Bidirectional reflectometry. Part I. A high resolution laser bidirectional reflectometer with results on several optical coatings

Hsia, Jack J.; Richmond, Joseph C.

doi:10.6028/jres.080a.021

Cited by 30 publications

(18 citation statements)

References 2 publications

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“…If possible, also try to take into account any supplemental data that might indicate how the value of fr may vary with the directions involved in the differences between the two geometries. Some practical problems and some measurement results are reported by Hsia and Richmond [27]. Part II of their paper [27] is a useful bibliography on diffuse reflectance.…”

Section: Extrapolation To Different Geometriesmentioning

confidence: 99%

“…For a surface element dA, small enough so that there is no significant variation of radiance L across its surface, it is easily shown that frl{ei,ct>i;dr,4>r) =frL(ei,<l^i;er,<t>r)-COsdr [sr""]. (27) It may also be useful to express reflectances and reflectance factors in terms of the BRIDF/r/. As we have seen, it is adequate to have just the expression for the biconical quantity, since the other eight follow readily from it, in each case.…”

Section: A Mccamy's Notation For Right Circular Conesmentioning

confidence: 99%

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Geometrical considerations and nomenclature for reflectance

Nicodemus¹,

Richmond²,

Hsia³

et al. 1977

1,191

939

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A unified approach to the specification of reflectance, in terms of both incident-and reflectedbeam geometry, is presented. Nomenclature to facilitate this approach is proposed. Under specified conditions-including uniform irradiance, a uniform, isotropic, plane surface, and allowance for edge effects due to sub-surface scattering-the geometrical reflecting properties of a reflecting surface are readily characterized or specified in terms of the bidirectional reflectancedistribution function (BRDF). The BRDF is denoted symbolically as fr:

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Section: Extrapolation To Different Geometriesmentioning

confidence: 99%

Section: A Mccamy's Notation For Right Circular Conesmentioning

confidence: 99%

Geometrical considerations and nomenclature for reflectance

Nicodemus¹,

Richmond²,

Hsia³

et al. 1977

1,191

939

View full text Add to dashboard Cite

show abstract

“…Radiometric functions such as bidirectional reflectance distribution function (BRDF) [NRH*77], spatially varying BRDF (SVBRDF) and bidirectional texture function (BTF) [DvGNK99] are commonly used to represent the appearance of many classes of materials, increasing the photo‐realism of renderings. Measuring the reflectance properties of a material is potentially expensive and time‐consuming, in particular using ad hoc devices such as gonioreflectometers [TS67, HR76, Foo97].…”

Section: Introductionmentioning

confidence: 99%

Turning a Digital Camera into an Absolute 2D Tele‐Colorimeter

Guarnera

Bianco

Schettini

2018

Computer Graphics Forum

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We present a simple and effective technique for absolute colorimetric camera characterization, invariant to changes in exposure/aperture and scene irradiance, suitable in a wide range of applications including image‐based reflectance measurements, spectral pre‐filtering and spectral upsampling for rendering, to improve colour accuracy in high dynamic range imaging. Our method requires a limited number of acquisitions, an off‐the‐shelf target and a commonly available projector, used as a controllable light source, other than the reflected radiance to be known. The characterized camera can be effectively used as a 2D tele‐colorimeter, providing the user with an accurate estimate of the distribution of luminance and chromaticity in a scene, without requiring explicit knowledge of the incident lighting power spectra. We validate the approach by comparing our estimated absolute tristimulus values (XYZ data in cd/m2) with the measurements of a professional 2D tele‐colorimeter, for a set of scenes with complex geometry, spatially varying reflectance and light sources with very different spectral power distribution.

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“…The construction of the device was described by Nicodemus and used in the experimental development of the reflection models by Torrance and Sparrow [TS67], Blinn [Bli77], He et al [HTSG91] and many others. A detailed setup is described by Hsia and Richmond [HR76]. It consists of a light source (a laser beam), a sample material placed on the sample holder mounted on a turntable which rotates around the vertical axis and a detector which captures data about reflected light from the sample.…”

Section: Gonioreflectometersmentioning

confidence: 99%

BRDF Representation and Acquisition

Guarnera

Ghosh

et al. 2016

Computer Graphics Forum

162

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Photorealistic rendering of real world environments is important in a range of different areas; including Visual Special effects, Interior/Exterior Modelling, Architectural Modelling, Cultural Heritage, Computer Games and Automotive Design. Currently, rendering systems are able to produce photorealistic simulations of the appearance of many real‐world materials. In the real world, viewer perception of objects depends on the lighting and object/material/surface characteristics, the way a surface interacts with the light and on how the light is reflected, scattered, absorbed by the surface and the impact these characteristics have on material appearance. In order to re‐produce this, it is necessary to understand how materials interact with light. Thus the representation and acquisition of material models has become such an active research area. This survey of the state‐of‐the‐art of BRDF Representation and Acquisition presents an overview of BRDF (Bidirectional Reflectance Distribution Function) models used to represent surface/material reflection characteristics, and describes current acquisition methods for the capture and rendering of photorealistic materials.

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Bidirectional reflectometry. Part I. A high resolution laser bidirectional reflectometer with results on several optical coatings

Cited by 30 publications

References 2 publications

Geometrical considerations and nomenclature for reflectance

Geometrical considerations and nomenclature for reflectance

Turning a Digital Camera into an Absolute 2D Tele‐Colorimeter

BRDF Representation and Acquisition

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