LIGHT MEASURING APPARATUS AND LIGHT MEASURING METHOD
First Claim
1. A light measuring apparatus comprising:
- a light source that emits a light with a known spectrum toward a road surface;
a first light receiver that receives a first reflected light that is a reflected light of the known light reflected from said road surface;
a second light receiver that receives a second reflected light that is a reflected light of an environmental light reflected from said road surface;
a storage unit that previously stores data on the spectrum of said known light; and
a calculator that calculates a reflectance spectrum of the light of said road surface from a spectrum of said first reflected light received by said first light receiver and the spectrum of said known light stored in said storage unit, and calculates a spectrum of said environmental light from a spectrum of said second reflected light received by said second light receiver and the calculated reflectance spectrum of the light of said road surface.
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Accused Products
Abstract
A light with a known spectrum is emitted from a light source toward a road surface, a first reflected light that is a reflected light of the known light reflected from the road surface is received by a first light receiver, and a reflectance spectrum of the light of the road surface is calculated from a spectrum of the first reflected light received by the first light receiver and the spectrum of the known light stored in the storage unit. A second reflected light that is reflected light of an environmental light reflected from the road surface is received by a second light receiver, and a spectrum of the environmental light is calculated from a spectrum of the second reflected light received by the second light receiver and the calculated reflectance spectrum of the light of the road surface.
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Citations
8 Claims
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1. A light measuring apparatus comprising:
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a light source that emits a light with a known spectrum toward a road surface; a first light receiver that receives a first reflected light that is a reflected light of the known light reflected from said road surface; a second light receiver that receives a second reflected light that is a reflected light of an environmental light reflected from said road surface; a storage unit that previously stores data on the spectrum of said known light; and a calculator that calculates a reflectance spectrum of the light of said road surface from a spectrum of said first reflected light received by said first light receiver and the spectrum of said known light stored in said storage unit, and calculates a spectrum of said environmental light from a spectrum of said second reflected light received by said second light receiver and the calculated reflectance spectrum of the light of said road surface. - View Dependent Claims (2, 3, 4)
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5. A light measuring method comprising:
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emitting a light with a known spectrum from a light source toward a road surface; receiving a first reflected light that is a reflected light of the known light reflected from said road surface with a first light receiver; calculating a reflectance spectrum of said road surface from a spectrum of said first reflected light received by said first light receiver and the spectrum of said known light previously stored in a storage unit; receiving a second reflected light that is a reflected light of an environmental light reflected from said road surface with a second light receiver; and calculating a spectrum of said environmental light from a spectrum of said second reflected light received by said second light receiver and the calculated reflectance spectrum of the light of said road surface. - View Dependent Claims (6, 7, 8)
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Specification