• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1999년도 제29회 춘계학술대회
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• pp.147-155
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• 1999

The film thickness and shape of elastohydrodynamic lubrication is measured by optical interferometer, which is the most precise method for EHL film measurement. However the interpretation of the image pattern from optical viscometer is not easy for two-dimensional shape. A newly developed method of image processing makes it possible to evaluate the film thickness and shape in every point of contact region with two dimensional aspects. In this study, we captured film shape of EHL film from the monochromatic incident light with the Image processing method, which uses phase shift method, and obtained the image analysis method for gray level image in order to qualitatively evaluate film shapes.

• 복식
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• 제50권3호
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• pp.117-131
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• 2000

The purpose of this study is for affirmation about fashion and film industry has very important relationship through the image of film fashion in 1990. To this processing , films in 1990 were analyzed by the back ground, time place, persons's status are expressed in period movie but the person's characters, development of story mood in contemporary movies. The contents of this study are as follows : First, film fashion which was related mass fashion design and concept development and fashion designers as constume services were considered. Second, the change of star image through the 20th century. The roles and new image of film fashion in period movies and contemporary movies in 1990 were searched. Third, proposal and results were confirmed for expansion of fashion industry and film industry together. Finally, from the latter of 20th century, a lot of fashion designers have participated in film works than before, So the images of films were sued and reflected as new mass trend . Especially retro-romantic mood was expressed in fashion trend due to period movie fashion. Also minimal city look and elegance glamourous look are represented cause of contemporary movie fashion. Therefore, the cooperation between film productions and fashion professionals is very important for promotion of Korean culture development in 21st century, 'the century of image'.

• Radiation Oncology Journal
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• 제16권4호
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• pp.497-504
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• 1998

목적 : matrix ion chamber type의 EPID와 video camera based EPID를 이용한 portal image와 기존의 film을 이용한 port film의 영상의 질을 객관적으로 비교 평가하여 EPID의 유용성을 알아보고자 본 연구를 계획하였다. 대상 및 방법 : 1997년 4월부터 10월까지의 인하대 병원과 세브란스 병원에서 방사선 치료를 받은 골반강내 치료 환자 각 10명씩을 대상으로 환자 1명 당 5-10회의 port film과 EPID를 이용한 portal image를 동시에 얻어 비교하였다. 환자의 나이는 32세에서 79세이었고 2명의 AP영상을 제외하고는 모두 PA영상을 얻었다. 환자의 두께는 17cm에서 20cm으로 비교적 균일하였다. beam energy는 10MV X-ray를 사용하였고 dose rate은 100-300MU/min으로 2-10MU을 주어 영상을 얻었다. port film은 Kodak diagnostic film을 사용하였고 film을 넣는 cassette는 납을 전후에 부착한 것을 이용하였다. source to detector(film) distance는 140cm으로 하였다. 영상의 판독은 4명의 치료방사선과 의사에 의해서 시행되었으며 pelvic brim, sacrum, acetabulum, iliopectineal line, symphysis, ischium, obturator foramen, sacroiliac joint를 각각 very clear(1), clear(2), visible(3), not clear(4), not visible(5) 다섯 단계로 나누어 점수를 주었다. 결과 : video camera based EPID를 이용하여 얻은 영상을 비교하여 보았을 때 film을 이용한 port film과 enhancement를 시행하지 않은 portal image는 각 해부학적 구조에서는 차이를 보이지 않았다. 그러나 portal image를 window level로 영상의 변화를 주었을 때는 sacrum과 obturator는 영상의 판독에 도움이 되었다. 또한 portal image를 CLAHE로 enhance를 하였을 때는 모든 해부학적 구조물의 판독이 film보다 용이한 것으로 나타났다. matrix ion chamber type의 EPID를 이용하여 얻은 영상에서도 역시 port film과 영상의 변화를 주지 않은 portal image간에는 커다란 차이를 보이지 않았으나, portal image를 window level로 변화를 주었을 경우는 portal film에 비하여 영상의 질이 더욱 좋아지을 알 수 있었다. 결론 : 방사선 치료를 받는 환자 중에서 골반강의 영상에서는 EPID의 영상의 질은 기존의 port film과 비교하여 차이가 없었으며, window level로 영상에 변화를 주거나 enhance를 하였을 경우는 port film보다 더 나은 영상을 얻을 수 있어 기존의 port film을 대체 할 수 있을 것으로 생각된다.

• Journal of Mechanical Science and Technology
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• 제17권11호
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• pp.1704-1713
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• 2003

Point contact film thickness in elastohydrodynamic lubrication (EHL) is analyzed by image processing method for the images from an optical interferometer with monochromatic incident light. Interference between the reflected lights both on half mirror Cr coating of glass disk and on super finished ball makes circular fringes depending on the contact conditions such as sliding velocity, applied load, viscosity-pressure characteristics and viscosity of lubricant under ambient pressure. In this situation the film thickness is regarded as the difference of optical paths between those reflected lights, which make dark and bright fringes with monochromatic incident light. The film thickness is computed by numbering the dark and bright fringe orders and the intensity (gray scale image) in each fringe regime is mapped to the corresponding film thickness. In this work, we developed a measuring technique for EHL film thickness by dividing the image patterns into two typical types under the condition of monochromatic incident light. During the image processing, the captured image is converted into digitally formatted data over the contact area without any loss of the image information of interferogram and it is also interpreted with consistency regardless of the observer's experimental experience. It is expected that the developed image processing method will provide a valuable basis to develop the image processing technique for color fringes, which is generally used for the measurement of relatively thin films in higher resolution.

• 한국콘텐츠학회논문지
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• 제10권7호
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• pp.169-178
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• 2010

본고는 영화와 관련된 개념과 이론에 대한 들뢰즈의 사유를 바탕으로 히치콕 영화를 이론적으로 재고찰했다. 이를 통해 영화가 사회과학과 예술학의 학문적 분파로서는 물론 철학으로서의 학문적 의의도 가질 수 있음을 논증하고자 했다. 연구결과에 의하면, 들뢰즈는 히치콕이 지각, 행동, 감화-이미지를 틀 지우고 변형시킬 수 있는 정신-이미지를 영화에 활용함으로써 인물과 인물, 인물과 사건, 사건과 사건 사이의 추상적이고 자연적인 관계를 포함해 그 관계가 전개되는 방식도 이미지로 대상화했음을 알 수 있었다. 또한 들뢰즈는 히치콕 영화를 통해 정신-이미지가 영화의 의미를 전환시키고, 영화적 본질 또는 정신적 관계항으로서의 카메라가 이미지를 특정 형식으로 틀 지우는 동시에 그 이미지에 침투해 변형시킨다는 점을 강조하고 있었다. 본고는 들뢰즈의 영화에 대한 사유를 영화이론에 일반화하는데 적지 않은 문제가 있음을 논의의 한계로 제한하고 있지만, 영화와 철학의 관계에 대한 실천적 논의를 위한 이론적 성찰의 계기로서 새로운 연구문제를 탐색하는데 의의를 두고 있다.

• Tribology and Lubricants
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• 제16권5호
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• pp.317-323
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• 2000

The film thickness and shape of elastohydrodynamic lubrication is measured by optical interferometer, which is the most precise method for EHL film measurement. However, the interpretation of the image pattern from optical viscometer is not simple for two-dimensional shape. A newly developed method of image processing makes it possible to evaluate the film thickness and shape in every point of contact region with two dimensional aspects. In this study, we captured the film shape of EHL film by the monochromatic incident light and analyzed the film thickness with the image processing method, which uses phase shift method. From the values of intensity in fringes, the qualitative feature of film thickness in the contact area are obtained by using Zernike polynomial

• Journal of Welding and Joining
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• 제27권2호
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• pp.51-56
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• 2009

Film based radiography imaging technique has been applied to the non-destructive test in medical, aircraft, and power industries contributing to the development of the industries. However, the complex process for imaging and analysis has increasingly demanded the reformation of the radiography test. A digital radiography imaging technologies has been com out from the demand. This study was mainly focused on the assessment on the accuracy for the each image from digital radiography test and film radiography test was proven to crate a better image in sensitivity than film radiography test. In the IQI(Image quality indicator) transmission test, one or two more line can be seen in digital image than in film image. When applying to the boiler tube weld, film image is detectable to the 1.0mm depth flaw; and digital image to the 0.5mm depth flaw. As a result of this study, digital radiography technology is determined to enhance the image quality, compared to film radiography technologies

• 동력기계공학회지
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• 제12권6호
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• pp.70-77
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• 2008

The purpose of this study is to compare the quality of digital radiography image with that of classical film images for welded structure in power plants. The CMOS(Complementary Metal Oxide Semiconductor) flat panel detecter and Agfa D5 film are used to image flaw specimens respectively. In the test, CMOS flat panel detector has been determined to have a better image than that of film image. In the IQI(Image Quality Indicator) transmission test, one or two more line can be seen in digital image than in film image. Digital Radiography Test enabled to successfully detect all defects on the weld specimens fabricated with real reheat stem pipe and boiler tube as well. In the specific comparison test, Digital radiography test detected micro flaws in the size of 0.5 mm in length by 0.5 mm in depth. However, film test has limited it to 1.0 mm in length by 1.0 mm in depth. As a result of this study, digital radiography technology is estimated well enough to perform the inspection in the industry with far more cost effective way, compared to the classical film test.

• 대한전자공학회논문지SP
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• 제48권5호
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• pp.1-9
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• 2011

본 논문에서는 웨이블릿 변환을 이용하여 필름 영상에 존재하는 선형 스크래치를 검출하고 이를 제거하는 기술을 제안한다. 현재까지 스크래치 검출과 복원에 대한 많은 연구가 독립적으로 진행되어 왔는데, 그 이유는 영화가 요구하는 높은 품질과 그에 필요한 방대한 계산량 등의 문제점 때문이다. 본 논문에서는 이러한 문제점을 극복하기 위해 영상을 3-레벨 웨이블릿을 변환하고, 웨이블릿 계수축소와 보간법을 이용하여 선형 스크래치의 검출과 제거를 동시에 수행한다. 실험결과를 통하여 본 논문에서 제안하는 방법은 기존 스크래치 제거 방법보다 적은 계산량으로 정확하게 선형 스크래치를 검출하고 제거함을 알 수 있다. 또한 제안하는 방법은 상용화 되어 있는 고전 영화 복원 시스템에 추가하여 사용이 가능하다.

• 한국정보기술학회 영문논문지
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• 제10권2호
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• pp.153-166
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• 2020

DDI(Display Driver IC) are used to drive numerous pixels that make up display. For stable driving of DDI, it is necessary to attach a protective film to shield electromagnetic waves. When the protective film is attached, defects often occur if the film is inclined or the center point is not aligned. In order to minimize such defects, an algorithm for correcting the center point and the inclined angle using camera image information is required. This technology detects the corner coordinates of the protective film by image processing in order to correct the positional defects where the protective film is attached. Corner point coordinates are detected using an algorithm, and center point position finds and correction values are calculated using the detected coordinates. LUT (Lookup Table) is used to quickly find out whether the angle is inclined or not. These algorithms were described by Verilog HDL. The method using the existing software requires a memory to store the entire image after processing one image. Since the method proposed in this paper is a method of scanning by adding a line buffer in one scan, it is possible to scan even if only a part of the image is saved after processing one image. Compared to those written in software language, the execution time is shortened, the speed is very fast, and the error is relatively small.