• 제목/요약/키워드: Diffuse reflectance

검색결과 128건 처리시간 0.019초

근적외선 확산반사 분광법을 이용한 흉터치료 평가 (Evaluation of the Scar Treatment using Near Infrared Diffuse Reflectance Spectroscopy)

  • 장익제;윤종인
    • 대한의용생체공학회:의공학회지
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    • 제37권1호
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    • pp.53-60
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    • 2016
  • Monitoring of dermal collagen is important to assess various scar conditions, and many diagnostic methods have been applied to quantify collagen contents in scar tissue. In this study, Monte Carlo simulation was used to evaluate diffuse reflectance distributions in scar condition by a near-infrared laser source. The results showed that the effective distance of the light source and the detector was 2 mm to monitor the various scar conditions using diffuse reflectance spectroscopy. This study may suggest to the optimal design for a near infrared diffuse reflectance spectroscopy during the scar treatment.

간접 확산 조명을 이용한 혼성반사 표면의 3차원 형상 취득 (Obtaining 3-dimensional shape of hybrid reflectance surfaces using indirect diffuse illumination)

  • 김태은;안호근;최종수
    • 한국통신학회논문지
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    • 제21권2호
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    • pp.301-312
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    • 1996
  • A new approach is presented for recovering the 3-D shape from shading image. Photometric Stereo Method (PSM) is generally based on the direct illumination. In this paper, the reflectance function is derived by introduceing the indirect diffuse illumination in PSM and then applied to hybrid reflectance model which consists fo two components; the Lambertian reflectance and the speclar reflectance. Under the hybrid reflectance model and the indirect diffuse illumination circumstances, the 3-D shape of object can be recovered from the suface normal vector extracted from the surface roughness, the surface reflectance ratio, and the intensity value of a pixel. This method is rapid because of using the reference table and simplifies the restriction condition about the reflectance function existing in prior studies. The recovery efficiency in our method is better than that in prior studies. Also, this method is applied to various types of surfaces by defining general reflectance function.

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Shape Recovery

  • Kim, Tae-Eun;Lee, Mal-Lae
    • 한국멀티미디어학회:학술대회논문집
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    • 한국멀티미디어학회 1998년도 춘계학술발표논문집
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    • pp.385-388
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    • 1998
  • The main interest of previous researches for shape from shading was only on Lambertian surface which consists of diffuse reflectance surface. In practice, natural objects have hybrid reflectance, which limits the recovery of shape from intensity distribution[1][2]. In this paper, we propose the method of determining shape using neural network and diffuse illumination. The segmented region of sphere surface is used for training set, which can be determined by shadow line and edge of surface. Diffuse illumination is used to avoid specular spike and highlight which usually cause many problems such as intensity disparities. Diffuse illumination method using flat paper allows us to reduce these phenomena with simple scheme. Neural network and Diffuse illumination method are useful for shape from shading, because it can be applied to objects of unknown reflectance properties, but it is applied only to Torrance-Sparrow style reflectance.

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Evaluation of Diffuse Reflectance in Multi-layered Tissue for High Intensity Laser Therapy

  • Lee, Sangkwan;Youn, Jong-In
    • Journal of the Optical Society of Korea
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    • 제17권2호
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    • pp.205-212
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    • 2013
  • Pain is one of the quite common symptoms in clinics and many treatment methods have been applied to relieve pain. Among the treatments, high-intensity light therapy for pain has been introduced, but this therapy has not been fully supported by confirmed efficacy due to the absence of quantitative assessments and treatment feedback data in real time. In this study, the evaluation of light distribution in tissue was performed with current high-intensity light sources quantitatively using light-tissue interaction simulations. The diffuse reflectance in tissue was generated using Monte Carlo simulation that traces photons as they undergo multiple scattering and absorption within each tissue layer (skin, fat, and muscle) and within multi-layered tissue. The results showed that the highest diffuse reflectance and the deepest penetration of tissue were achieved at ${\lambda}$=830 nm when compared with other wavelengths like ${\lambda}$=650 nm, 980 nm and 1064 nm.

혼성 반사면의 반사 특성 추출 및 형상 복구(II) (Shape recovery and extraction the reflection properties of hybrid reflectance surface(II))

  • 김태은;최종수
    • 전자공학회논문지S
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    • 제34S권6호
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    • pp.21-29
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    • 1997
  • In this paper, we propose a new approach for recovering 3-D shape and extracting the reflectance properties of surface from intensity images. Photometric stereo method(PSM) is genrally based on the direct illumination. In this paper, the reflectance function is derived by interoduceing the indirect diffuse illumination in PSM and then applied to hybrid reflectance model which consists of two components; the lambertian and the specular reflectance. Under the hybrid reflectance model and the indirect diffuse illumination circumstance, the reflectance properties of sample surface can be extracting by normal sampler and then 3-D shape of an object can be recovered based on extracting reflectance properties. This method is rapid because of using the reference table and simplifies the restriction condition about the reflectance function existing in prior studies. Th erecovery efficiency in our method is better than that in prior studies. Also, this method is applied to various types of surfaces by defining general reflectance function.

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미국 중부 토양의 이화학적 특성 추정을 위한 광 확산 반사 신호 전처리 및 캘리브레이션 (Preprocessing and Calibration of Optical Diffuse Reflectance Signal for Estimation of Soil Physical and Chemical Properties in the Central USA)

  • 나우정;;정선옥;김학진
    • Journal of Biosystems Engineering
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    • 제33권6호
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    • pp.430-437
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    • 2008
  • Optical diffuse reflectance sensing in visible and near-infrared wavelength ranges is one approach to rapidly quantify soil properties for site-specific management. The objectives of this study were to investigate effects of preprocessing of reflectance data and determine the accuracy of the reflectance approach for estimating physical and chemical properties of selected Missouri and Illinois, USA surface soils encompassing a wide range of soil types and textures. Diffuse reflectance spectra of air-dried, sieved samples were obtained in the laboratory. Calibrations relating spectra to soil properties determined by standard methods were developed using partial least squares (PLS) regression. The best data preprocessing, consisting of absorbance transformation and mean centering, reduced estimation errors by up to 20% compared to raw reflectance data. Good estimates ($R^2=0.83$ to 0.92) were obtained using spectral data for soil texture fractions, organic matter, and CEC. Estimates of pH, P, and K were not good ($R^2$ < 0.7), and other approaches to estimating these soil chemical properties should be investigated. Overall, the ability of diffuse reflectance spectroscopy to accurately estimate multiple soil properties across a wide range of soils makes it a good candidate technology for providing at least a portion of the data needed in site-specific management of agriculture.

나노스케일 박막의 표면주름 형성을 통한 산란반사도 향상 (Diffuse Reflectance Enhancement through Wrinkling of Nanoscale Thin Films)

  • 김윤영
    • 대한기계학회논문집A
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    • 제39권12호
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    • pp.1245-1249
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    • 2015
  • 본 연구에서는 나노스케일 박막의 표면주름 형성에 의한 산란반사도 향상을 평가하였다. 실리콘 기판 위에 120 nm 두께의 Poly(methyl metacrylate) 층을 스핀코팅(spin-coating)한 후, 20 nm 의 알루미늄 박막을 증착하여 시편을 제작하였다. 이를 오븐에서 $95^{\circ}C$의 온도로 2 시간 동안 풀림처리하여 표면주름을 형성하였다. 분광광도계로 가시광선 영역의 산란반사도를 측정한 결과 400 nm 파장에서 40%의 증가를 보였으며, 표면주름 위에 100 nm 의 은박막을 추가적으로 증착한 경우 산란반사도가 50%까지 향상되는 것을 확인하였다. 본 연구는 산란반사도의 증대를 요구하는 박막형 소자에 표면주름을 활할 수 있음을 제시한다.

물체의 면 반사특성 추정과 측광정합을 이용한 3차원 형상복구 (Estimation of surface reflectance properties and 3D shape recovery using photometric matching)

  • 김태은;류석현;송호근;최종수
    • 한국통신학회논문지
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    • 제21권7호
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    • pp.1633-1641
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    • 1996
  • In this paper we propose a new method for anlayzing the properties of surface reflectance and reconstructing the shape of object using estimated reflectance parameters. We have investigated the hybrid reflectance surface which has specularreflection and diffuse reflection, which can be explained by Torrance-Sparrow model. Sample sphere made on one maerial is used to estimate the reflectance properties by using LMS algorithm. We can make the reference image which consists of surface normal and brightness value using estimated reflectance parameters, and thenarbitrary shape object made of the same material as sample can be reconstructed by matching with reference image. Photometric matching method proposed in this paper is robust because it mateches object image with the reference imageconsidering its neighbor brightness distribution. Also, in this paper plate diffuse illumination is used to remove intensity disparity with simple scheme. It is expected that the proposed algorithm can be applied to 3D recognition, vision inspection system and other fields.

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