Measuring an appearance property of a surface using a bidirectional reflectance distribution function
First Claim
1. An apparatus for measuring spectral data of a surface, the apparatus comprising:
- one or more light sources for illuminating a surface;
one or more sensors for receiving light reflected by the surface; and
a computer in communication with the plurality of sensors;
wherein the apparatus is adapted to receive light reflected by the surface in each of a plurality of reflectance directions; and
wherein the computer is programmed to calculate a plurality of directional responses of the surface based on the received light in each of the plurality of reflectance directions, wherein each directional response is for a different wavelength or range of wavelengths, and wherein each directional response is calculated based on a vector sum of reflectance vectors over the plurality of reflectance directions at a corresponding wavelength or wavelength range.
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Accused Products
Abstract
An apparatus for measuring a spatially under-sampled Bidirectional Reflectance Distribution Function (BRDF) of a surface. The apparatus may comprise a first light source directed to illuminate the surface from a first illumination direction, and a plurality of sensors positioned to receive light reflected by the surface. The plurality of sensors may comprise first, second and third sensors positioned to receive light reflected by the surface in first, second and third non-coplanar directions. In various embodiments, the apparatus may also comprise a computer in communication with the plurality of sensors. The computer is configured to convert light sensed by the plurality of sensors into a first appearance property of the surface considering the first, second, and third reflectance directions.
62 Citations
32 Claims
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1. An apparatus for measuring spectral data of a surface, the apparatus comprising:
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one or more light sources for illuminating a surface; one or more sensors for receiving light reflected by the surface; and a computer in communication with the plurality of sensors; wherein the apparatus is adapted to receive light reflected by the surface in each of a plurality of reflectance directions; and wherein the computer is programmed to calculate a plurality of directional responses of the surface based on the received light in each of the plurality of reflectance directions, wherein each directional response is for a different wavelength or range of wavelengths, and wherein each directional response is calculated based on a vector sum of reflectance vectors over the plurality of reflectance directions at a corresponding wavelength or wavelength range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for measuring spectral data of a surface, the method comprising:
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receiving at one or more sensors light reflected by a surface in each of a plurality of reflectance directions, calculating, using a computer, a plurality of directional responses of the surface based on the received light in each of the plurality of reflectance directions, wherein each directional response is for a different wavelength or range of wavelengths, and wherein each directional response is calculated based on a vector sum of reflectance vectors over the plurality of reflectance directions at a corresponding wavelength or wavelength range. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification