Optics: measuring and testing – Of light reflection – With diffusion
Patent
1992-05-29
1994-06-21
McGraw, Vincent P.
Optics: measuring and testing
Of light reflection
With diffusion
356448, G01N 2147, G01N 2155
Patent
active
053232305
ABSTRACT:
A method of measuring the density of light in a visible region reflected from a planar image recorded on an image-recording material. A reference calibration plate, having known reflection densities for types of wavelengths and exhibiting spectral absorption in the invisible region, is placed in a plane. Light in a predetermined invisible region is applied to the reference calibration plate, and a quantity of light in the predetermined invisible region reflected from the reference calibration plate is determined. The recording material is placed at the same position and a quantity of light in the predetermined invisible region reflected from the recording material is determined. The density of light, to be set, in the visible region reflected from the planar image is corrected in correspondence with a difference in the quantity of light between the light in the predetermined invisible region reflected from the reference calibration plate and the light in the predetermined invisible region reflected from the planar image as well as with the difference in the quantity of reflected light on the basis of the difference in the spectral absorption.
Fuji Photo Film Co. , Ltd.
Hantis K. P.
McGraw Vincent P.
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