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검색결과 466건 처리시간 0.026초

영상의 컬러 정보를 이용한 계층적 스테레오 정합 (Hierarchical Stereo Matching with Color Information)

  • 김태준;유지상
    • 한국통신학회논문지
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    • 제34권3C호
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    • pp.279-287
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    • 2009
  • 본 논문에서는 컬러 정보를 이용한 계층적 스테레오 정합 기법을 제안한다. 특징기반의 스테레오 정합 방법을 이용하여 초기 변이지도를 생성하고, 계층적 스테레오 정합 기법으로 최종 변이지도를 획득한다. 영상을 R, G, B, white 4개의 색상 성분으로 분할하여 영상의 경계(edge)를 추출하고, 추출된 경계에서 정합 창을 이용하여 변이(disparity)를 추정한다. 추정된 변이는 각 색상 성분에서 자기상관도(autocorrelation)에 따라 주변 영역으로 확산되어 초기 변이지도(disparity map)를 생성한다. 초기 변이지도는 최종 변이지도를 생성하기 위한 변이 탐색의 초기값으로 사용되고, 각 색상 성분에서 정합 창과 탐색 범위(search range)의 변화를 이용하여 최종 변이 지도를 생성시킨다. 본 논문에서는 Middlebury stereo vision의 4개의 실험 영상을 가지고 객관적 성능 평가를 하였다. 실험 결과 제안한 기법이 기존의 Graph-cuts와 Dynamic Programming 기법보다 우수한 성능을 보였다. 최종 변이지도의 부정확한 변이는 전체 영상에서 평균11% 존재했고, 변이지도에서 불연속점의 경계가 뚜렷한 것을 확인하였다.

Comparison of canal transportation in simulated curved canals prepared with ProTaper Universal and ProTaper Gold systems

  • Silva, Emmanuel Joao Nogueira Leal;Muniz, Brenda Leite;Pires, Frederico;Belladonna, Felipe Goncalves;Neves, Aline Almeida;Souza, Erick Miranda;De-Deus, Gustavo
    • Restorative Dentistry and Endodontics
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    • 제41권1호
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    • pp.1-5
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    • 2016
  • Objectives: The purpose of this study was to assess the ability of ProTaper Gold (PTG, Dentsply Maillefer) in maintaining the original profile of root canal anatomy. For that, ProTaper Universal (PTU, Dentsply Maillefer) was used as reference techniques for comparison. Materials and Methods: Twenty simulated curved canals manufactured in clear resin blocks were randomly assigned to 2 groups (n = 10) according to the system used for canal instrumentation: PTU and PTG groups, upto F2 files (25/0.08). Color stereomicroscopic images from each block were taken exactly at the same position before and after instrumentation. All image processing and data analysis were performed with an open source program (FIJI). Evaluation of canal transportation was obtained for two independent canal regions: straight and curved levels. Student's t test was used with a cut-off for significance set at ${\alpha}=5%$. Results: Instrumentation systems significantly influenced canal transportation (p < 0.0001). A significant interaction between instrumentation system and root canal level (p < 0.0001) was found. PTU and PTG systems produced similar canal transportation at the straight part, while PTG system resulted in lower canal transportation than PTU system at the curved part. Canal transportation was higher at the curved canal portion (p < 0.0001). Conclusions: PTG system produced overall less canal transportation in the curved portion when compared to PTU system.

패션 디자인 분석 시스템(Web-SFAS) 활용 국내 여성 스트리트 패션 조사 분석 -2005년 S/S를 중심으로- (A Study on Application of Web-based Fashion Information Analysis System for Korea Women's Street Fashion 2005 S/S)

  • 박혜원
    • 한국의류학회지
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    • 제30권8호
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    • pp.1275-1287
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    • 2006
  • This was to confirm the Web-SFAS and street Fashion trend 2005. Korea women's street fashion in 2005 S/S was analyzed by using the Web-SFAS(Street Fashion Analysis System) that was developed and completed in the earlier research. Total 270 women who were sensitive to the fashion were surveyed around in 5 nationwide cities and 9 commercial zones. The analysis results of the questionnaire and image survey in 2005 S/S for each commercial zone is shown as follows: 1. The sequence of care with most interest in producing fashionable shape is in the order of clothes>accessory>hair style>make up>shoes, and it was found that the proper reason for visiting the commercial zone is to meet with friends than shopping. 2. Most preferred item for tops were shirts and T-shirts, while for bottoms were blue jeans of denim material in various colors and designs. The color had the clear winner in white color with the pink or yellow line of colors preferred in all commercial zones. The blue jeans and skirt items were the most dominant with the preference on the blue color. The color and image were diversely favored with light, natural, modern, elegance and warm images. 3. The semi-formal image was preferred in women's street fashion, 2005 S/S in Apgujeong-dong, Hapseong-dong, Myeong-dong, Hongik University area, Dongseong-ro, and the active comfort casual image was preferred by womens in Seo-myeon, Nampo-dong and Sangnam-dong. However the retro image were represented in Daehak-ro specially. The tendency of street fashion for women had the difference of their own trends for each commercial zone, rather then the regional differences for each city with the conspicuous preference of color for the items.

Tumoral Accumulation of Long-Circulating, Self-Assembled Nanoparticles and Its Visualization by Gamma Scintigraphy

  • Cho, Yong-Woo;Kim, Yoo-Shin;Kim, In-San;Park, Rang-Woon;Oh, Seung-Jun;Moon, Dae-Hyuk;Kim, Sang-Yoon;Kwon, Ick-Chan
    • Macromolecular Research
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    • 제16권1호
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    • pp.15-20
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    • 2008
  • The enhanced permeability and retention (EPR) effect is used extensively for the passive targeting of many macromolecular drugs for tumors. Indeed, the EPR concept has been a gold standard in polymeric anticancer drug delivery systems. This study investigated the tumoral distribution of self-assembled nanoparticles based on the EPR effect using fluorescein and radio-labeled nanoparticles. Self-assembled nanoparticles were prepared from amphiphilic chitosan derivatives, and their tissue distribution was examined in tumor-bearing mice. The size of the nanoparticles was controlled to be 330 run, which is a size suited for opening between the defective endothelial cells in tumors. The long-circulating polymer nanoparticles were allowed to gradually accumulate in the tumors for 11 days. The amount of nanoparticles accumulated in the tumors was remarkably augmented from 3.4%ID/g tissue at 1 day to 25.9%ID/g tissue at 11 days after i.v. administration. The self-assembled nanoparticles were sustained at a high level throughout the 14 day experimental period, indicating their long systemic retention in the blood circulation. The ${\gamma}$-images provided clear evidence of selective tumor localization of the $^{131}I$-labeled nanoparticles. Confocal microscopy revealed the fluorescein-labeled nanoparticles to be preferentially localized in the perivascular regions, suggesting their extravasation to the tumors through the hyperpermeable angiogenic tumor vasculature. This highly selective tumoral accumulation of nanoparticles was attributed to the leakiness of the blood vessels in the tumors and their long residence time in the blood circulation.

영화를 통한 인천의 장소 정체성 분석 (An Analysis of Incheon's Identity of Place through Movies)

  • 안종욱
    • 한국지역지리학회지
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    • 제11권6호
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    • pp.501-516
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    • 2005
  • '서울의 관문', '제2의 항구도시', '위성 도시' 등은 인천이 인구규모 3위의 광역시임에도 서울의 변경이자 주변적 존재임을 인식시키는 표현들이다. 인천의 학생, 주민들을 비롯한 타지역 사람들에게도 이러한 인식은 무의식적으로 자리하고 있으며, 인천에 대한 부정적 장소감으로 발달하였다. 본 연구는 영화를 중심으로 소설, 교과서 등에 나타난 인천이란 도시 경관의 주변적 이미지를 분석하는 것에서 출발한다. 영화 등의 재현된 텍스트는 현실 공간과 일정한 간극이 존재할 수밖에는 없지만, 현실 공간 인식의 문제점들을 명료화 할 수 있다는 장점을 갖고 있다. 필자는 재현된 텍스트의 분석을 통해 인천이 갖고 있는 장소감들의 근원을 살펴보고자 하며, 나아가 Deleuze의 노마디즘을 기반으로 하여 주변성, 종속성, 자본과 경제 우선주의 대해 끊임없이 도전하는 능동적 주체로서의 '탈주'를 인천이 만들어가야 할 새로운 장소 정체성의 지향으로 제시하고자 한다.

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움직임 특성을 이용한 새로운 고속 움직임 예측 방법 (A New Fast Motion Search Algorithm Using Motion Characteristics)

  • 이성호;노대영;장호연;오승준;안창범
    • 대한전자공학회논문지SP
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    • 제40권2호
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    • pp.20-28
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    • 2003
  • 최근 들어 ASIC(Application Specific IC)이나 소형 시스템에서 사용할 수 있는 더 빠르고 정확한 움직임 벡터 예측방법이 요구되고 있다. 전역탐색(Full Search: FS) 방법은 탐색영역의 모든 화소들을 탐색하여 움직임 벡터를 예측하는 방법으로 화질과 PSNR은 좋지만 반면에 많은 계산량이 요구된다. 기존의 고속 알고리즘들은 탐색 회수를 제한함으로써 계산량을 줄였기 때문에 움직임 벡터 예측의 정확도가 낮고, 움직임 보상시 SAD(Sum of Absolute Difference) 값이 높아지는 것을 감수해야한다. 본 논문에서는 영상에서의 현재 블록과 주변 블록과의 공간적인 상관도를 고려하여 예측된 움직임 벡터 (Predicted Motion Vector: PMV)를 이용하는 고속 움직임 탐색 방법을 제안한다. PMV 방법은 주변 블록의 움직임 벡터를 이용한 기존 방법들 보다 명확하고 간결하게 탐색을 수행할 수 있다. PMV 방법이 대표적인 기존 방법인 Nearest-Neighbors Search(NNS) 방법보다 속도 및 정확도 면에서 성능이 양호함을 대표적인 실험 시퀀스를 통하여 보였다.

피카소의 작품에 나타난 뮤즈별 컬러 칩 도출과 적용 (The extraction and application of the color chip represented in the work of Picasso according to his muses)

  • 이금희
    • 복식문화연구
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    • 제23권2호
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    • pp.193-212
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    • 2015
  • The purpose of this study is to analyze the characters and images of Picasso's muses, to extract the color chip from the works of Picasso, and to apply these results to fashion design. The study includes a literature review, an analysis of visual materials. The results are as follows. Fernande, who was cheerful and voluptuous, was depicted with pink-brown, a few browns, grey, black, white, and green and represents an ethnic and elegant image. Eva, a star-crossed lover, was depicted with a few browns, black, and pale-yellow and represents a gorgeous and natural image. Olga, who was jealous and sickly wife, was depicted with a few blues, browns and neutral-color and represents a classic and dandy image. Th${\acute{e}}$r${\grave{e}}$se, who was innocent and sweet, was depicted with the bright and pastel colors of red, green, violet, and yellow and of white, blue, brown, and black and represents a romantic, pretty, and casual image. Dora, who was intellectually and emotionally- challenging, was depicted with the strong colors of red, yellow, green, and blue, which are in contrast to black and also to white, grey and brown and represents a wild and dynamic image. Gilot, who was strong-willed and prideful, was depicted with the symbolic color of green, a color contrasting with black and white, grey, and pale brown and represents a clear, cool casual and modern image. Jacqueline, the self-giving and reclusive wife, was depicted with deep red, blue, green, black, white, dark brown, grey represents a formal, dandy, and chic image.

The impact fracture behaviors of CFRP/EVA composites by drop-weight impact test

  • Go, Sun-Ho;Kim, Hong-Gun;Shin, Hee-Jae;Lee, Min-Sang;Yoon, Hyun-Gyung;Kwac, Lee-Ku
    • Carbon letters
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    • 제21권
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    • pp.23-32
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    • 2017
  • A drop weight impact test was conducted in this study to analyze the mechanical and thermal properties caused by the changes in the ratio of carbon fiber reinforced plastic (CFRP) to ethylene vinyl acetate (EVA) laminations. The ratios of CFRP to EVA were changed from 10:0 (pure CFRP) to 9:1, 8:2, 6:4, and 5:5 by manufacturing five different types of samples, and at the same time, the mechanical/thermal properties were analyzed with thermo-graphic images. As the ratio of the CFRP lamination was increased, in which the energy absorbance is dispersed by the fibers, it was more likely for the brittle failure mode to occur. In the cases of Type 3 through Type 5, in which the role of the EVA sheet is more prominent because it absorbs the impact energy rather than dispersing it, a clear form of puncture failure mode was observed. Based on the above results, it was found that all the observation values decreased as the EVA lamination increased compared with the CFRP lamination. The EVA lamination was thus found to have a very important role in reducing the impact. However, the strain and temperature were inversely propositional.

국방용 감시카메라를 위한 적응적 영상화질 개선 알고리즘 (Adaptive Video Enhancement Algorithm for Military Surveillance Camera Systems)

  • 신승호;박연선;김용성
    • 한국통신학회논문지
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    • 제39C권1호
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    • pp.28-35
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    • 2014
  • 국경 GOP(General Out Post)나 해안선 지역에 설치되어 운용되는 국방용 감시카메라는 급변하는 기상 및 조명환경에 의해 영상의 화질이 왜곡되고 열화되는 현상이 빈번하게 발생한다. 본 논문에서는 이러한 기상 및 조명환경 변화에 적응적인 화질개선 알고리즘을 제안한다. 기존 화질개선 알고리즘은 급변하는 환경조건에서 영상에 따라 극심한 성능편차를 보이는 문제점이 있는데, 이를 해결하기 위해 레티넥스(Retinex) 모델을 근간으로 환경변화에 적응적인 보정곡선을 이용하여 안개 및 저조도 환경에서 영상의 가시성을 향상시켜 높은 대비와 색상을 자연스럽게 재현하였고 실시간 환경변화에 적응토록 하였다. 또한, HSV 색모델을 가중 혼합하여 색 항상성 (Color Constancy)을 유지시켰으며, 개선과정 중 잡음(Noise)을 제거하여 보다 선명한 영상을 출력토록 하였다. 제안 알고리즘은 실험을 통해 기존 알고리즘 대비 주관적 평가인 MOS 1단계 향상효과 및 객관적 평가인 PSNR 15% 성능향상의 우수성을 입증하였다. 향후 국방감시 카메라 및 시스템에 적용되어 GOP나 해안선 지역의 열악한 기상조건으로부터 열화된 영상을 개선하여 적 침투 및 경계감시 식별에 도움을 주어 시스템의 신뢰성 향상에 기여할 것으로 기대한다.

MOLECULAR GAS AND RADIO JET INTERACTION: A CASE STUDY OF THE SEYFERT 2 AGN M51

  • MATSUSHITA, SATOKI;TRUNG, DINH-V;BOONE, FRDERIC;KRIPS, MELANIE;LIM, JEREMY;MULLER, SEBASTIEN
    • 천문학논총
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    • 제30권2호
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    • pp.439-442
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    • 2015
  • We observed multiple CO transition lines and the HCN(1-0) line at ~ 1" (~ 34 pc) or higher resolution toward the Seyfert 2 nucleus of M51 using the IRAM Plateau de Bure Interferometer (PdBI) and the Submillimeter Array (SMA). All the images show very similar overall molecular gas distribution; there are two discrete clouds at the eastern and western sides of the nucleus, and the western cloud exhibits an elongated distribution and velocity gradient along the radio jet. In addition, high HCN(1-0)/CO(1-0) brightness temperature ratios of about unity have been observed, especially along the radio jet, similar to those observed in shocked molecular gas in our Galaxy. This strongly indicates that the molecular gas along the jet is shocked, that the radio jet and the molecular gas are interacting, and the jet is entraining both diffuse (CO) and dense (HCN) molecular gas outwards from the circumnuclear region. This is the first clear imaging of the outflowing molecular gas entrained by the AGN jet, and showing the detailed physical status of outflowing molecular gas. Since a relatively high HCN(1-0)/CO(1-0) ratio has been observed in the high velocity wing of ultraluminous infrared galaxies, it can also be explained by a similar mechanism to those we describe here.