JPS56160642A - Road surface condition detector - Google Patents

Road surface condition detector

Info

Publication number
JPS56160642A
JPS56160642A JP6502780A JP6502780A JPS56160642A JP S56160642 A JPS56160642 A JP S56160642A JP 6502780 A JP6502780 A JP 6502780A JP 6502780 A JP6502780 A JP 6502780A JP S56160642 A JPS56160642 A JP S56160642A
Authority
JP
Japan
Prior art keywords
road surface
target
surface condition
pickup device
video signal
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
JP6502780A
Other languages
Japanese (ja)
Other versions
JPS6239896B2 (en
Inventor
Minoru Tanaka
Toshihiko Nishimura
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP6502780A priority Critical patent/JPS56160642A/en
Publication of JPS56160642A publication Critical patent/JPS56160642A/en
Publication of JPS6239896B2 publication Critical patent/JPS6239896B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity

Abstract

PURPOSE:To detect the road surface condition independently of disturbance or the like by providing a target having a light part and a dark part on the road surface, and catching the relative pattern changes of the light reflected therefrom. CONSTITUTION:A target 11 comprising a light part 11A and a dark part 11B is proveded on the road surface 12. An image pickup device 15 picks up the image of the target 11 focused by means of an EE lens 14 which controls the quantity of the light reflected from the road surface. The video signal VS is sampled by means of a quantizer 16, quantized and coded into a plurality of bits, which are inputted to a central processor 18 through an input/output devece 17. The central processor 18 reads a reference pattern signal out from a memory 19 and decides to which road condition pattern the video signal VS coming from the image pickup device 15 corresponds.
JP6502780A 1980-05-14 1980-05-14 Road surface condition detector Granted JPS56160642A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6502780A JPS56160642A (en) 1980-05-14 1980-05-14 Road surface condition detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6502780A JPS56160642A (en) 1980-05-14 1980-05-14 Road surface condition detector

Publications (2)

Publication Number Publication Date
JPS56160642A true JPS56160642A (en) 1981-12-10
JPS6239896B2 JPS6239896B2 (en) 1987-08-25

Family

ID=13275074

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6502780A Granted JPS56160642A (en) 1980-05-14 1980-05-14 Road surface condition detector

Country Status (1)

Country Link
JP (1) JPS56160642A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011149911A (en) * 2010-01-25 2011-08-04 Nec Corp Wetting detector and wetting detection method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4221360Y1 (en) * 1965-09-07 1967-12-08
JPS5132377A (en) * 1974-09-12 1976-03-18 Furukawa Electric Co Ltd Sekisetsu kosookenshutsusuru hoho

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4221360Y1 (en) * 1965-09-07 1967-12-08
JPS5132377A (en) * 1974-09-12 1976-03-18 Furukawa Electric Co Ltd Sekisetsu kosookenshutsusuru hoho

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011149911A (en) * 2010-01-25 2011-08-04 Nec Corp Wetting detector and wetting detection method

Also Published As

Publication number Publication date
JPS6239896B2 (en) 1987-08-25

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