Investigation into the scattering of light by human hair

Bustard, Helen K.; Smith, R. W.

doi:10.1364/ao.30.003485

Cited by 29 publications

(15 citation statements)

References 2 publications

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“…It is composed of flat cells that overlap like roof shingles ( Figure 2) and make the fiber appear as a nested set of cones. Because of their overlapped arrangement, the surfaces of the scales deviate slightly but systematically from the overall normal of the fiber's surface, tilting their surfaces toward the root end of the fiber by approximately 3 • [Bustard and Smith 1991;Robbins 1994].…”

Section: Hair Fibers and Fiber Scatteringmentioning

confidence: 99%

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Light scattering from human hair fibers

et al. 2003

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Light scattering from hair is normally simulated in computer graphics using Kajiya and Kay's classic phenomenological model. We have made new measurements of scattering from individual hair fibers that exhibit visually significant effects not predicted by Kajiya and Kay's model. Our measurements go beyond previous hair measurements by examining out-of-plane scattering, and together with this previous work they show a multiple specular highlight and variation in scattering with rotation about the fiber axis. We explain the sources of these effects using a model of a hair fiber as a transparent elliptical cylinder with an absorbing interior and a surface covered with tilted scales. Based on an analytical scattering function for a circular cylinder, we propose a practical shading model for hair that qualitatively matches the scattering behavior shown in the measurements. In a comparison between a photograph and rendered images, we demonstrate the new model's ability to match the appearance of real hair.

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Section: Hair Fibers and Fiber Scatteringmentioning

confidence: 99%

“…Second, there is a secondary lobe that occurs on the other side of the specular direction. Bustard and Smith [1991] have observed that the first peak preserves polarization, whereas the second peak is depolarized. Both groups also observed that the secondary highlight is not present in black hair.…”

Section: Introductionmentioning

confidence: 98%

Light scattering from human hair fibers

et al. 2003

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“…For a number of decades, hair fiber has been the subject of intense scientific research in dermatology and cosmetology. [1][2][3] In particular, structural characterization of hair has been of special interest because the morphological features of hair have provided important biophysical clues for early diagnosis of skin disease 4 and breast cancer, 5 cosmetic assessment, 6 and forensic examination. 7 Classically, ultrastructural observation of human hair has been widely performed by using scanning electron microscopy (SEM) and transmission electron microscopy (TEM).…”

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confidence: 99%

Qualitative investigation of fresh human scalp hair with full-field optical coherence tomography

Choi

Pi²,

Min

et al. 2012

J. Biomed. Opt.

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Abstract. We have investigated depth-resolved cellular structures of unmodified fresh human scalp hairs with ultrahigh-resolution full-field optical coherence tomography (FF-OCT). The Linnik-type white light interference microscope has been home-implemented to observe the micro-internal layers of human hairs in their natural environment. In hair shafts, FF-OCT has qualitatively revealed the cellular hair compartments of cuticle and cortex layers involved in keratin filaments and melanin granules. No significant difference between black and white hair shafts was observed except for absence of only the melanin granules in the white hair, reflecting that the density of the melanin granules directly affects the hair color. Anatomical description of plucked hair bulbs was also obtained with the FF-OCT in three-dimensions. We expect this approach will be useful for evaluating cellular alteration of natural hairs on cosmetic assessment or diagnosis of hair diseases.

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“…54,55 Instead, human hair was primarily studied using a common confocal setup. 18,[35][36][37][38][39][40][41][42][43][44][45] A confocal setup of collimated transmittance measurement, as shown in Fig. 2, was constructed by Kharin et al 45 to examine the attenuation coefficient of human scalp hair.…”

Section: Measurement Techniquesmentioning

confidence: 99%

Review of human hair optical properties in possible relation to melanoma development

et al. 2018

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Abstract. Immigration and epidemiological studies provide evidence indicating the correlation of high ultraviolet exposure during childhood and increased risks of melanoma in later life. While the explanation of this phenomenon has not been found in the skin, a class of hair has been hypothesized to be involved in this process by transmitting sufficient ultraviolet rays along the hair shaft to possibly cause damage to the stem cells in the hair follicle, ultimately resulting in melanoma in later life. First, the anatomy of hair and its possible contribution to melanoma development, and the tissue optical properties are briefly introduced to provide the necessary background. This paper emphasizes on the review of the experimental studies of the optical properties of human hair, which include the sample preparation, measurement techniques, results, and statistical analysis. The Monte Carlo photon simulation of human hair is next outlined. Finally, current knowledge of the optical studies of hair is discussed in the light of their possible contribution to melanoma development; the necessary future work needed to support this hypothesis is suggested.

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Investigation into the scattering of light by human hair

Cited by 29 publications

References 2 publications

Light scattering from human hair fibers

Light scattering from human hair fibers

Qualitative investigation of fresh human scalp hair with full-field optical coherence tomography

Review of human hair optical properties in possible relation to melanoma development

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