• 한국지형공간정보학회:학술대회논문집
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• 2004.10a
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• pp.107-112
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• 2004

소축척 수치지도 및 지형도 제작을 위한 자동화 처리 과정에서는 기하학적 및 논리적인 오류가 발생하고 있고, 기하학적 오류는 많은 부분에서 자동화 처리가 가능하나 논리적 오류는 논리적으로 자동 판단이 곤란한 경우가 많기 때문에 대부분 수작업으로 이루어 지고 있는 실정이다. 따라서, 본 연구에서는 논리적 오류문제를 해결하기 위하여 폴리곤 겹침에 대해서 도로와 건물 폴리곤간의 겹침위치를 탐색하고, 이를 처리하기 위해 유전자알고리즘을 이용하여 프로그램을 개발하였다. 그 결과 지도제작 과정에서의 논리적 오류에 대한 자동화가 가능하도록 하였고, 그로 인한 지도제작 오류를 최소화할 수 있었다.

• Geophysics and Geophysical Exploration
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• v.5 no.2
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• pp.71-77
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• 2002

We developed a modeling and visualization software that can analyze 3-dimensional seismic data. The software divides 3 dimensional space into a series of vertical and horizontal polygons, and allows the various seismic attributes and other spatial information to be stored on these polygons. The program can pick a particular pattern in semi-automatic mode, and store the pattern in the spatial DB. The pattern can be modeled and visualized in 3 dimensional space.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.676-678
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• 2005

최근 3차원 그래픽 기법 중에서도 비실사(Non-Photorealistic Rendering) 기법은 3차원 그래픽의 변형을 통해 사용자와의 원활한 커뮤니케이션을 이끌어 낼 수 있다는 점에서 많은 주목을 받고 있다. 비실사 기법에서는 실루엣 에지를 찾아내고 디스플레이 하는 것이 중요한 과정이며 여러 가지 연구가 행해지고 있다. 지금까지 실루엣 에지 렌더링 연구는 데스크탑 플랫폼에서는 많이 이루어졌지만 모바일 기기에서의 구현을 위한 노력은 부족하였다. 본 논문은 모바일 기기 환경에서의 비실사 기법 적음을 위한 실루엣 에지 렌더링 기법을 제안한다. 모바일 기기 환경에서의 부족한 리소스와 폴리곤 제한을 극복하기 위하여 기존 연구보다 폴리곤 연산의 숫자를 감소시키는 기법을 제시하였다. 이 기법의 적용은 모바일 기기에서의 렌더링 프레임률을 높여주어 원활한 비실사 기법 적용에 도움을 준다.

• Journal of Korean Society for Geospatial Information Science
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• v.12 no.2 s.29
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• pp.61-66
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• 2004

By the advent of the high-resolution Satellite imagery, there are increasing needs in image mosaicking technology which can be applied to various application fields such as GIS(Geographic Information system). To mosaic images, various methods such as image matching and histogram modification are needed. In this study, automated image mosaicking is performed using image matching method based on the multi-resolution wavelet analysis(MWA). Specifically, both area based and feature based matching method are embedded in the multi-resolution wavelet analysis to construct seam line.; seam points are extracted then polygon clipping method are applied to define overlapped area of two adjoining images. Before mosaicking, radiometric correction is proceeded by using histogram matching method. As a result, mosaicking area is automatically extracted by using polygon clipping method. Also, seamless image is acquired using multi-resolution wavelet analysis.

• Journal of the Korean Geographical Society
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• v.41 no.2 s.113
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• pp.139-149
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• 2006

Earlier research works focused on the seasonal patterns and bio-geochemical processes in sand dunes, and the satellite data and aerial photographs have been used only as a backdrop or for the multi-temporal delineation of sand dune area. In order to find the optimal way to extract features' characteristics, Gimnyeong sand dune area was selected as a study site. Field works have been carried out three times to collect ground control points and sand samples for laboratory analyses. The texture of sand dune is classified as fine sand, which has been derived from shell fragments. The sand dune penetrated into the island from northwest to southeast direction. An aerial photograph was re-sampled into one-meter resolution and rectified with software including Erdas Imagine and ENVI. Sub-scenes were chosen as samples for sand dune, urban area and rural area. K-group non-parametric analysis had been done for the geometric and spectral values of enclosed texture patches. Urban areas proved to have significant smaller patches than the others.

• Korean Journal of Remote Sensing
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• v.19 no.4
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• pp.307-317
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• 2003

This paper presents an algorithm that automatically extracts buildings among many different features on the earth surface by fusing LIDAR data with panchromatic aerial images. The proposed algorithm consists of three stages such as point level process, polygon level process, parameter space level process. At the first stage, we eliminate gross errors and apply a local maxima filter to detect building candidate points from the raw laser scanning data. After then, a grouping procedure is performed for segmenting raw LIDAR data and the segmented LIDAR data is polygonized by the encasing polygon algorithm developed in the research. At the second stage, we eliminate non-building polygons using several constraints such as area and circularity. At the last stage, all the polygons generated at the second stage are projected onto the aerial stereo images through collinearity condition equations. Finally, we fuse the projected encasing polygons with edges detected by image processing for refining the building segments. The experimental results showed that the RMSEs of building corners in X, Y and Z were 8.1cm, 24.7cm, 35.9cm, respectively.

• The Optical Journal
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• s.104
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• pp.59-69
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• 2006

레이저 프린터나 디지털 복합기(MFP:MultiFunction Peripheral)에 탑재되는 레이저 기입 광 학계에는 주사 광학 소자(fθ렌즈, fθ미러)나 폴리곤 스캐너라는 광학 장치가 사용되고 있다. 본 고에서는 레이저 기입 광학계에 사용되는 광학 장치를 중심으로, 이들을 대상 으로 하는 최근의 계측 기술을 설명하면서 2020년을 향한 향후의 전망에 대하여 설명하 기로 한다.

• 대한방사선방어학회:학술대회논문집
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• 2011.11a
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• pp.170-171
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• 2011

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.873-874
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• 2010

• Journal of the Korea Institute of Military Science and Technology
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• v.23 no.5
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• pp.494-501
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• 2020

When we develop an OpenGL-based coastline map that displays the high resolution data of GSHHG, it takes tens of seconds until the first scene is rendered. That is because it takes time to tessellate polygons with a huge number of vertices. A commonly used solution is that it converts original data to a customized data in advance, and it displays these. But if we should use original data to display a coastline map, we need to find another solution. In this paper we suggest using a polygon splitting technique to minimize tessellation time. In order to prove its effectiveness, we implemented a software applied this technique and measured its performance. The software applied this technique took a few seconds to display the first scene and we confirmed its effectiveness.