• Title/Summary/Keyword: Color Lens

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Luminous efficiency's estimation method of transmitted light in lenses (렌즈에서 투과된 광의 시감도 추정 방법)

  • Kim, Yong-Geun
    • Journal of Korean Ophthalmic Optics Society
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    • v.8 no.2
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    • pp.163-168
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    • 2003
  • The eye sensitivity in the difference conditions of a light source intensity consists of two functions by the receptor of cone and rod according to a wavelength. We derived a distribution function of $P{\lambda}=A{\cdot}e^{-({\lambda}-{\lambda}_u)^2/2W^2}$ using a respond probability of the receptor of cone-rod for a photon. It was well applied for a CIE eye's sensitivity curve of a wavelength. When there is lens In front of eye, luminous efficiency should be corrected. Transmission light which permeate to depends on absorption wavelength, and relationship of final luminous efficiency's estimation method is expressed by multiplication of luminous efficiency and transmittance intensity of lens. $$Pf({\lambda})=T({\lambda}){\cdot}P({\lambda})$$. The theory was applied to photopic and scopic vision with brown color lens.

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Autofocus Tracking System Based on Digital Holographic Microscopy and Electrically Tunable Lens

  • Kim, Ju Wan;Lee, Byeong Ha
    • Current Optics and Photonics
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    • v.3 no.1
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    • pp.27-32
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    • 2019
  • We present an autofocus tracking system implemented by the digital refocusing of digital holographic microscopy (DHM) and the tunability of an electrically tunable lens (ETL). Once the defocusing distance of an image is calculated with the DHM, then the focal plane of the imaging system is optically tuned so that it always gives a well-focused image regardless of the object location. The accuracy of the focus is evaluated by calculating the contrast of refocused images. The DHM is performed in an off-axis holographic configuration, and the ETL performs the focal plane tuning. With this proposed system, we can easily track down the object drifting along the depth direction without using any physical scanning. In addition, the proposed system can simultaneously obtain the digital hologram and the optical image by using the RGB channels of a color camera. In our experiment, the digital hologram is obtained by using the red channel and the optical image is obtained by the blue channel of the same camera at the same time. This technique is expected to find a good application in the long-term imaging of various floating cells.

Elimination of the Red-Eye Area using Skin Color Information

  • Kim, Kwang-Baek;Song, Doo-Heon
    • Journal of information and communication convergence engineering
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    • v.7 no.2
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    • pp.131-134
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    • 2009
  • The red-eye effect in photography occurs when using a photographic flash very close to the camera lens, in ambient low light due to in experience. Once occurred, the photographer needs to remove it with image tool that requires time consuming, skillful process. In this paper, we propose a new method to extract and remove such red-eye area automatically. Our method starts with transforming ROB space to YCbCr and HSI space and it extracts the face area by using skin color information. The target red-eye area is then extracted by applying 8-direction contour tracking algorithm and removed. The experiment shows our method's effectiveness.

A Study on the Design Guide of Fee Charging Residential Facility for the Elderly reflected in Color Perception Characteristic (노인의 색지각적 특성을 고려한 유료 노인주거 실내공간의 설계지침에 관한 연구)

  • Song, Choon-Eui;Kim, Moon-Duck
    • Archives of design research
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    • v.20 no.3 s.71
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    • pp.247-256
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    • 2007
  • Aging brings color-weakness to the eye due to yellowed eye sight. The 87% of information required for human behavioral decisions are visually perceived. Therefore, the color-weakness will affect behavior in many ways. Most of previous research regarding color planning for the aged focuses on discovering their preferred colors and reflecting the colors on facility color planning. But such research failed to identify the confused range of color cognitions due to the color weakness of the aged. The purpose of this study is to propose a design guide for fee-charging residential facilities for the elderly, reflecting upon color perception characteristics. An experimental simulation on aged vision using the UV filter and Y-2 filter, YA-3 filter alternating for general eyesight, 70 year-old and late 80 year-old was conducted. The results of this study are as follow : color perception is changed by crystalline lens aging process and yellowed eye sight. The recognition arrangement of colors was preferred to contrast harmony rather than similarity harmony and the dominant color is a warm color rather than a cool color.

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Defect Detection of ‘Fuji’ Apple using NIR Imaging(I) -Optical characteristics of defects and selection of significant wavelelength- (근적외선 영상을 이용한 후지사과의 결점 검출에 관한 연구 (I) -결점의 광학적 특성 구명 및 유의파장 선정-)

  • 이수희;노상하
    • Journal of Biosystems Engineering
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    • v.26 no.2
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    • pp.169-176
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    • 2001
  • Defect of apple was depreciated the product value and causes storage disease seriously. To detect the defect of ‘Fuji’apple with machine vision system, the optical characteristics of defect should be investigated. In this research, absorbance spectra of defect were acquired by spectrophotometer in the range of visible and NIR region(400∼1,100nm) and L*a*b* color values were also acquired by colorimeter. NIR machine vision system was constructed with B&W camera, frame grabber, 16 tungsten-halogen lamps, variable focal length lens and NIR bandpass filter which was mounted to lens outward. Average gray values of defect at 15 NIR wavelength were acquired and the significant NIR wavelength was selected by comparing Mahalanobis distance between sound and defective apple. As the result of Mahalanobis distance analysis, the significant wavelength to discriminate the defectives in ‘Fuji’apple were found to be 720nm for scab and 970nm for bruise and cuts and 920nm was also effective regardless of defective types.

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CMM(Compact Camera Module) Defect Inspection (CMM(Compact Camera Module) 불량 검사)

  • 고국원;이유진;최병욱;고경철
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.585-589
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    • 2004
  • This paper deals with the algorithm development that inspects defects such as Lens Focus, Black Defect, Dim Defect, Color Defect, White Balance, and Line Defect caused by the process of Compact Camera Module (CCM). These days the demand of CCM goes on increasing in various types like PDA, a cellular phone and PC camera every year. However, owing to the defect inspection of CCM by the semiskilled work the average inspection time of CCM takes about 40 to 50 seconds. As time goes by the efficiency takes a sudden turn for the worse because workers must inspect with seeing a monitor directly. In this paper, to solve these problems, we developed the imaging processing algorithm to inspect the defects in captured image of assembled CCM. The performances of the developed inspection system and its algorithm are tested on many samples. Experimental results reveal that the proposed system can focus the lens of CCM within 5s and we can recognize various types of defect of CCM modules with good accuracy and high speed.

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The Study of Micro Fabrication using Picosecond Laser Ablation (피코초 레이저 어블레이션을 이용한 미세 가공 연구)

  • Noh, Ji-Whan;Sohn, Hyon-Kee;Suh, Jeong;Lee, Jae-Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.2
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    • pp.25-28
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    • 2010
  • The micro fabrication on the mold material using picosecond laser ablation processing has been studied. We used the two kind of system with picosecond laser. First one is two mirror type scanner and telecentric f-theta lens. Second one is X-Y stage and objective lens. By using these system, the $100{\mu}m$ size chess patterning and $2{\mu}m$ size patterning was fabricated. Especially $2{\mu}m$ size patterning on the mold material can be used as the decorative rainbow color logo for industrial field. In this paper, it is proved the picosecond laser is effective tool for the laser ablation processing.

Study of the coloration factors of tinted lenses (착색렌즈의 색비율 정량화에 관한 연구)

  • Lim, Yong-Mu;Shim, Moon-Sik;Jung, Ju-Hyun
    • Journal of Korean Ophthalmic Optics Society
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    • v.6 no.2
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    • pp.37-46
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    • 2001
  • In this study, We compared the properties of tinted and colored lenses with the standards m the ordinary optical properties, coloration, UV, IR and luminous transmittance, color acceptance for traffic signal, and chromaticity. The UV, lR and luminous transmittance was analysed in the range of 175 nm to 3000 nm by using a UV-Vis-IR spectrophotometer and was used in the synthesis of spectrum of various color lens. A experimental function was made from the slope obtained from the transmittance change as a function of coloration time. We could expect the ordinary optical properties and color acceptance for traffic signal of various color lenses with the requirements of US standard(ANSI Z-80.3).

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Computer Simulation for Gradual Yellowing of Aged Lens and Its Application for Test Devices

  • Kim, Bog G.;Han, Jeong-Won;Park, Soo-Been
    • Journal of the Optical Society of Korea
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    • v.17 no.4
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    • pp.344-349
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    • 2013
  • This paper proposes a simulation algorithm to assess the gradual yellowing vision of the elderly, which refers to the predominance of yellowness in their vision due to aging of the ocular optic media. This algorithm employed the spectral transmittance property of a yellow filter to represent the color appearance perceived by elderly people with yellow vision, and modeled the changes in the color space through a spectrum change in light using the yellow filter effect. The spectral reflectivity data of 1269 Munsell matte color chips were used as reference data. Under the standard conditions of a D65 illuminant and a $10^{\circ}$ observer of 1964 CIE, the spectrum of the 1269 Munsell colors were processed through the yellow filter effect to simulate yellow vision. Various degrees of yellow vision were modeled according to the transmittance percentage of the yellow filter. The color differences before and after the yellow filter effect were calculated using the DE2000 formula, and the color pairs were selected based on the color difference function. These color pairs are distinguishable through normal vision, but the color difference diminishes as the degree of yellow vision increases. Assuming 80% of yellow vision effect, 17 color pairs out of $(1269{\times}1268)/2$ pairs were selected, and for the 90% of yellow vision effect, only 3 color pairs were selected. The result of this study can be utilized for the diagnosis system of gradual yellow vision, making various types of test charts with selected color pairs.

Convergence study of blue light transmittance comparison between tips for light curing machine and commercially available blue light blocking lenses and yellow tinted lenses (광중합기용 팁과 시판용 청광 차단 렌즈 및 노란색 착색 렌즈의 청광 투과율 비교 융합 연구)

  • Lee, Sook-Jeong
    • Journal of the Korea Convergence Society
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    • v.12 no.7
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    • pp.125-131
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    • 2021
  • Blue light with strong energy is required for light-curing resin treatment, which is being used more frequently in dentistry. To reduce the risk of exposure to scattered light, we tried to use colored lenses. The tips for light curing machine and a commercially available yellow-type blue-light blocking lens and a yellow lens colored with yellow dye, which are expected to be effective in blocking blue light, were placed in a UV-Vis spectrometer device, and transmission and blocking of blue light were tested respectively. As a result, the average blue light blocking rate of the light curing machine tips was 99.49%, and the C lens with the highest color density among commercially available lenses showed a high blue light blocking rate of 99.54%. In the case of lenses tinted with yellow, the yellow tinted C lens with the highest tint concentration showed 87.57% of blue light blocking rate. It is judged that the side effects related to the eyes caused by blue light can be reduced if a yellow-type commercially available or colored lens is worn along with a light curing machine tip during resin treatment.