Derivation and clinical application of special imaging by means of digital cameras and Image J freeware for quantification of erythema and pigmentation

Yamamoto, Tadamasa; Takiwaki, Hirotsugu; Arase, Seiji; Ohshima, Hiroshi

doi:10.1111/j.1600-0846.2007.00256.x

Cited by 103 publications

(128 citation statements)

References 11 publications

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“…Quantifying pigmentation phenotypes from digital photographs was proposed recently [21], and so far has been successfully applied to genetic studies of eye [18] and skin colors [19]. This method has obvious advantages in terms of cost, time efficiency, and portability, but -if not considered adequately in the design of the image collection -can also have disadvantages regarding noise variance being introduced by various source of environmental lights [22]. For example, the intensity of camera flashes may not be the same even if they were produced by the same camera, and the distance between flash and volunteer can influence the lightening condition and thus the color information collected.…”

Section: Pigmentation Phenotypes: Quantification and Normalization Mamentioning

confidence: 99%

Colorful DNA polymorphisms in humans

Liu

Wen

Kayser

2013

Seminars in Cell & Developmental Biology

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a b s t r a c tIn this review article we summarize current knowledge on how variation on the DNA level influences human pigmentation including color variation of iris, hair, and skin. We review recent progress in the field of human pigmentation genetics by focusing on the genes and DNA polymorphisms discovered to be involved in determining human pigmentation traits, their association with diseases particularly skin cancers, and their power to predict human eye, hair, and skin colors with potential utilization in forensic investigations.

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Section: Pigmentation Phenotypes: Quantification and Normalization Mamentioning

confidence: 99%

Colorful DNA polymorphisms in humans

Liu

Wen

Kayser

2013

Seminars in Cell & Developmental Biology

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“…According to the spectrum analysis of human skin by Takiwaki, Overgaard et al [14], the principle was to use red light with wavelength of 655nm and green light with wavelength of 568nm to determine its value (log value), referring to EI = log10 (1 / G) -log10 (1 / R); MI = log10 (1 / R), where G and R represented the intensity of reflected green light and red light, respectively. Lower measured value indicated a reduction in the pigment content of a skin [15,16]. In addition, the skin water content detection probe (CM825) was connected to measure the skin surface conductivity [17].…”

Section: Skin Testing Equipmentsmentioning

confidence: 99%

Application of Perceptual Evaluation for Skin Assessment of Threaded Skin

Lin

Chiou

2018

IJAE

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Abstract:The aim of the present study was to evaluate the changes in the physiological parameters and Kansei evaluation of the skin before and after the technique of facial threading. Sixty female subjects participated in this study. The changes of skin roughness, melanin index, erythema index and water retention were measured before and after the experiment, and subject's perception of the beauty technique including tactile, visual, and overall sensation was also evaluated. The results showed significant reduction in the roughness of the skin after facial treatment. The tactile and visual perceptual evaluation of the face was significantly improved. The result of the overall comprehensive perception showed that 60% of the subjects felt smooth skin, 5% felt whiter skin and 30% felt smoother and whiter skin. The visual perception of a smoother, white, and bright skin after the procedure proved that perceptual evaluation for skin was a necessary assessment.

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“…Over the last decade, non-invasive instrumentation has been utilized to assess pigmentation in vivo including spectrophotometry [3] , colorimetry [4] , skin color scale chart [5] , fiber optic sensor [6] and digital imaging with RGB color space analysis [7,8] .…”

Section: Introductionmentioning

confidence: 99%

Digital dermoscopy to determine skin melanin index as an objective indicator of skin pigmentation

et al. 2016

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Clinical assessment of skin photosensitivity is subjectively determined by erythema and tanning responses to sunlight recalled by the subject, alternatively known as Fitzpatrick Skin Phototype (SPT). Responses may be unreliable due to recall bias, subjective bias by clinicians and subjects, and lack of cultural sensitivity of the questions. Analysis of red-green-blue (RGB) color spacing of digital images may provide an objective determination of SPT. This paper presents the studies to assess the melanin index (MI), as determined by RGB images obtained by both standard digital camera as well as by videodermoscope, and to correlate the MI with SPT based upon subjects' verbal responses to standardized questions administered by a dermatologist.A sample of subjects representing all SPTs I-VI was selected. Both the digital camera and videodermoscope were calibrated at standard illumination, light source and white balance. Images of constitutive skin of the upper ventral arm were taken of each subject using both instruments. The studies showed that 58 subjects (20 M, 38 F) were enrolled in the study (mean age: 47 years; range: 20-89), stratified to skin phototype I-VI. MI obtained by using both digital camera and videodermoscope increased significantly as the SPT increased (p = 0.004 and p < 0.0001, respectively) and positively correlated with dermatologist-assessed SPT (Spearman correlation, r = 0.48 and r = 0.84, respectively). Digital imaging can quantify melanin content in order to quantitatively approximate skin pigmentation in all skin phototypes including Type VI skin. This methodology holds promise as a simple, non-invasive, rapid and objective approach to reliably determine skin phototype and, with further investigation, may prove to be both practical and useful in the prediction of skin cancer risk.

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Derivation and clinical application of special imaging by means of digital cameras and Image J freeware for quantification of erythema and pigmentation

Abstract: EI and MI images are reliable and useful for quantifying erythema and pigmentation, if obtained under constant and consistent conditions. Apart from financial benefits, this method has many advantages and greater clinical utility in comparison with reflectance instruments.

Cited by 103 publications

References 11 publications

Colorful DNA polymorphisms in humans

Colorful DNA polymorphisms in humans

Application of Perceptual Evaluation for Skin Assessment of Threaded Skin

Digital dermoscopy to determine skin melanin index as an objective indicator of skin pigmentation

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