Perceptual gloss space BRDF projection, uniformity validation, and lightness distance metric

Fores, Adria; Fairchild, Mark D.; Tastl, Ingeborg

doi:10.1145/2628257.2628355

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“…A projection for arbitrary BRDFs into this gloss space was defined in Fores et al, 19 enabling the representation of measured data and analytical BRDF models in the space and enabling the computation of the perceptual gloss difference between arbitrary materials. The projection is based on the relation between gloss ASTM standards and the d dimension of the uniform gloss space defined in Pellacini et al 1 The ASTM standards of distinctness of image gloss (DOI), bloom, haze, and diffuseness are described as the ratio of light reflected at 0.3 • , 2 • , 5 • , and 15 • away from the mirror direction to the light reflected at the mirror direction at 30 • .…”

Section: Projection To a Gloss Spacementioning

confidence: 99%

“…Due the lack of measurements for the features located at 10 • and 15 • with the Rhopoint IQ, and additional feature within the angular range of the Rhopoint IQ was added at 7 • to increase the accuracy of the relation between ASTM standards and d. Rhopoint IQ projection Rhopoint IQ data Murakami projection Murakami data Incident Direction Figure 6. Projections into the Lcd gloss space of the Rhopoint IQ and Murakami measurements using the projection described in Fores et al 19 To avoid overemphasizing the specular peak magnitude, the plots are compressed with the cube root.…”

Section: Projection To a Gloss Spacementioning

confidence: 99%

“…Thus, the projection for arbitrary BRDFs presented in Fores et al 19 can also be used to approximate measured materials without the need to perform non-linear optimization. Figure 6 shows the BRDF shapes for the measured data and its projection to the Lcd space for the Murakami and Rhopoint IQ measurements, and Figure 7 shows the images rendered with the projection of the measured data to the Lcd space for both devices.…”

Section: Projection To a Gloss Spacementioning

confidence: 99%

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An abridged goniometer for material appearance measurements

2015

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Goniospectrophotometers and custom laboratory setups are used to perform BRDF measurements of materials. Those measurements can be used to improve the realism of previews of to be printed 3D objects, and for the accurate representation of real objects in synthetic images. Unfortunately, the expensive nature of those devices and the time required to measure each sample limit its use. This paper presents a cost-effective, fast, and scalable solution to capture material appearance. This technique is based on splitting the material information to capture into two main attributes: color and gloss. A spectrophotometer is used to capture the color of a material, and the raw data of a linear sensor used in a DOI-Gloss-Haze meter is used to obtain BRDF measurements, thus capturing the gloss appearance. Those measurements can later be used to approximate the parameters of analytical BRDF models.The technique is evaluated by comparing its results with high accuracy measurements of a goniospectrophotometer, and the approximations obtained with the high accuracy measurements. A good approximation was obtained when comparing the new technique to a goniospectrophotometer, except for a small underestimation of the peak of the specular lobe on high gloss materials and the limitation to capture the specular lobe width of broad specular lobes of low gloss materials.

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Section: Projection To a Gloss Spacementioning

confidence: 99%

Section: Projection To a Gloss Spacementioning

confidence: 99%

Section: Projection To a Gloss Spacementioning

confidence: 99%

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