Specular kurtosis and the perception of hazy gloss

Pascal Barla, PETER VANGORP, Carlos Zubiaga, Roland W. Fleming

Research output: Contribution to conferenceAbstract

Abstract

Previous work on the perception of glossy materials has mostly focused on two dimensions: gloss strength and microscale roughness. However, more advanced reflectance models often include additional parameters for controlling the distribution of reflected light. It remains unknown whether these additional dimensions have a perceptually significant influence on appearance. In particular, among the six types of gloss suggested by Hunter in his seminal book (Hunter, 1975), "haze" remains among the less studied of potentially pertinent material cues. From a physical point of view, hazy reflections are associated with heavy-tailed, or leptokurtic, reflectance functions, as often occurs in semi-polished metals or coated materials. We have investigated gloss haze by rendering movies of irregularly shaped objects made of metallic materials exhibiting more or less leptokurtic reflectance functions. We modeled hazy metals using a two-layered glossy material model with two centered Gaussian-like lobes (Ward, 1992) of different spread. Varying both the (1) relative spread and (2) relative magnitude of the two lobes yielded a 5x5 array of different materials. Subjects rated the following qualities for each material: glossiness, blurriness, haziness, coatedness, polish, and friction. Principal component analysis of the results reveals that haziness is a distinct visual dimension orthogonal to the commonly studied glossiness and blurriness. Coatedness appears to be nearly synonymous with haziness, as this is one of the main physical causes of haze in real world materials. Polish seems to be a combination of glossiness and haziness, as materials go from dull to hazy to highly glossy during the physical polishing process. The inferred tactile quality of friction is apparently uncorrelated with haziness. Our results demonstrate that haze is indeed a distinct perceptual dimension of gloss, which is systematically related to the kurtosis of the specular lobe.
Original languageEnglish
DOIs
Publication statusPublished - 31 Aug 2016
Event16th Annual Meeting of the Vision Sciences Society - St. Pete Beach, United States
Duration: 13 May 201618 May 2016

Conference

Conference16th Annual Meeting of the Vision Sciences Society
Abbreviated titleVSS 2016
CountryUnited States
CitySt. Pete Beach
Period13/05/1618/05/16

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haze
reflectance
friction
material
metal
roughness
principal component analysis

Cite this

Barla, P., VANGORP, PETER., Zubiaga, C., & Fleming, R. W. (2016). Specular kurtosis and the perception of hazy gloss. Abstract from 16th Annual Meeting of the Vision Sciences Society, St. Pete Beach, United States. https://doi.org/10.1167/16.12.942
Barla, Pascal ; VANGORP, PETER ; Zubiaga, Carlos ; Fleming, Roland W. / Specular kurtosis and the perception of hazy gloss. Abstract from 16th Annual Meeting of the Vision Sciences Society, St. Pete Beach, United States.
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Barla, P, VANGORP, PETER, Zubiaga, C & Fleming, RW 2016, 'Specular kurtosis and the perception of hazy gloss' 16th Annual Meeting of the Vision Sciences Society, St. Pete Beach, United States, 13/05/16 - 18/05/16, . https://doi.org/10.1167/16.12.942

Specular kurtosis and the perception of hazy gloss. / Barla, Pascal; VANGORP, PETER; Zubiaga, Carlos; Fleming, Roland W.

2016. Abstract from 16th Annual Meeting of the Vision Sciences Society, St. Pete Beach, United States.

Research output: Contribution to conferenceAbstract

TY - CONF

T1 - Specular kurtosis and the perception of hazy gloss

AU - Barla, Pascal

AU - VANGORP, PETER

AU - Zubiaga, Carlos

AU - Fleming, Roland W.

PY - 2016/8/31

Y1 - 2016/8/31

N2 - Previous work on the perception of glossy materials has mostly focused on two dimensions: gloss strength and microscale roughness. However, more advanced reflectance models often include additional parameters for controlling the distribution of reflected light. It remains unknown whether these additional dimensions have a perceptually significant influence on appearance. In particular, among the six types of gloss suggested by Hunter in his seminal book (Hunter, 1975), "haze" remains among the less studied of potentially pertinent material cues. From a physical point of view, hazy reflections are associated with heavy-tailed, or leptokurtic, reflectance functions, as often occurs in semi-polished metals or coated materials. We have investigated gloss haze by rendering movies of irregularly shaped objects made of metallic materials exhibiting more or less leptokurtic reflectance functions. We modeled hazy metals using a two-layered glossy material model with two centered Gaussian-like lobes (Ward, 1992) of different spread. Varying both the (1) relative spread and (2) relative magnitude of the two lobes yielded a 5x5 array of different materials. Subjects rated the following qualities for each material: glossiness, blurriness, haziness, coatedness, polish, and friction. Principal component analysis of the results reveals that haziness is a distinct visual dimension orthogonal to the commonly studied glossiness and blurriness. Coatedness appears to be nearly synonymous with haziness, as this is one of the main physical causes of haze in real world materials. Polish seems to be a combination of glossiness and haziness, as materials go from dull to hazy to highly glossy during the physical polishing process. The inferred tactile quality of friction is apparently uncorrelated with haziness. Our results demonstrate that haze is indeed a distinct perceptual dimension of gloss, which is systematically related to the kurtosis of the specular lobe.

AB - Previous work on the perception of glossy materials has mostly focused on two dimensions: gloss strength and microscale roughness. However, more advanced reflectance models often include additional parameters for controlling the distribution of reflected light. It remains unknown whether these additional dimensions have a perceptually significant influence on appearance. In particular, among the six types of gloss suggested by Hunter in his seminal book (Hunter, 1975), "haze" remains among the less studied of potentially pertinent material cues. From a physical point of view, hazy reflections are associated with heavy-tailed, or leptokurtic, reflectance functions, as often occurs in semi-polished metals or coated materials. We have investigated gloss haze by rendering movies of irregularly shaped objects made of metallic materials exhibiting more or less leptokurtic reflectance functions. We modeled hazy metals using a two-layered glossy material model with two centered Gaussian-like lobes (Ward, 1992) of different spread. Varying both the (1) relative spread and (2) relative magnitude of the two lobes yielded a 5x5 array of different materials. Subjects rated the following qualities for each material: glossiness, blurriness, haziness, coatedness, polish, and friction. Principal component analysis of the results reveals that haziness is a distinct visual dimension orthogonal to the commonly studied glossiness and blurriness. Coatedness appears to be nearly synonymous with haziness, as this is one of the main physical causes of haze in real world materials. Polish seems to be a combination of glossiness and haziness, as materials go from dull to hazy to highly glossy during the physical polishing process. The inferred tactile quality of friction is apparently uncorrelated with haziness. Our results demonstrate that haze is indeed a distinct perceptual dimension of gloss, which is systematically related to the kurtosis of the specular lobe.

U2 - 10.1167/16.12.942

DO - 10.1167/16.12.942

M3 - Abstract

ER -

Barla P, VANGORP PETER, Zubiaga C, Fleming RW. Specular kurtosis and the perception of hazy gloss. 2016. Abstract from 16th Annual Meeting of the Vision Sciences Society, St. Pete Beach, United States. https://doi.org/10.1167/16.12.942