• 한국안광학회지
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• 제9권1호
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• pp.29-34
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• 2004

본 연구는 타각적 검사장비의 개발을 위한 연구로 PC를 기반으로 Foucault Test (Knife edge Test)를 이용하여 굴절상태의 측정을 목표로 하였다. Knife edge Test를 이용하여 입사광선이 망막에서 반사된 출사광선의 이미지를 CCD 카메라를 사용하여 촬영하고, 그 이미지를 분석하여 반사상의 지름을 측정하여 동공의 크기를 측정하였다. 또한 반사 이미지의 방향으로 굴절상태를 판정하고 반사 이미지의 높이를 측정하여 굴절이상도를 확인하였다. 구면수차는 반사상과 반대방향에 나타나는 부반사 이미지의 명도를 비교하여 측정하였고, 그 크기를 통해 수차값을 계산할 수 있었다.

• 정보과학회 논문지
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• 제44권10호
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• pp.1094-1104
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• 2017

본 논문이 제안하는 동작검출 알고리즘은 빛에 대한 불규칙성을 이용하여 동작영역을 탐색하는 방식으로, 기존 3 way-diff 알고리즘에서 주장한 반사된 빛 영역을 수식화하여 추출한다. 즉, 3 way-diff 알고리즘을 확장한 알고리즘이다. 3 way-diff 알고리즘은 연속된 3개의 이미지를 사용하여 반사된 빛 영역을 추출한다. 이 알고리즘에서 주장하는 반사된 빛 영역이란 이미지 제작과정에서 빛에 의해 발생된 영역으로 모든 사물 주변에 미세하게 생성된다. 이러한 영역을 추출하기 위해 하나의 과정을 보인다. 하지만 이 과정은 단순한 작업일 뿐 빛에 대한 수식이 정의되지 않았다. 본 논문은 3 way-diff 알고리즘에서 주장하는 반사된 빛 영역을 잡음의 일종이라 판단하여 반사된 빛 영역을 추출하는 수식을 정의한다. 제안된 알고리즘과 기존 알고리즘들에 실험을 통해 성능비교를 보인다.

• 한국정밀공학회지
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• 제18권11호
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• pp.51-57
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• 2001

A light beam reflected from a machined surface generally containes information concerning about its surface roughness. This study examines and proposes a surface roughness measurement technique for on-machine measurement of machined surfaces. The technique is based on the measurement of a reflected laser beam pattern and the statistical analysis of its light intensity distribution. The surface roughness was found to be closely related to the standard deviation of the light intensity on the primary axis of the reflected pattern. An image acquisition device is made up of a laser diode, a half mirror, a screen, and a CCD camera. The exact image with the primary and secondary axes of a reflected laser beam pattern is calculated through such image processing algorithm as thresholding, edge detection, image rotation, segmentation, etc. A median filter and a surrounding light correction algorithm are improve the image quality and reduce the measuring error. Using the developed measuring device the effect of screen materials and workpiece and workpiece materials was investigated. Experimental results regarding to relatively high-quality surfaces machined by grinding, polishing, lapping processes have shown the measurement error is within 10% in the range of $0.1{mu}m~0.8{\mu}m R_q.$Therefore, the proposed method is thought to be effectively used when quick measurements is needed with workpieces fixed on the machine.

• 복식
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• 제50권4호
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• pp.131-146
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• 2000

The starting point of this study was that the Orientalism reflected in the modern clothing is realized the different view by Western and Eastern. Based on this regard, this study semiotically analyse that clothing is creating the cultural values and signification and that the western designers are reproducing an ideology as orientalism being the western-oriented thought when expressing the Asian image in the modern clothing. The theoretical sides are based on the semiotic analyses of F. Saussure, C. Peirce, and R. Barthes. By the result observed through this study, the Orientalism reflected in the modern clothing designed by Western designers are discriminative image, mystic image, past-oriented image, natural image, and complex-eclectic image. The discriminative image is reproduced as a savage and uncivilized image. In addition, it regarded as a decorative and superficial image is expressed as if it is an uncharacterized and underdeveloped image in the modern clothing. The mystic image is reproduced as a romantic image to stimulate Westerners'curiosity. That is, Asian image is regarded as a dream and magical image rather than a scientific and rational image. The past-oriented image is expressed through restricting Asian positive image in Asian historical glory. The natural image differs from Western image based on science in the modern clothing. The modern clothing regards the natural image as a primitive and instinctive image. The complex-eclectic image is the pastish pattern through selecting and distributing heterogeneous materials in the modern clothing. This study critically analyzes the western-oriented thought of orientalism in the modern clothing. The results of the study imply that it is critical that we provide a new contact point for the East and the West in the context of our Asian values and traditions.

• 대한전기학회논문지:시스템및제어부문D
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• 제51권6호
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• pp.258-266
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• 2002

This paper proposes the methodology of the image processing algorithm that estimates the pose of the inner-pipe crawling robot. The inner-pipe crawling robot is usually equipped with a lighting device and a camera on its head for monitoring and inspection purpose of defects on the pipe wall and/or the maintenance operation. The proposed methodology is using these devices without introducing the extra sensors and is based on the fact that the position and the intensity of the reflected light from the inner wall of the pipe vary with the robot posture and the camera. The proposed algorithm is divided into two parts, estimating the translation and rotation angle of the camera, followed by the actual pose estimation of the robot . Based on the fact that the vanishing point of the reflected light moves into the opposite direction from the camera rotation, the camera rotation angle can be estimated. And, based on the fact that the most bright parts of the reflected light moves into the same direction with the camera translation, the camera position most bright parts of the reflected light moves into the same direction with the camera translation, the camera position can be obtained. To investigate the performance of the algorithm, the algorithm is applied to a sewage maintenance robot.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국제학술편); KOEX, Seoul; 22-24 Oct. 1991
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• pp.1758-1763
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• 1991

This paper describes a new method to determine the 3D-shape of objects consisting of specular planar surfaces. This method exploits a light source which is made of a diffuse plane with a grid pattern encoded in an M-sequence and uses a single image of the light source reflected by the objects to acquiring orientations and positions of the surfaces of the objects. When grid lines of the light source are reflected by a specular planar surface and perspectively projected on an image plane, a set of lines vanishing at a point are obtained on the image plane. The orientation of the specular planar surface is determined by using the vanishing point, and the position is determined by using the correspondence between lines on the image and lines on the light source, which is obtained by employing a characteristic regularity of the M-sequence. Before the vanishing points are calculated, the lines on the image are classified and correlated with the surfaces of objects by using slopes and positions of the lines and the regularity of the M-sequence. This method requires only a single image.

• 복식문화연구
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• 제8권4호
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• pp.562-576
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• 2000

The purpose of this study is to semiotically reinterpret the Korean beauty and symbol inhering in the modern clothing of Korean designers as the context of traditional culture through regarding the clothing including hegemony that is controlling the Korean society and culture as a sign. The theoretical framework for analysis was derived from the semiotically analytic methods of F. Saussure and R. Barthes. The results of the study are as follows ; Korean images reflected in the modern clothing designed by Korean designers are humanistic image, environmental-friendly image, totemic and mythlogical image, equal and peaceful image, and metaphorical and metonymical image. Conclusively, developing a creative design based upon the interpretation of our unique and traditional culture, the clothing could be newly made of historical and cultural resources in the modern lives. If so, I think that the clothing will be not only the visual and decorative art, but also an information which contains implication of our culture, and finally can be established.

• 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.

• 한국항공우주학회지
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• 제49권1호
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• pp.13-20
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• 2021

본 논문에서는 반사된 면적 결과와 반사된 위치 결과를 중첩하고, 가시화된 이미지에서 픽셀의 최대값에 대한 비율로 윤곽선을 추출하여 손상 크기를 추정하는 알고리즘을 제안하였다. 반사된 신호의 면적을 구하기 위해서 누적함수 특성벡터 알고리즘을 사용하였고, 반사된 신호의 위치를 구하기 위해서 신호 상관관계를 이용해서 측정신호로부터 손상 신호를 분리하였다. 그리고 제안한 손상크기 추정 알고리즘을 복합재 평판에서 실험 수행하여 검증하였다. 임의의 위치에서 반복 실험을 수행해서 제안된 알고리즘이 반복에 따른 재현성이 있음을 검증하였고, 손상크기 변화에 따라 손상 크기를 추정하고 분별할 수 있음을 검증하였다.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1984년도 추계학술발표회 논문집
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• pp.96-99
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• 1984

In this study, the underwater acoustic images were obtained by ultrasonicwave. The experiment was performed in the anechoic watertank, using a passive sonar array for one and two sound source respectively by X-Y scanning technique. The receiving array was consist of 8 disc type transducers with 1.5cm diameter at 25KHz resonance frequency. The scanned data were processed by the FORTRAN IV algorithm for the reconstruction of image, and the image had some noise due to the surface reflected waves. As the result, it was found that the acoustic imaging by electrical deflection and dynamic focusing technique is applicable to SONAR with the suppression of surface reflected wave.