• 한국기계가공학회지
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• 제9권5호
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• pp.70-75
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• 2010

In this paper, laser marking systems dedicated to cylinderical parts was developed. We first develop the marking device which consists of Nd-Yag laser, galvano scanner and additional rotational axis, then develop algorithm for supporting the digital image with bmp data format. Additional rotational axis is so attached as to rotate the cylinderical parts for marking its whole surface. The image is separated into line by line and the separated line image is sent to galvano scanner while rotating the additional axis simultaneously. CxImage library, famous open source code, is employed for the image processing. The developed method was tested with various images and shows that it reduces marking time significantly without reducing marking quality.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.II
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• pp.318-324
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• 2000

Ultrasonic and magnetic resonance imaging systems are used to visualize the interior states of biological objects. These nondestructive methods have many advantages but too much expensive. And they do not give exact color information and may miss some details. If it is allowed to destruct some biological objects to get the interior and exterior information, constructing 3D image from the series of the sliced sectional images gives more useful information with relatively low cost. In this paper, PC based automatic 3D model generator was developed. The system was composed of three modules. One is the object handling and image acquisition module, which feeds and slices objects sequentially and maintains the paraffin cool to be in solid state and captures the sectional image consecutively. The second is the system control and interface module, which controls actuators for feeding, slicing, and image capturing. And the last is the image processing and visualization module, which processes a series of acquired sectional images and generates 3D graphic model. The handling module was composed of the gripper, which grasps and feeds the object and the cutting device, which cuts the object by moving cutting edge forward and backward. Sliced sectional images were acquired and saved in the form of bitmap file. The 3D model was generated to obtain the volumetric information using these 2D sectional image files after being segmented from the background paraffin. Once 3-D model was constructed on the computer, user could manipulate it with various transformation methods such as translation, rotation, scaling including arbitrary sectional view.

• Agricultural and Biosystems Engineering
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• 제1권2호
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• pp.95-99
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• 2000

Nondestructive methods such as ultrasonic and magnetic resonance imaging systems have many advantages but still much expensive. And they do not give exact color information and may miss some details. If it is allowed to destruct some biological objects to get interior and exterior informations, constructing 3D image form a series of slices sectional images gives more useful information with relatively low cost. In this paper, a PC based automatic 3D model generator was developed. The system was composed of three modules. The first module was the object handling and image acquisition module, which fed and sliced the object sequentially and maintains the paraffine cool to be in solid state and captures the sectional image consecutively. The second one was the system control and interface module, which controls actuators for feeding, slicing, and image capturing. And the last was the image processing and visualization module, which processed a series of acquired sectional images and generated 3D volumetric model. Handling module was composed of the gripper, which grasped and fed the object and the cutting device, which cuts the object by moving cutting edge forward and backward. sliced sectional images were acquired and saved in a form of bitmap file. 2D sectional image files were segmented from the background paraffine and utilized to generate the 3D model. Once 3-D model was constructed on the computer, user could manipulated it with various transformation methods such as translation, rotation, scaling including arbitrary sectional view.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 춘계종합학술대회 A
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• pp.298-301
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• 2008

벡터 그래픽스는 수학적 정보를 이용하여 이미지를 표현하기 때문에 이미지 손상 없이 쉽게 확대 축소가 가능하며, 비트맵 방식으로 표현되는 이미지보다 더 작은 파일 크기를 가진다. 본 논문에서 제안하는 벡터 그래픽 래스터라이저는 개선된 스캔라인 엣지 플래그 방식을 사용하여 설계되었으며 클리핑과 슈퍼샘플링 과정을 같이 수행한다. OpenVG 2D 벡터 이미지를 사용하여 검증되었다. 본 논문에서 제안하는 가속기는 Tiger image의 랜더링에 초당 5 프레임의 성능을 가진다.

• 한국정밀공학회지
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• 제23권11호
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• pp.116-125
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• 2006

MEMS and LIGA technologies have been used for fabricating microstructures, but their shape is not 3D because of difficulty for preparation of many masks. To fabricate 3D microstructures, microstereolithography technology based on Digital Micromirror Device($DMD^{TM}$) was introduced. It has no need of masks and is capable of fabricating high aspect ratio microstructures. In this technology, STL file is the standard format as the same of conventional rapid prototyping system, and 3D parts are fabricated by layer-by-layer according to 2D section sliced from STL file. The UV light source is illuminated to DMD which makes bitmap images of 2D section, and they are transferred and focused on resin surface. In this paper, we addressed optical design of microstereolithography system in consideration of light path according to DMD operation and image-forming on the resin surface using optical design program. To verify the performance of implemented microstereolithography system, 3D microstructures with complexity and high aspect ratio were fabricated.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.896-898
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• 2006

Geological symbols are used for describing geological information. But it's not ease to represent them in commercial GIS s/w, because of their complexity and diversity. This study aims at developing the geological symbol mapping tool for representing geological symbol on user's geological information. Geological symbol mapping too is a web application which can handle SHP format and map geological symbols based on user's requests. It manages geological symbols and mapping codes and symbols are mapped within the geological boundary according to the corresponding non-spatial field that is a mapping code. The system has functions to upload a user's GIS file, and download the converted image file which is mapped geological patterns. The system displays converted images to be check mapping results. Because the symbols are simple bitmap files, user(system manager) can design and apply them rapidly without considering specific commercial S/W. Thus, it is expected that this system plays an important role to disseminate geological standards such as geological symbols. And the results of this study can be used for developing global geological symbols and applying them easily

• 전기전자학회논문지
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• 제12권2호
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• pp.124-130
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• 2008

벡터 그래픽스는 좌표 정보를 이용하여 이미지를 표현하기 때문에 이미지 퀄리티의 손실 없이 쉽게 확대 축소가 가능하며, 일반적으로 래스터 그래픽스로 표현되는 이미지보다 더 작은 파일 크기를 가진다. 본 논문에서 제안하는 벡터 그래픽 가속기는 개선된 스캔라인 엣지 플래그 방식을 사용하여 엣지의 정렬과정을 수행하지 않고 렌더링을 수행할 수 있도록 설계되었으며 OpenVG 2D 벡터 이미지를 사용하여 검증되었다. 본 논문에서 제안하는 가속기는 Tiger image를 기준으로, 테셀레이션을 수행하는데 12ms, 전체 이미지 렌더링에 208ms의 시간이 소요되며, Tiger image 기준으로 약 초당 5 프레임의 성능을 가진다.

• 한국산학기술학회논문지
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• 제5권3호
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• pp.236-240
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• 2004

PXA255 프로세서 기반의 내장형 보드에 QT/Embedded 2.3.7 버전을 포팅하여 원격지의 화상 감시 시스템을 구현하였다. 클라이언트 단말기로서의 역할을 하는 PXA255보드에서 이더넷 통신방법에 의해 원거리의 의 Host PC로 접속하여 PC에 연결되어 있는 카메라 영상을 확인할 수 있도록 하였다. 또한 PCI 인터페이스 카드를 설계하여 카메라의 Pan/Tilt 에 대한 모터제어가 가능하도록 하였다. 즉, 320×240크기의 컬러 비트맵 형식의 영상을 타깃보드의 TFT-LCD화면으로 출력하고 사용자가 터치스크린 입력방식으로 Pan/Tilt 에 대한 원하는 위치를 선택하면 호스트 PC의 모터가 회전함으로서 원하는 위치의 영상을 감시할 수 있도록 하였다.

• 한국의류산업학회지
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• 제1권2호
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• pp.119-126
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• 1999

The purpose of this study was to serve as a basis for the creation of new design. For attaining the purpose, an investigation was made into the actual condition or problems of domestic and foreign fashion design, and fashion design information was acquired from the Internet. Then, taking the acquired information as the basic data for merchandising, an attempt was made to work out an outline by using the Corel-Trace program, a widely-used computer software, and to modify it by using the Corel-Draw program. The findings of this study were as below: 1) The informations provided by domestic home-pages were largely made up of fashion news and articles on the trend of fashion, but included few of picture report. Almost all of them weren't developed into a database by item or detail. The foreign fashion design web-site were numerous in number, providing diverse information. They offered not only moving images or picture report on fashion show, leading models, photo gallery or fashion trend, but up-dated data everyday. 2) A way to create a design to meet a designer's target is recommended in this study. At first, the fashion information acquired through computer network would be handled by the Corel-Trace program. After Bitmap image would be converted into Vector image, that would be modified by the Corel-Draw program to create a design to suit a designer's target.

• 전자공학회논문지
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• 제52권11호
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• pp.79-84
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• 2015

스테가노그래피는 비밀 데이터가 숨겨져 있다는 그 자체를 숨기는 방법을 말한다. Emulab은 연구자가 언제든지 원하는 운영체제 시스템과 네트워크 토폴리지를 구성할 수 있도록 제공하는 프레임워크이다. 본 논문에서는 Emulab 환경에서 스테가노그래피 기법을 처음으로 적용하여 분산 처리가 가능함을 보이고자 한다. 칼라 비트맵 이미지를 사용하여 Emulab 환경에서 한대의 서버와 여러 대의 클라이언트별로 나누어 처리하게 함으로써 알고리즘의 성능을 평가한다. 커버 이미지로 사용하는 칼라 이미지는 RGB 영역으로 각각 나누어지고, 각각의 영역에 대해서 비밀 데이터를 각 클라이언트에서 분산처리하게 하고, 성능을 비교하게 된다. 실험결과에서는 커버 이미지의 크기가 증가함에 따라 클라이언트/서버 구조를 가진 Emulab 환경에서 실행 시간이 지속적으로 향상됨을 보여주고 있다.