• Journal of Korean Society for Geospatial Information Science
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• v.11 no.1 s.24
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• pp.51-59
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• 2003

This study intended to extract the spatial data and attribute data from the images of terrestrial and aerial photographs and to compile the digital map from the images using various kinds of photogrammetric analysis. The Three Dimensional Frame Model (3DFM) was produced from multiple images of terrestial photographs, and the Three Dimensional Photo Image Model (3DPIM) was made using 3DFM and image patches of terrestrial photo, which is useful for identifying the feature and characteristics of the object. In addition, the spatial data base for the buildings, roads and supplementary facilities in the objective area was updated by the vectorizing procedures with small scale areal photos.

• The Optical Journal
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• s.110
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• pp.44-52
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• 2007

아시아를 대표하는 국제 규모의 디지털 이미징 전시회인 '2007 서울국제사진영상기자재전/디지털영상전' 이 지난 5월 17일부터 20일까지 나흘간의 일정으로 코엑스 본관 1층 태평양홀에서 성대하게 개최됐다. 금년에 16회째를 맞이한 이 전시회에는 19개 국에서 175여 개 사(570여개 부스)가 참가하여 급속한 변화와 성장을 거듭하고 있는 다양한 디지털 사진 영상장비를 선보였다. 특히 삼성테크윈을 비롯하여 카메라 메이저 업체들이 대거 참가하여 포토쇼의 '꽃' 이라고 할 수 있는 디지털 카메라를 선보이고 다양한 체험 이벤트를 벌여 전시회 분위기를 한껏 고조시켰다. 전시기간동안 수많은 전문.취미 사진가들을 비롯하여 세계 각국의 바이어들까지 총 6만여 명의 참관객들이 전시장을 찾아 사진영상분야에 대한 뜨거운 관심과 호응도를 확인할 수 있는 계기가 되었다.

• The Optical Journal
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• s.110
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• pp.14-15
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• 2007

아시아를 대표하는 국제 규모의 디지털 이미징 전시회인 '2007 서울국제사진영상기자재전/디지털영상전' 이 지난 5월 17일부터 20일까지 나흘간의 일정으로 코엑스 본관 1층 태평양홀에서 성대하게 개최됐다. 금년에 16회째를 맞이한 이 전시회에는 19개 국에서 175여 개 사(570여개 부스)가 참가하여 급속한 변화와 성장을 거듭하고 있는 다양한 디지털 사진 영상장비를 선보였다. 특히 삼성테크윈을 비롯하여 카메라 메이저 업체들이 대거 참가하여 포토쇼의 '꽃' 이라고 할 수 있는 디지털 카메라를 선보이고 다양한 체험 이벤트를 벌여 전시회 분위기를 한껏 고조시켰다. 전시기간동안 수많은 전문.취미 사진가들을 비롯하여 세계 각국의 바이어들까지 총 6만여 명의 참관객들이 전시장을 찾아 사진영상분야에 대한 뜨거운 관심과 호응도를 확인할 수 있는 계기가 되었다.

• The korean journal of orthodontics
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• v.39 no.5
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• pp.289-299
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• 2009

Objective: The purpose of the present study was to evaluate the effectiveness of the use of Head Posture Aligner (HPA) during cone-beam computed tomography (CBCT) scan in generation of frontal cephalograms using 3D CBCT images. Methods: CBCT scans and frontal cephalograms were made in 30 adult individuals. While a couple of CBCT scan was made for one subject, one was made with conventional method, without use of HPA, the other was acquired with the use of HPA. After creation of virtual frontal cephalogram from each 3D CBCT image, it was traced and compared with the tracing of real frontal cephalogram. Results: In the comparison of the measurements, the virtual cephalograms with the use of HPA did not show statistically significant differences with the real cephalograms whereas the virtual cephalograms without the use of HPA presented significant differences with real cephalograms in many measurements. In the correlation analysis with the measurements of the real cephalograms, the virtual cephalograms with the use of HPA showed higher correlations in all measurements than the virtual cephalograms without the use of HPA. Conclusions: Measurements from CBCT-generated cephalograms become similar to those from real cephalograms with the use of HPA during CBCT scan. Thus, the use of HPA is suggested during the CBCT scan in order to construct accurate virtual frontal cephalograms using 3D CBCT images.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.14 no.1
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• pp.1-7
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• 1996

The idea of digital photogrammetry was first introduced into the photogrammetric community in early 1960s'. At that time, it was impossible to implement the idea due to inferior computer and digital image processing technology With the recent advancements in computer hardware/software and image processing techniques, digital photogrammetry has made its entry into the field of photogrammetry. The advent of digital photogrammetry also resulted from the increasing amount of digital data acquired through satellites, CCD cameras and digital scanning of photographs. Obviously, the major distinction between conventional photogrammetry and digital photogrammetry lies in the nature of primary input data (analogue versus digital), which could lead to a fully automated digital photogrammetric workstation. However, since digital photogrammetry is in its infant stage, virtually every task is an unsolved problem due to lack of understanding of theories and techniques. Upon considering the increasing demand of efficient digital mapping method and economical GIS database generation, the union of GIS and digital photogrammetry becomes ever clear. In this paper, the author addresses the current status of digital photogrammetry such as digital imagery and digital photogrammetric workstation as well as the role of digital photogrammetry in GIS.

• Tunnel and Underground Space
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• v.21 no.1
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• pp.82-92
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• 2011

Stereophotogrammetry is used to extract spatial information of an object by constructing a stereo-image from two or more photos. In this study, stereophotogrammetry was adopted for analyzing blast fragmentation of rock blocks in a quarry site. 2D image processing and stereophotogrammetry were applied to the fragmentation analysis of rock blocks horizontally scattered in a laboratory, and their results were compared with physical measurements using a water tank. Fragmentation of rock muckpiles was estimated in laboratory and field tests by using the stereophotogrammetry and statistical analysis.

• Journal of the Korean Association of Geographic Information Studies
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• v.23 no.1
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• pp.41-50
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• 2020

The National Geographic Information Institute of Korea takes digital aerial photograph images every two years to make and modify/renew the digital map. The cameras for aerial photogrammetry to capture these digital aerial photographs are divided into frame types and line types. Computer vision analysis of aerial photograph images was only possible for frame type. Thus, in this study, Line type aerial photograph images was intended to generate geospatial information through computer vision analysis, and forest geospatial information was created as a method for the utilization of aerial picture images. As a result, geospatial information generated by computer vision analysis of line type aerial photograph images showed that RMSE of horizontal and vertical position errors was less than quadruple that of GSD. Forest geospatial information was generated using geospatial information generated by computer vision analysis. It was confirmed that extraction of the crown of tree and calculation of tree height are possible. Through this study, it is expected that utilization of aerial photograph images will be improved.

• Journal of Korean Society for Geospatial Information Science
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• v.1 no.2 s.2
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• pp.83-96
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• 1993

The orthophto map is seen as the form of picture with the uniform reduced scale as the current terrain map. Thus it provides a reasonable feeling of scene and is easy to be interpreted. Furthermore, digital orthophoto is currently used as the basic terrain information data of the Geo-Spatial Information System(GSIS). Therefore, the orhtophoto map has high potential use as a future terrain map. This paper studies the method of producing orthophoto map by using the digital satellite imagery data taken from SPOT satellite of France. The production of orthophoto map requires the process of generating orthophoto imagery with digital elevation model, which process is called digital differential rectification. As the final accuracy of orthophoto map depends on that of digital elevation model, the precise and efficient production method of digital elevation model should be preceded. This study investigated the method of producing digital elevation model directly from SPOT satellite imagery and generated ortho-image by resampling the original SPOT imagery through digital differential rectification. Finally, Simple orthophoto map was made by overlaying the ortho-image and the contour map from digital elevation model.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2004.03a
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• pp.335-340
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• 2004

원격탐사 기술의 발달과 지구관측위성의 증가로 다양한 특성을 지닌 영상을 획득이 용이해 징에 따라 영상 합성 기술의 중요성과 활용성이 증가하였다. 영상합성 기술과 합성에 이용되어지는 영상의 특성에 따라 합성의 목적은 다르게 나타날 수 있다. 본 연구의 대상지역은 경상남도 입실이며 그 지역을 촬영한 1:5,000 축척의 흑백항공사진과 1m의 공간해상도의 IKONOS영상을 사용하였다. 본 논문에서는 다른 두 영상을 합성할 때 생기는 제반 문제점을 파악하고 모색하고자 하였다. 기하학적 특성이 다른 두 영상을 합성하고자 할 때 가장 우선시 되어야 할 사항은 두 영상의 기하학적 특성에 따른 위치정확도 문제와 항공사진 각 장의 상이한 명암정보를 표준화시키는 문제이다. 본 연구에서는 이러한 문제점을 해결하기 위해 서로 다른 기하학적 특성으로 인한 왜곡을 정사영상을 제작함으로써 두 영상의 위치 정확도를 높H고 항공사진의 영암정보를 표준화하기 위해 전체영상을 제작하는 방법과 strip별로 제작하는 방법을 제시하여 보았다.

• Journal of KIISE:Computer Systems and Theory
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• v.29 no.3
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• pp.134-142
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• 2002

Quadtree, which is a hierarchical data structure, is a very important data structure to represent binary images. The linear quadtree representation as a way to store a quadtree is efficient to save space compared with other representations. Therefore, it has been widely studied to develop efficient algorithms to execute operations related with quadtrees. The window operation is one of important geometry operations in image processing, which extracts a sub-image indicated by a window in the image. In this paper, we present an algorithm to perform the window operation of binary images represented by quadtrees, using three-dimensional $n{\times}n{\times}n$ processors on RMESH(Reconfigurable MESH). This algorithm has constant-time complexity by using efficient basic operations to route the locational codes of quardtree on the hierarchical structure of $n{\times}n{\times}n$ RMESH.