US 2011/0216323 A1 · LIGHT MEASURING APPARATUS AND LIGHT MEASURING METHOD

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.

Claims8

Dependent claims

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.

3 more elements

A light measuring method comprising:

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.

3 more elements

Dependencies are inferred from the claim text.

Light measuring apparatus and light measuring method

Life of this patent

Light measuring apparatus and light measuring method

Life of this patent

Abstract

Claims8