• 제목/요약/키워드: Color enhancement

검색결과 379건 처리시간 0.021초

화학시약들을 이용한 지류에서 혈흔지문 증강에 관한 연구 (The study of bloody fingerprint enhancement on paper with chemical reagents)

  • 임승;김임순;노종윤;김상일;유제설
    • 분석과학
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    • 제25권5호
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    • pp.284-291
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    • 2012
  • 혈흔지문은 매우 중요한 증거물이다. 본 실험은 지류에 유류된 혈흔지문에 대해 화학시약인 닌히드린, leucocrystal violet (LCV), fuchsin acid, 요오드, dimethylaminocinnam aldehyde (DMAC) 시약들의 증강효과를 확인한 것이다. 혈흔지문은 종이에 순차적으로 유류시킨 후 실온에서 건조해 사용하였다. 혈흔지문 융선이 비교적 선명할 경우에는 닌히드린과 LCV 시약이 가장 효과적이었지만, 눈에 보이지 않는 융선에 대한 증강효과는 크지 않았다. Fuchsin acid 시약을 사용하면 종이 표면이 염색되므로 혈흔지문의 contrast는 오히려 감소했다. 요오드 시약으로 혈흔지문 융선이 증강되긴 했지만, 반응 후 발색이 약하고 증강효과도 크지 않았다. DMAC 시약은 선명한 혈흔지문에 대한 증강효과가 좋지 않았지만, 희미한 융선에 대한 증강에는 매우 효과적이었다. 메탄올로 세척함으로서 DMAC로 증강된 혈흔지문의 contrast를 높일 수 있었다.

시각 감지 기반의 저조도 영상 이미지 적응 보상 증진 알고리즘 (Adaptive Enhancement of Low-light Video Images Algorithm Based on Visual Perception)

  • 이원;민병원
    • 사물인터넷융복합논문지
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    • 제10권2호
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    • pp.51-60
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    • 2024
  • 저조도 환경에서 영상 이미지의 콘트라스트가 낮고 식별이 어려운 문제를 목표로 사람의 시각 감지 기반의 콘트라스트 적응 보상 증진 알고리즘을 제안한다. 첫째, 저조도 환경에서 평균 밝기, 평균 대역폭 요인의 영상 이미지 특징 요인을 추출하고, 원본 영상의 회색/색도 차이에 따라 사람의 시각적 콘트라스트 해상도 보상의 수학적 모델을 설정하며, 실제 컬러의 3원색에 대해 각각 비례 적분하여 보상한다. 다음으로 보상 정도가 명시각 차이를 적절하게 구별할 수 있는 것보다 낮을 때 보상 임계값 선형 보상이 명시각에서 전체 대역폭으로 설정된다. 마지막으로 주관적인 이미지 품질 평가와 이미지 특성 요인을 결합하여 비례 계수를 보상하는 자동 최적화 모델을 구축한다. 실험 테스트 결과는 영상 이미지 적응 증진 알고리즘이 우수한 증진 효과와 우수한 실시간 성능을 가지며 다크 비전 정보를 효과적으로 마이닝할 수 있으며 다양한 시나리오에서 널리 사용될 수 있음을 보여준다.

Simple Model of Bright-room Contrast Ratio Measurement System for Plasma Display Panels with Contrast Enhancement Film

  • Beom, Tae-Won;Park, Gi-Chan;Park, Jong-Rak;Kim, Young-Sik;Zhang, Jun;Song, Bu-Seup;Chun, Jong-Pil;Yoon, Ki-Cheol;Jang, Won-Gun
    • Journal of the Optical Society of Korea
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    • 제15권1호
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    • pp.38-43
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    • 2011
  • We have developed a simple model of a bright-room contrast ratio (BRCR) measurement system for plasma display panels (PDPs) adopting a contrast enhancement film (CEF) by using an illumination design tool. Only four model parameters were used, namely, total ambient illumination power delivered by fluorescent lamps, a panel scattering rate, illuminance of PDP white patterns, and the absorption coefficient of a color adjusting film. These parameters were determined by simple optical measurements and matching simulations. The proposed model was employed to predict the BRCR values of four different CEF samples, and the simulated ones were found to be in agreement with measured ones within about 10% relative-error.

대형 2차 와류에 의한 봉다발 부수로에서의 난류 열전달 향상에 관한 실험적 연구 (Experiment of Turbulent Heat Transfer Performance Enhancement in Rod Bundle Subchannel by the Large Scale Vortex Flow)

  • 서귀현;최영돈
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 추계학술대회
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    • pp.1592-1597
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    • 2004
  • Experimental studies were carried out to confirm the turbulent enhancement of the cooling system of nuclear reactor by large scale vortex generation in nuclear fuel rod bundle. The large scale vortex motions were generated by rearranging the inclination angles of mixing vanes to the coordinate directions. Experimental studies were carried out at Reynolds Number 60,000 with hydraulic condition. Normal variations of mean velocity and turbulent intensity in the rod bundle subchannel were measured by the 2-color LDV measurement system. The turbulence generated by split mixing vanes has small length scales so that they maintain only about 10DH after the spacer grid. On the other hand, the turbulences generated by the large scale vortex continue more and remain up $25D_{H}$ after the spacer grid.

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이량체액정의 상전이에 의한 Conformation Entropy 변화 (Conformation Entropy Changes of Dimer Liquid Crystals on the Crystal-Nematic and Nematic-Isotropic Transitions)

  • 남수용
    • 한국인쇄학회지
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    • 제14권1호
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    • pp.75-88
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    • 1996
  • Digital image capturing technology has been making great progress recently, and we can now simply capture the color image by digital camera, flat-bed scanner of Photo CD system. A lot of professionals are instrested in the capability of Photo CD and other digital images in the printing and publishing industry. But these images were not processed a suitable image processing to use in the hard copy. In this paper we described a method of the digital enhancement processiing to use in the printing and publishing industry. Experimental result show that the described method was useful and valid for the digital image enhancement to use in the hard copy.

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Enhancement of Turbulent Heat Transfer of the Cooling System in Nuclear Reactor by Large Scale Vortex Generation

  • Chun, Kun-Ho;Park, Jong-Seok;Choi, Young-Don
    • International Journal of Air-Conditioning and Refrigeration
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    • 제9권2호
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    • pp.77-84
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    • 2001
  • Experimental and computational studies were carried out to investigate the turbulent heat transfer enhancement of the cooling system in nuclear reactor by large scale vortex generation. The large scale vortex motion was generated by rearranging the inclination angels of mixing vanes to the coordinate direction. Axial development of mean and turbulent velocities in the subchannels were measured by the 2-color LDV system. Eddy diffusivity concept based on $\kappa{-}\varepsilon$ model was employed to calculate the turbulent heat and momentum transfers in the subchannel. The turbulences generated by split mixing vanes has small length scales so that they maintain only about $10D_H$ after the spacer grid. On the other hand, the turbulences generated by the large scale vortex motions continue longer and remain up to $25D_H$ after the spacer grid.

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원자로 연료봉내 대형 와유동에 의한 원자로 냉각제 시스템의 난류 증진 (Turbulent Enhancement of the Cooling System of Nuclear Reactor by Large Scale Vortex Generation in a Nuclear Fuel Bundles)

  • 전건호;박종석;최영돈
    • 설비공학논문집
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    • 제12권11호
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    • pp.1004-1011
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    • 2000
  • Experimental and computational studies were carried out to confirm the turbulent enhancement of the cooling system of nuclear reactor by large scale vortex generation in nuclear fuel bundle. The large scale vortex motions were generated by rearranging the inclination angles of mixing vanes to the coordinate directions. Axial development of mean and turbulent velocities in the subchannels were measured by the 2-color LDV system. Eddy diffusivity heat flux model and $k-varepsilon$ model were employed to analyze the turbulent heat and fluid flows in the subchannel. The turbulence generated by split mixing vanes has small length scales so that they maintain only about $10 D_H$ after the spacer grid. On the other hand, the turbulences generated by the large scale vortex continue more and remain up to $25 D_H$after the spacer gird.

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Discriminatory Projection of Camouflaged Texture Through Line Masks

  • Bhajantri, Nagappa;Pradeep, Kumar R.;Nagabhushan, P.
    • Journal of Information Processing Systems
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    • 제9권4호
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    • pp.660-677
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    • 2013
  • The blending of defective texture with the ambience texture results in camouflage. The gray value or color distribution pattern of the camouflaged images fails to reflect considerable deviations between the camouflaged object and the sublimating background demands improved strategies for texture analysis. In this research, we propose the implementation of an initial enhancement of the image that employs line masks, which could result in a better discrimination of the camouflaged portion. Finally, the gray value distribution patterns are analyzed in the enhanced image, to fix the camouflaged portions.

한국 산업 제품의 색채 연구 - 1960-70년대 산업화 시기를 중심으로 - (A Study on Colorization of Industrial Products of Korean Make - Focused on the reflection of the Panorama exhibited during the perior of the sixties and seventies of the Previous Century -)

  • 이옥분
    • 디자인학연구
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    • 제18권4호
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    • pp.215-224
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    • 2005
  • 최근 장식에 대한 관심이 증가하면서 제품의 외관을 다루는 작업의 중요성이 강조되고 있다 이는 색채 디자인 활동의 전문성으로 이어지고 있으며 이러 찬 상황에서 색채 디자인에 대한 개념의 재정립과 방향성의 제고는 불가피하다고 하겠다. 이와 같은 맥락에서 우리나라 색채 디자인의 출발점인 1960-70년대의 색채를 살펴봄으로써 색채 디자인의 적극적 도입 과정과 그 매커니즘에 대한 이해에 도움이 되고자 한다. 본 연구를 위해 60-70년대의 산업 재효의 색채에 관한 문헌을 조사 분석하여 색채의 특징을 구분하고 각각의 색채에 대한 배경과 의미를 고찰하였다. 연구 결과, 우리나라의 제품 색채는 산업화 속에서 제품의 기능적, 시각적인 마무리를 위한 개념에서 설정된 생산과 판매중심의 접근임을 알 수 있었다. 색채는 경제 성장을 향하는 물질가치 중심의 산업화의 이념과 제품에 대한 인식틀 속에서 그 방향성이 결정되었고 따라서 단순한 모방이나 기능적 보완, 또는 시각적인 주목성과 차별화기 기능 역할을 부여 받았다. 이러한 인식은 가전 제품을 중심으로 하는 백색, 소규모 일상용품을 중심으로 하는 순색, 가구와 같은 장식 개념의 제품을 중심으로 하는 자연 소재색의 3영역으로 나타났다. 이와 같은 연구는 제품 색채에 대한 연구가 미흡했던 점, 특히 제품 디자인에 대한 연구가 외형적 특성에만 집중하는 기존의 연구 태도로 인해 중요성의 인식이 부족하였던 색채에 대한 고찰이라는 면에서 의의를 갖는다.

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치아회분과 석고혼합제제 매식후 Digital Subtraction Radiography에 의한 골량 변화의 평가 (Evaluation of Bone Change by Digital Subtraction Radiography after Implantation of Tooth Ash-plaster Mixture)

  • 김재덕;김광원;조영곤;김동기;최의환
    • 치과방사선
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    • 제29권2호
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    • pp.423-433
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    • 1999
  • Purpose : To assess the methods for the clinical evaluation of the longitudinal bone changes after implantation of tooth ash-plaster mixture into the defect area of human jaws. Materials and methods : Tooth ash-plaster mixtures were implanted into the defects of 8 human jaws. 48 intraoral radiograms taken with copper step wedge as reference at soon, 1st, 2nd, 4th, and 6th week after implantation of mixture were used. X-ray taking was standardized by using Rinn XCP device customized directly to the individual dentition with resin bite block. The images inputted by Quick scanner were digitized and analyzed by NIH image program. Cu­equivalent values were measured at the implanted sites from the periodic digital images. Analysis was performed by the bidirectional subtraction with color enhancement and the surface plot of resliced contiguous image. The obtained results by the two methods were compared with Cu­equivalent value changes. Results : The average determination coefficient of Cu-equivalent equations was 0.9988 and the coefficient of variation of measured Cu values ranged from 0.08~0.10. The coefficient of variation of Cu-equivalent values measured at the areas of the mixture and the bone by the conversion equation ranged from 0.06 ~0.09. The analyzed results by the bidirectional subtraction with color enhancement were coincident with the changes of Cu-equivalent values. The surface plot of the resliced contiguous image showed the three dimensional view of the longitudinal bone changes on one image and also coincident with Cu-equivalent value changes after implantation. Conclusion : The bidirectional subtraction with color enhancement and the surface plot of the resliced contiguous image was very effective and reasonable to analyze clinically and qualitatively the longitudinal bone change. These methods are expected to be applicable to the non-destructive test in other fields.

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