• Title/Summary/Keyword: Color Diagram

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UBV CCD PHOTOMETRY OF THE INTERMEDIATE AGE OPEN CLUSTER NGC 6716

  • CHUN MOO-YOUNG;LEE SEE-WOO
    • Journal of The Korean Astronomical Society
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    • v.29 no.2
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    • pp.137-156
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    • 1996
  • NGC 6716 is an intermediate-age open cluster in Sagittarius. In this paper, we present the new UBV CCD photometry of the stars in the cluster, which is deeper than previous ones. From the color-color diagram and the color-magnitude diagram, we derived a reddening $E_{B- V} = 0.17\pm0.03$ and a distance modulus of the cluster, $(V - Mv)_o = 9.2\pm0.1$. An age of the cluster is estimated as $8\pm10^7 yrs$ from the latest isochrone. Luminosity function and mass function of the cluster are derived. The gradient of the mass function of bright stars is a bit steep, $\Gamma = -1.85\pm0.05$, and there is no distinct bump and dip in the mass function.

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Selection of Apple Ground Color for Maturity Index Using Color Machine Vision (컬러 컴퓨터 시각에 의한 사과 선별 기준색깔 선정)

  • 서상룡;성제훈
    • Journal of Biosystems Engineering
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    • v.22 no.2
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    • pp.210-216
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    • 1997
  • A study to select ground colors of Fuji apple for maturity index which are needed to standardize grading of the apples is presented. Two extreme colors of immature and fully mature Fuji and Zonagold apples produced in Korea were determined. Various ground colors of Fuji apple between the two extreme colors were collected and classified by human vision and colors of Fuji apple for maturity index were selected from the classification. Coordinates of the selected colors in xy chromaticity diagram were determined by spectrophotometers to define them in a standard coordinate system. Coordinates of the colors in r-g chromaticity diagram using a color machine vision system were also determined to use the colors in apple grading by the machine vision system. Grading Fuji apples using the machine vision system was performed and result of the grading was compared with Ending results of human vision and colorimeter. The comparison was performed with the same Fuji apple samples and showed 65% md 75% of same grades, respectively, as the grades determined by the machine vision system. Differences of fading performance between the compared three grading methods were explained as mainly because of the differences of observation area of the grading methods.

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A Y-BAND LOOK OF THE SKY WITH 1-M CLASS TELESCOPES

  • Choi, Chang-Su;Im, Myung-Shin;Jeon, Yi-Seul;Ibrahimov, Mansur
    • Journal of The Korean Astronomical Society
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    • v.45 no.1
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    • pp.7-17
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    • 2012
  • Y-band is a broad passband that is centered at ~1 ${\mu}m$. It is becoming a new, popular window for extragalactic study especially for observations of red objects thanks to recent CCD technology developments. In order to better understand the general characteristics of objects in Y-band, and to investigate the promise of Y-band observations with small telescopes, we carried out imaging observations of several extragalactic fields, brown dwarfs, and high redshift quasars with Y-band filter at the Mt. Lemmon Optical Astronomy Observatory and the Maidanak observatory. From our observations, we constrain the bright end of the galaxy and the stellar number counts in Y-band. We also test the usefulness of high redshift quasar (z >6) selection via i - z - Y color-color diagram, to demonstrate that the i - z - Y color-color diagram is effective for the selection of high redshift quasars even with a conventional optical CCD camera installed at a 1-m class telescope.

HST Pixel Analysis of NGC 5195

  • Lee, Joon-Hyeop;Kim, Sang-Chul;Ree, Chang-Hee;Kyeong, Jae-Mann;Sung, Eon-Chang;Chung, Ji-Won
    • The Bulletin of The Korean Astronomical Society
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    • v.36 no.1
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    • pp.59.1-59.1
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    • 2011
  • We report the HST pixel analysis results of the interacting S0 galaxy, NGC 5195 (M51B), using the HST/ACS images in the F435W, F555W and F814W (BVI) bands. After 4x4 binning of the HST/ACS images to secure sufficient signal-to-noise ratio for each pixel, we derive several quantities describing the pixel color-magnitude diagram (pCMD) of NGC 5195, such as blue/red color cut, red pixel sequence parameters, blue pixel sequence parameters and blue-to-red pixel ratio. Those parameters reflect the internal properties of NGC 5195 like age, metallicity, dust content and galaxy morphology. To investigate the spatial distributions of stellar populations, we divide pixel stellar populations using the pixel color-color diagram and population synthesis models. As a result, we find that the tidal interaction with NGC 5194 significantly affects the stellar populations in their dust content and mean stellar age.

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Detection of Color Information Using Optical Method (광학적 방법을 이용한 색 정보 검출)

  • Kim, Ji-Sun;Jung, Gu-In;Lee, Tae-Hee;Choi, Ju-Hyeon;Oh, Han-Byeol;Kim, A-Hee;Jung, Hyon-Chel;Jun, Jae-Hoon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.1
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    • pp.159-164
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    • 2015
  • Color is distinguished due to the light in which natural light is reflected by object and made with combination of RGB(red, green, blue; three colors). This study proposes color analysis system with optical method to be used conveniently. Color information of sample is determined with the optical sensor. By using the CIE diagram in particular, it detects purity value and wavelength. The method to distinguish color is very economical, simple, and convenient. The result can be used to confirm accurate information of color for various applications.

Estimation of chlorophyll and pheophytin contents of rice (Oryza sativa L.) leaf in seedling bed using CIE chromaticity diagram

  • Kim, Tae Sung;Ham, Hyun Don;Lee, Mi Hyun;Park, Ki Bae;Yoo, Sung Yung;Kim, Tae Wan
    • Proceedings of the Korean Society of Crop Science Conference
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    • 2017.06a
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    • pp.243-243
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    • 2017
  • Leaf colors of rice can be used to identify stress level due to its adaptation to environmental change. For most leaves green-related colors are sourced from chlorophyll a and b. For most leaves green-related colors are consisted of chlorophyll a and b. Chlorophyll concentration is normally measured using a spectrophotometer in laboratory. In some remote observation fields, it is impossible to collect the leaves, preserve them, and bring them to laboratory to measure their chlorophyll content. The measurement of chlorophyll content is observed through its color. Using CIE chromaticity diagram leaf color information in RGB is transformed into wavelength (in nm). Pheophytin contents were also analyzed in 95% ethanol extracts. In the process of leaf development of rice young seedling, both pigments were compared. Leaf samples from different rice seedling bed is taken, their colors and RGB values are recorded using Photoshop Image Analysis. SPAD-502 values were also measured. The chlorophyll and Pheophytin contents were fully estimated by ${\rightthreetimes}_{avg}$ on CIE chromaticity diagram.

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INFRARED PHOTOMETRIC STUDY OF FIELD POPULATION II STARS

  • LEE SANG-GAK;BRUCE W. CARNEY;ROBERT PROBST
    • Journal of The Korean Astronomical Society
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    • v.30 no.1
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    • pp.1-11
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    • 1997
  • Near infrared JHK magnitudes are presented for two hundred two high proper motion stars. We have observed high proper motion stars in the near-infrared bands(JHK) using the COB detector on the Kitt Peak 1.3m, 2.1m and 4m telescopes. The observations and data reduction procedures are described. The infrared color magnitude diagram and color-color diagrams for the program stars are presented.

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The color characteristics of preferred clothing textiles of college students in spring and fall - A comparison of clothing textiles for top and bottom - (대학생의 춘추용 의복품목별 선호소재의 색 특성 연구 - 상의와 하의용 의복소재의 비교 -)

  • Kim, Hee-Sook
    • Journal of the Korean Home Economics Association
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    • v.44 no.10
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    • pp.47-55
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    • 2006
  • The purpose of this study was to analyze and compare the color characteristics of preferred clothing textiles of college students. One hundred nine male and female college students were evaluated for their preference to clothing textiles in previous research. To analyze the color characteristics, spectral data were measured. Color, color tone, and values of $L^*,\;a^*,\;b^*$ according to clothing item were compared. In addition, chromaticity diagram was drawn. The results of this study were as following. 1. The color of the shirts textile that college student preferred most in spring/fall was PB(purple blue) color, lt(light) tone. In general, the preferred textiles for shirts represented a simple color that is close to achromatic color with light and soft shade. The color of the blouse textiles that college student preferred most was PB color, d(dull), g(grayish) and W(white) tone. 2. The most frequently shown color of upper garment was PB, followed by Y(yellow) for shirt and R(red) for blouses. College students prefer a simple color which is close to achromatic color, and a light and soft color was preferred for shirts fabric and they preferred various, medium shades, but closer to pure colors for blouses because college students tend to consider that the aesthetic side is important and usually wear blouses less often than shirts. 3. For slacks, the colors of the preferred textiles were B(blue), PB color and lt.g.(light grayish), g, d and bk(black) tone. Therefore, the preferred textiles for slacks represented simple colors such as bluish or close to achromatic color with light or dark shade. For skirt, YR(yellow red), PB color and lt.g, lt, d. tone were preferred. Therefore, soft light or moderately toned various colors that are close to pure color were especially preferred for skirts. 4. The colors of preferred fabrics for slacks and skirts differed. The colors of the preferred fabrics for slacks were mostly cold color, whereas those of skirts were mostly warm color. And college students preferred various, medium shaded and closer to pure colors for skirts because they tend to consider the aesthetic side as being important. 5. The pattern of preferred fabrics was mostly solid, regardless of clothing item, and melange was the second most preferred pattern. 6. Through the analysis of $L^*,\;a^*,\;b^*$ values, shirt and blouse textiles showed higher $L^*$ value than that of slacks and skirt. The preferred textiles of college students were generally close to achromatic color because the values of $a^*$, and $b^*$ were very low, as confirmed by the result of the chromaticity diagram.

INFRARED AND HARD X-RAY DIAGNOSTICS OF AGN IDENTIFICATION FROM THE AKARI AND SWIFT/BAT ALL-SKY SURVEYS

  • Matsuta, K.;Gandhi, P.;Dotani, T.;Nakagawa, T.;Isobe, N.;Ueda, Y.;Ichikawa, K.;Terashima, Y.;Oyabu, S.;Yamamura, I.;Stawarz, L.
    • Publications of The Korean Astronomical Society
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    • v.27 no.4
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    • pp.285-286
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    • 2012
  • We combine data from two all-sky surveys, the Swift/Burst Alert Telescope 22 Month Source Catalog and the AKARI Point Source Catalogue, in order to study the connection between the hard X-ray (> 10 keV) and infrared (IR) properties of local active galactic nuclei (AGN). We find two photometric diagnostics are useful for source classification: one is the X-ray luminosity vs. IR color diagram, in which type 1 radio-loud AGN are well isolated from other AGN. The second one uses the X-ray vs. IR color-color diagram as a redshift-independent indicator for identifying Compton-thick (CT) AGN. Importantly, CT AGN and starburst galaxies in composite systems can also be separated in this plane based upon their hard X-ray fluxes and dust temperatures. This diagram may be useful as a new indicator to classify objects in new surveys such as with WISE and NuSTAR.