• Journal of Korea Multimedia Society
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• v.15 no.11
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• pp.1273-1283
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• 2012

In this paper, vision-based positioning algorithm for melon harvesting robot is presented. RGB value of the input image was converted into HSI value then, melon area was extracted after performing the binarization using HUE value. After morphological filtering was applied to remove noise, outermost boundary points were obtained using border following and convex hull method. Elliptical fitting for melons was perform by the RANSAC algorithm, the center point of ellipse, the length of the short and long axis, and rotation angle were obtained. We verified the effectiveness of the proposed method by various simulation experiments and confirmed actual feasibility of the proposed method by applying to the real melon.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.04a
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• pp.157-160
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• 2007

본 논문에서는 입력 영상의 에지를 단일 세그먼트로 구성하고 같은 타원에 속하는 에지 세그먼트를 병합하여 타원검출의 속도와 정확도를 향상시키는 방법을 제안한다. 먼저 분기점은 이용한 라벨링 기법과 코너 패턴 정합 기법으로 연속된 화소들의 집합인 에지 세그먼트를 만든다. 구성된 에지 세그먼트와 Randomized Hough Transform에 의해 타원을 추정하여 병합하고 타원을 결정한다. 위 과정으로부터 얻어진 병합된 에지 세그먼트 집합 하나가 타원 하나를 구성하므로 입력 영상 내의 전체 타원의 개수를 정확하게 추정할 수 있다. 또한 전체 에지 화소들로 타원을 검출하는 기존 방법과 달리 분리된 에지 세그먼트 단위로 타원 변수를 결정하기 때문에 전체 수행시간을 크게 줄일 수 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.15 no.1
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• pp.51-57
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• 1990

In this paper, We design the microwave integrated circuits for a broadband amplifier using elliptic filters and auxilliary networks at input and output. The input and output equivalent circuits of GaAs MESFET modeled unilaterally are adapted for analysis of this amplifier. The experimental results of this amplifier on 4~8GHz frequency range show that its gain, VSWR and noise figure are 10.5dB, 2.1:1 max. and 2.5dB max., repectively.

• Journal of Korea Society of Industrial Information Systems
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• v.19 no.4
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• pp.41-52
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• 2014

In this paper, O-ring size measurement algorithm based on a small machine vision inspection equipment which can replace a expensive and large machine vision inspection equipment is presented. The small machine vision inspection equipment acquires a image from a CCD camera shooting a measurement plane which located on a back light and the proposed size measurement algorithm is apply to the image. For improvement of size measurement accuracy, camera lens distortion correction and perspective distortion correction are conducted by software technique. Consider O-ring's shape, ellipse fitting model is applied. In order to increase the reliability of ellipse fitting, RANSAC algorithm is applied.

• Proceedings of the IEEK Conference
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• 2001.06d
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• pp.243-246
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• 2001

턱 논문에서는 복잡한 배경에서 다양한 조명과 얼굴의 크기 변화를 가지는 영상으로부터 눈을 검출하는 새로운 방법을 제안한다. 반사 대칭 조건과 타원 모델링을 이용하여 먼저 얼굴을 검출하고 그 영역 내에서 수리 형태학을 이용한 valley detection, binary opening을 수행함으로써 눈 후보 영역을 추출한다. 그리고 정확한 눈동자의 위치를 검출하기 위하여 눈동자 정합 마스크를 제안하였다 얼굴 검출 과정에서 타원의 단축 길이를 추정하여 추출된 얼굴 영상의 크기를 정규화 하였다. 정규화 된 얼굴 영상에서 눈 검출에 적합한 형태소(structuring element)를 결정하여 눈 검출 결과를 보다 견실하게 하였다.

• Journal of KIISE:Software and Applications
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• v.32 no.1
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• pp.22-33
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• 2005

In this paper. we propose an image registration algorithm based on variable-sized blocks of ellipsoidal prototype model which is similar in shape to human face. While matching blocks, the existing cylindrical prototype model which only takes into account left and right curvature can accomplish a correct alignment on left and right images. But, registration errors are produced from up and down images because the cylindrical prototype model not reflects characteristics of head shape and jaw structure of human. The proposed method is a block matching algorithm which uses variable-sized blocks with considering left-right and up-down curvature of ellipsoidal face model and can correctly align images by using the correlation between them. We then adapt image mosaic technique to generate a face texture from aligned images. For this purpose, we stitch them with assigning linear weights according to the overlapped region and remove ghost effects to make more realistic facial texture.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.346-348
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• 2003

본 논문에서는 얼굴 형태와 유사한 타원체형 모텔의 가변적 블록크기를 기반으로 하는 영상정렬 알고리즘을 제안한다. 실린더형 모델을 사용한 기존의 방법은 블록정합 수행 시 좌우 곡률을 고려하므로 좌우영상은 정확히 정렬하지만 상하 부분은 사람의 두상모양이나 턱 구조와 다르기 때문에 상하 영상을 정렬할 때 오류가 발생한다. 본 논문에서 제안하는 알고리즘은 얼굴 모델의 상하좌우의 곡률에 따라 가변적인 블록크기론 사용하고 영상의 상관관계를 이용하여 정확한 정렬을 할 수 있도록 한다. 그리고 얼굴 텍스쳐영상을 생성하기 위하여 영상 모자익 기법을 사용하며 영상들이 서로 잘 융합하도록 크로스디졸브(Cross dissolve) 기법을 적용하여 영상을 스티칭한다.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.11
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• pp.1472-1475
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• 1999

This paper proposes a new detection method of human faces in grey scale images with cluttered background using a facial template and elliptical structure of the human head. Face detection technique can be applied in many areas of image processing such as face recognition, composition and computer graphics, etc. Until now, many researches about face detection have been done, and applications in more complicated conditions are increasing. The existing technique proposed by Sirohey shows relatively good performance in image with cluttered background, but can apply only to image with one face and needs much computation time. The proposed method is designed to reduce complexity and be applied even in the image with several faces by introducing template matching as preprocess. The results show that the proposed method produces more correct detection rate and needs less computation time than the existing one.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.8
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• pp.839-844
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• 2003

For mass and volume reduction, input demultiplxer and output multiplexer of satellite transponder widely adopt dual-mode waveguide filters fer channel filters. Generally, channel filters of the input demultiplexer are doubly terminated and channel filters of manifold output multiplexer should be singly terminated fur correct operation. This paper gives a tuning method using short-ended dummy cavity for dual-mode cavity filters. Tuning is based on the match of the computed and measured phase response of reflection coefficient. This proposed method is applied to 4-pole dual-mode doubly terminated elliptic response filter and 6-pole dual-mode singly terminated elliptic response filter for demonstration of this new tuning method. It is shown that this method shows good agreement between the experimental and computed results.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.6
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• pp.989-996
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• 2017

The proposed directional pencil beam antenna consists of a waveguide feeder with bended elliptical conductor plate feed and a parabolic curved reflector. Two rectangular apertures located at the broad wall near the end of the feed waveguide inserted from behind the reflector are located at the focus of the reflector and emit electromagnetic energy with bended elliptical conductor plate. This plate is designed to reflect electromagnetic energy primarily and to face the main reflector. The two rectangular apertures located at the waveguide end have inwardly protruding tabs for impedance matching of the antenna system, the shape of the tabs is a truncated oval. The proposed parabolic reflector antenna has a diameter of 400 mm and a focal length of 134.23 mm. The antenna gain is 33.68 dBi at the center frequency of 16.5 GHz, the beam width is $3.3^{\circ}$ and the reflection loss is -15 dB. Using the HFSS-IE, simulation results are performed to validate the proposed antennas.