• Journal of Sensor Science and Technology
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• v.10 no.6
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• pp.279-285
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• 2001

In this study, we fabricated the microlens array using very simple and economical method which used Si molds made by bulk etching in HNA and spreaded SU-8 on top of the Si mold. And, we developed fabrication conditions for high fill factor microlens array that is $45{\mu}m$ in height and $150{\mu}m$ in diameter. This microlens array can be used for imaging system like IR detector or projection display. It is expected that it can improve the characteristics of these devices.

• Journal of the Speleological Society of Korea
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• no.87
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• pp.14-17
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• 2008

Nowadays, power-point slides are the common form of presentation at meetings or lectures. However, when it comes to explanation and demonstration, it is difficult to do so effectively on a screen that is projected from a projector. This drawback might lower the level of quality of communication between the speaker and his audience. On top of this, the speaker is constrained to a certain amount of space. Based on this fact, in this work the constructed device can be used as an extension for the existing functions and makes up for the disadvantages of projected presentations by means of a web camera which enjoys ease of use and is economically priced. It would be also used as a virtual projection display for information of tourist cave in the field.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.784-786
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• 2004

프로젝션 화면(projection display) 상에 보여지는 가상의 물체를 사용자가 직접 조작할 수 있는 인터페이스를 제공하기 위해서는 전경 물체를 검출해내는 과정이 필수적이다. 이전의 색상 정보만을 이용하는 방법은 몇 가지 제약 조건을 가지고 있었다. 본 논문은 색상 보정 (color calibration)과 스테레오 정보(stereo information)를 이용하여 프로젝션 화면 내의 전경물체를 검출하는 방법을 제안한다. 실험에서는 프로젝터를 통해 책상 표면에 투사되는 영상과 일반 캠코더를 통해 얻어진 영상 사이의 왜곡을 기하 왜곡과 색상 왜곡으로 정의하여 모델링 하였고, 스테레오 정보를 이용하여 얻어진 최종 결과를 통해 제안된 방법의 실효성을 입증할 수 있었다.

• Journal of the Semiconductor & Display Technology
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• v.9 no.2
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• pp.79-85
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• 2010

In this paper, we propose a web inspection system (WIS) for real-time detection of paper defects which can cause critical fractures during papermaking process. Our system incorporates high speed line-scan camera, lighting system, and detection algorithm to provide robust and precise detection of paper defects in real-time. Since edge defects are very crucial to the paper fractures, our system focuses on the edge region of the paper instead of inspecting the whole paper area. In our algorithm, image projection and sub-pixel operation are utilized to detect the edge defects precisely and connected component labeling and shape analysis techniques are adopted to extract various kinds of the region defects. Experimental results revealed that our web inspection system is very efficient for detecting paper defects during papermaking processes.

• Journal of the Semiconductor & Display Technology
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• v.18 no.2
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• pp.67-72
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• 2019

This paper proposes a new method for the recognition of resistor color band using a color segmentation in a HSI color model. The proposed method firstly segments a resistor in a chromatic color as a ROI from a background. Secondly, the color bands of the resistor are segmented by vertical projection profile using both the intensity and the saturation differentiation and finally, it recognizes the colors of the segmented color bands using hue, saturation and intensity values. The final results are the value of the resistor and the names of the recognized color. The proposed method is implemented using C language in Raspberry Pi system with a camera module for a real-time image processing. Experiments were conducted by using various resistor images. The results show that the proposed method is successful for the recognition of resistor color band.

• 한국전산유체공학회:학술대회논문집
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• 2001.10a
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• pp.157-163
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• 2001

In the present study a mesh generation program is developed for three dimensional flow analyses with complex geometry. By the present program one can define vertices using various coordinate systems and cells for finite volume approach. Rendered display of the generated mesh can be also available in both orthographic and perspective projection modes. Through perspective projection mode, one can check the quality of generated mesh by moving around inside the mesh like a virtual reality. The examples of the program execution is given in the paper.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.744-747
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• 2005

The exploitable efficiency of UHP is very important in a projection system. We always use lens array for light shaping and energy distribution transformation in conventional projection system. Because of the limitation of arc gap and F/# of elements, the utilize efficiency is always dismal. In this paper we try to bring out a new method to reduce the sparkle formed on the PS converter and enhance the system efficiency.

• The Journal of the Korea Contents Association
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• v.7 no.2
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• pp.84-91
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• 2007

Recently, the researches based on vision about user attention and action awareness are being pushed actively for human computer interaction. Among them, various applications of tabletop display system are developed more in accordance with touch sensing technique, co-located and collaborative work. Formerly, although supported only one user, support multi-user at present. Therefore, collaborative work and interaction of four elements (human, computer, displayed objects, physical objects) that is ultimate goal of tabletop display are realizable. Generally, tabletop display system designs according to four key aspects. 1)multi-touch interaction using bare hands. 2)implementation of collaborative work, simultaneous user interaction. 3)direct touch interaction. 4)use of physical objects as an interaction tool. In this paper, we describe a critical analysis of the state-of-the-art in advanced multi-touch sensing techniques for tabletop display system according to the four methods: vision based method, non-vision based method, top-down projection system and rear projection system. And we also discuss some problems and practical applications in the research field.

• Proceedings of the Korea Contents Association Conference
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• 2014.06a
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• pp.493-494
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• 2014

• Proceedings of the Optical Society of Korea Conference
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• 2009.02a
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• pp.385-386
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• 2009