CA2078638A1 - Distance measuring method and a distance measuring apparatus - Google Patents

Distance measuring method and a distance measuring apparatus

Info

Publication number
CA2078638A1
CA2078638A1 CA2078638A CA2078638A CA2078638A1 CA 2078638 A1 CA2078638 A1 CA 2078638A1 CA 2078638 A CA2078638 A CA 2078638A CA 2078638 A CA2078638 A CA 2078638A CA 2078638 A1 CA2078638 A1 CA 2078638A1
Authority
CA
Canada
Prior art keywords
image
lens
distance measuring
distance
images
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA2078638A
Other languages
French (fr)
Other versions
CA2078638C (en
Inventor
Shigeru Sasaki
Takashi Toriu
Yoshiyuki Ohta
Masaki Watanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Shigeru Sasaki
Takashi Toriu
Yoshiyuki Ohta
Masaki Watanabe
Fujitsu Limited
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 Shigeru Sasaki, Takashi Toriu, Yoshiyuki Ohta, Masaki Watanabe, Fujitsu Limited filed Critical Shigeru Sasaki
Publication of CA2078638A1 publication Critical patent/CA2078638A1/en
Application granted granted Critical
Publication of CA2078638C publication Critical patent/CA2078638C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
    • G02B7/365—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals by analysis of the spatial frequency components of the image
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C3/00—Measuring distances in line of sight; Optical rangefinders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals
    • H04N23/673—Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/80—Exterior conditions
    • B60G2400/82—Ground surface
    • B60G2400/823—Obstacle sensing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2401/00—Indexing codes relating to the type of sensors based on the principle of their operation
    • B60G2401/14—Photo or light sensitive means, e.g. Infrared
    • B60G2401/142—Visual Display Camera, e.g. LCD
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/22—Braking, stopping
    • B60G2800/222—Braking, stopping during collision
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/24—Steering, cornering
    • B60G2800/242—Obstacle avoidance manoeuvre

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Signal Processing (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Optical Distance (AREA)
  • Automatic Focus Adjustment (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

A distance data is obtained from an object to a lens by obtaining an image of the object by an image input unit for forming an image of the object through the lens on an image receiving plane. The present method inputs two observed images Is and Is' with different blurs from the image input unit by making a position of the lens, a position of the image receiving plane with regard to the article different by a minute distance .DELTA.z and performs a filtering process by applying filter to the two input observed images Is and Is', thereby providing two output images Fs and Fs' and calculates the distance a up to the object by using two output images Fs and Fs' obtained by the filtering process based on the relation between the two output images Fs and Fs' and radius s of the blur and the distance a from the lens to the object.
CA002078638A 1991-09-20 1992-09-18 Distance measuring method and a distance measuring apparatus Expired - Fee Related CA2078638C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP03241289A JP3110095B2 (en) 1991-09-20 1991-09-20 Distance measuring method and distance measuring device
JP03-241289 1991-09-20

Publications (2)

Publication Number Publication Date
CA2078638A1 true CA2078638A1 (en) 1993-03-21
CA2078638C CA2078638C (en) 2000-01-25

Family

ID=17072055

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002078638A Expired - Fee Related CA2078638C (en) 1991-09-20 1992-09-18 Distance measuring method and a distance measuring apparatus

Country Status (6)

Country Link
US (1) US5576975A (en)
EP (1) EP0533590B1 (en)
JP (1) JP3110095B2 (en)
KR (1) KR970001140B1 (en)
CA (1) CA2078638C (en)
DE (1) DE69208005T2 (en)

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Also Published As

Publication number Publication date
EP0533590B1 (en) 1996-01-31
DE69208005T2 (en) 1996-06-13
JPH0579838A (en) 1993-03-30
KR970001140B1 (en) 1997-01-29
DE69208005D1 (en) 1996-03-14
EP0533590A2 (en) 1993-03-24
JP3110095B2 (en) 2000-11-20
KR930006434A (en) 1993-04-21
EP0533590A3 (en) 1993-05-12
US5576975A (en) 1996-11-19
CA2078638C (en) 2000-01-25

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