Extended Summary 本文は pp.1749-1755 -37- Development of an Image Colorimeter for Noncontact Skin Color Measurement and Application to the Dermatological Treatment Makio Akimoto Member ([email protected]) Yu Chen Student Member ([email protected]) Michio Miyazaki Member ([email protected]) Toyonobu Yamashita Non-member ([email protected]) Michio Miyakawa Member ([email protected]) Mieko Hata Non-member ([email protected]) Keywords : skin color, quantification, video camera, chemical peeling, low power laser Skin color is a clinical parameter of great importance to the dermatology and cosmetic scientist. Since color is subjective sensory and neurophysiological perception by a person, the evaluation of color is highly observer dependent. The most studied and explored field is color assessment, which is achieved either by reflectance spectrophotometry of the optical spectrum of visible light reflected by the skin, or by reflectance tristimulus colorimetry. Skin generally is not a homogeneous surface structure, with hair, blood vessels, biemishes spots, hypo- and hyperpigmentation spots, and scars. These methods give quantitative information on the color but are limited to a small analysis surface. In order to avoid these constrains we studied the development of several applications; we used image analysis, which is commonly used in dermatology either to assist diagnosis of erythema and pigmented skin lesions or to evaluate the topography of human skin. This technique allows us to study skin areas of various sizes, to take measurements without any contact with the skin and to analyze the image pixel by pixel, providing quantitative information according to localization. A new imaging colorimeter based on a charge coupled device (CCD) color camera with tristumulus color analysis, has been developed in order to overcome the drawbacks and ploblems of earlier colorimeters (1) . Figure 1 shows the experimental system. Combining imaging and colorimetry method, the acquired image is calibrated and corrected, under several ambient light conditions, providing non contact reproducible color measurements, free of the errors and the limitations present in conventional colorimeters. This instrument combines tristimulus color analysis with full color visualization of the skin area measured. Quantitative colorimetric requires the transformation of the RGB components obtained by a video color camera into CIE-LAB colorimetric space. The expression of each coordinate of the L*a*b* space according to RGB was carried out by a statistical method of polynomial approximations. The technique has been used in hospital clinics for a wide variety of patients. In the field of the dermatology in recent years, new cure technology such as the laser cure, the chemical pea ring is introduced and the judgment of the cure effect becomes an important element. Medical lasers potentially hazardous and should be operated by personnel familiar with the principles and practice of laser treatment. Advances low energy lasers have increased the safety and popularity of skin resurfacing adding to established treatments such as dermabrasion and chemical peels (2) . The constant technological improvement of software and video color cameras makes image analysis a good technology for the quantitative assessment of properties and visual effects of diagnosis evaluations. These features highlight the potential of the imaging colorimeters as clinical and research tools for the standardization of clinical diagnosis and for the objective evaluation of treatment effectiveness. References (1) L. Yang, M. Egawa, M. Akimoto, and M. Miyakawa : An Imaging Colorimeter for Noncontact Skin Color Measurement, Optical Review, Vol.10, pp.554-561 (2003) (2) M. Hata, S. Ishizaki, M. Akimoto, and E. Sasaki : Low power laser treatment for atopic dermatitis, Japan Laser Surgery and Medicine, Vol.24, pp.31-36 (2003) (in Japanese) Real-time imaging processing board Object Camera controller Computer 3CCD element CCD camera Halogen lamp Lens Filter Fig. 1. System utilized for the color analysis of the skin consisting of a video camera and personal computer
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Extended Summary 本文は pp.1749-1755
-37-
Development of an Image Colorimeter for Noncontact Skin Color Measurement and Application to the Dermatological Treatment
Keywords : skin color, quantification, video camera, chemical peeling, low power laser
Skin color is a clinical parameter of great importance to the
dermatology and cosmetic scientist. Since color is subjective sensory and neurophysiological perception by a person, the evaluation of color is highly observer dependent. The most studied and explored field is color assessment, which is achieved either by reflectance spectrophotometry of the optical spectrum of visible light reflected by the skin, or by reflectance tristimulus colorimetry. Skin generally is not a homogeneous surface structure, with hair, blood vessels, biemishes spots, hypo- and hyperpigmentation spots, and scars. These methods give quantitative information on the color but are limited to a small analysis surface. In order to avoid these constrains we studied the development of several applications; we used image analysis, which is commonly used in dermatology either to assist diagnosis of erythema and pigmented skin lesions or to evaluate the topography of human skin. This technique allows us to study skin areas of various sizes, to take measurements without any contact with the skin and to analyze the image pixel by pixel, providing quantitative information according to localization.
A new imaging colorimeter based on a charge coupled device (CCD) color camera with tristumulus color analysis, has been developed in order to overcome the drawbacks and ploblems of earlier colorimeters(1). Figure 1 shows the experimental system. Combining imaging and colorimetry method, the acquired image is calibrated and corrected, under several ambient light conditions, providing non contact reproducible color measurements, free of the errors and the limitations present in conventional colorimeters. This instrument combines tristimulus color analysis with full color visualization of the skin area measured. Quantitative colorimetric requires the transformation of the RGB components obtained by a video color camera into CIE-LAB colorimetric space. The expression of each coordinate of the L*a*b* space according to RGB was carried out by a statistical method of polynomial approximations. The technique has been used in hospital clinics for a wide variety of patients. In the field of the dermatology in recent years, new cure technology such as the laser cure, the chemical pea ring is introduced and the judgment of the cure effect becomes an important element. Medical lasers potentially
hazardous and should be operated by personnel familiar with the principles and practice of laser treatment. Advances low energy lasers have increased the safety and popularity of skin resurfacing adding to established treatments such as dermabrasion and chemical peels(2). The constant technological improvement of software and video color cameras makes image analysis a good technology for the quantitative assessment of properties and visual effects of diagnosis evaluations. These features highlight the potential of the imaging colorimeters as clinical and research tools for the standardization of clinical diagnosis and for the objective evaluation of treatment effectiveness.
References
(1) L. Yang, M. Egawa, M. Akimoto, and M. Miyakawa : An Imaging Colorimeter for Noncontact Skin Color Measurement, Optical Review, Vol.10, pp.554-561 (2003)
(2) M. Hata, S. Ishizaki, M. Akimoto, and E. Sasaki : Low power laser treatment for atopic dermatitis, Japan Laser Surgery and Medicine, Vol.24, pp.31-36 (2003) (in Japanese)
Real-time imaging processing board
Object
Camera controller
Computer
3CCDelement
CCD camera
Halogenlamp
Lens
Filter
Fig. 1. System utilized for the color analysis of the skin consisting of a video camera and personal computer
電学論 C,127 巻 10 号,2007 年 1749
画像による皮膚色測定装置の皮膚科治療への応用
正 員 秋本眞喜雄* 学生員 陳 愈*
正 員 宮崎 道雄* 非会員 山下 豊信**
正 員 宮川 道夫** 非会員 畑 三恵子***
Development of an Image Colorimeter for Noncontact Skin Color Measurement and Application to the Dermatological Treatment
The skin is unique as an organ that is highly accessible to direct visual inspection with light. Visual
inspection of cutaneous morphology is the mainstay of clinical dermatology, but relies heavily on subjective assessment by the skilled dermatologists. We present an imaging colorimeter of non-contact skin color measuring system and some experimented results using such instrument. The system is comprised by a video camera, light source, a real-time image processing board, magneto optics disk and personal computer which controls the entire system. The CIE-L*a*b* uniform color space is used. This system is used for monitoring of some clinical diagnosis. The instrument is non-contact, easy to operate, and has a high precision unlike the conventional colorimeters. This instrument is useful for clinical diagnoses, monitoring and evaluating the effectiveness of treatment.
キーワード:皮膚色,定量化,ビデオカメラ,ケミカルピーリング,低出力レーザー Keywords:skin color, quantification, video camera, chemical peeling, low power laser
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