Boots – shoes – and leggings
Patent
1995-10-13
1997-06-03
Voeltz, Emanuel T.
Boots, shoes, and leggings
364525, 355 32, 355 35, 355 77, 355 30, 396 97, 396225, 396231, G01J 100
Patent
active
056361432
ABSTRACT:
There are provided a method and apparatus capable of estimating a color temperature of a photographic light source. A theoretical reference value is obtained which is represented by summation or integration of the product of a spectral energy distribution of an object having a known color temperature, a spectral sensitivity distribution of a photometric system, and a spectral reflectance distribution defined by a certain expression. An actual value is acquired by measuring at least a portion of light reflected from a body which is exposed to light emitted from a light source whose color temperature is to be estimated. Spectral reflectance distributions are calculated for a plurality of color temperatures such that the difference between the theoretical reference value and the actual value becomes minimum. A calculation is performed to obtain the sum of abnormal components of the obtained spectral reflectance distribution whose maximum values exceed 1.0 as an evaluation value for each of the plurality of color temperatures. A color temperature is estimated which corresponds to the minimum value of the evaluation value as the color temperature of the light source whose color temperature is to be estimated.
REFERENCES:
patent: 4648051 (1987-03-01), Wandell et al.
patent: 4992963 (1991-02-01), Funt et al.
patent: 5168303 (1992-12-01), Ikenoue et al.
patent: 5521708 (1996-05-01), Beretta
Fuji Photo Film Co. , Ltd.
Voeltz Emanuel T.
Wachsman Hal D.
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