WO2004013654A1 WO2004013654A1 (en) 2004-02-12
WO2004013654B1 true WO2004013654B1 (en) 2004-03-25

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PCT/IL2003/000639 WO2004013654A1 (en) 2002-08-05 2003-08-05 Vehicle mounted night vision imaging system and method

Country Status (8)

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US (1) US7733464B2 (en)
EP (1) EP1540373B1 (en)
JP (2) JP4498135B2 (en)
AT (1) ATE386951T1 (en)
AU (1) AU2003247148A1 (en)
DE (1) DE60319238T2 (en)
ES (1) ES2301835T3 (en)
WO (1) WO2004013654A1 (en)

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