• Journal of Korea Multimedia Society
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• v.16 no.9
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• pp.1044-1056
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• 2013

This paper presents an approach for detecting and measuring human skin pigmentation. In the proposed scheme, we extract a skin area by a GMM-EM clustering based skin color model that is estimated from the statistical analysis of training images and remove tiny noises through the morphology processing. A skin area is decomposed into two components of hemoglobin and melanin by an independent component analysis (ICA) algorithm. Then, we calculate the intensities of hemoglobin and melanin by using the projection transformed block coefficient and determine the existence of skin pigmentation according to the global and local distribution of two intensities. Furthermore, we measure the area and density of the detected skin pigmentation. Experimental results verified that our scheme can both detect the skin pigmentation and measure the quantity of that and also our scheme takes less time because of the location histogram.

• Journal of Advanced Navigation Technology
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• v.16 no.2
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• pp.240-246
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• 2012

The Hilbert transform, which has been hitherto discussed in coherent imaging, is for the first time investigated in the context of incoherent imaging. Because the Hilbert transform of the information is superposed coherently with the original light field. We present a two-pupil optical heterodyne scanning system and analyze mathematically the design of its two pupils such that the optical system can perform the Hilbert transform on incoherent objects. In this paper, we review and formulate the definition of an analytic signal of a function and from which we can obtain the Hilbert transform of the function. and we analyze the design of pupils so as to obtain the Hilbert transform and show some 2-D simulations. Computer simulation results of the idea clarify the theoretical results.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.10
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• pp.2321-2330
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• 2015

A variety of studies for indoor positioning are now being in progress due to the limit of GPS that becomes obsolete in the room. However, most of them are based on private wireless networks and the situation is difficult to commercialize them since they are expensive in terms of installation and maintenance costs, non-real-time, and not accurate. This paper applies the mark recognition algorithm used in existing augmented reality applications to the indoor vehicle positioning application. It installs floor marks on the ground, performs the perspective transformation on it and decodes the internal data of the mark and, as a result, it obtains an absolute coordinate. Through the geometric analysis, it obtains current position (relative coordinates) of a vehicle away from the mark and the heading direction of the vehicle. The experiment results show that when installing the marks every 5 meter, an error under about 30 cm occurred. In addition, it is also shown that the mark recognition rate is 43.2% of 20 frames per second at the vehicle speed of 20km/h. Thus, it is thought that this idea is commercially valuable.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.390-390
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• 2011

본 연구는 기초기술연구회의 위성정보 활용 지원 운영사업(과제명: 위성영상을 이용한 하천정보 생산 및 활용에 관한 연구)의 연구비 지원에 의해 수행되었습니다. 지난 2010년 6월 발사된 천리안 위성이 약 9개월간의 정지궤도 시험운행을 마치고 본격적으로 위성자료 서비스를 시작함에 따라 한반도 악기상 관측 및 예측 정확도 향상에 기여할 것으로 예상된다. 최근 기후분야 외에도 수자원, 방재, 농업, 해양 등 다양한 응용분야에서 기상위성을 활용하고자 하는 연구가 수행되고 있으며 자료제공 시간의 단축과 기상자료 산출물의 제공으로 천리안 위성은 향후 광범위하게 활용 될 것으로 예상된다. 본 연구는 천리안 위성의 수자원 분야 활용을 위한 기반연구로 천리안 위성과 동일한 채널 특성을 보유한 MTSAT-1R 기상위성을 이용하여 면적강우량을 추정하고 이를 지상관측소를 이용하는 강우보정기법에 적용하며 강우산정 결과를 레이더 및 티센, 크리깅 등과 비교하였다. 강우추정은 NOAA NESDIS의 Power-law 공식을 이용하였으며 지상관측소를 이용한 강우보정은 조건부 합성기법을 적용하였다. 연구대상 유역은 충주댐 유역과 충주댐 유역 상류에 위치한 영월수위표 지점 상류유역을 대상으로 하였으며 레이더 차폐에 따른 레이더 강우량의 감쇄 효과를 분석하고 지형적 특성에 영향 받지 않는 기상위성을 이용한 강우량 산정 기법의 활용성을 제시하였다. 연구결과 레이더 차폐에 영향 받지 않는 영월 수위표 상류유역의 경우 레이더를 이용한 강우량 산정결과와 기상위성을 이용한 결과가 큰 차이가 없으나 전체 유역면적의 절반 정도가 레이더 차폐 지역에 포함되는 충주댐 유역의 경우 레이더를 이용할 경우 20%~35% 가량 강우량이 과소 추정되는 것으로 나타났다. 본 연구를 토대로 산악지형에 의해 레이더 차폐가 발생되는 유역에 대해 기상위성의 활용을 기대할 수 있을 것으로 판단되었다.

• The KIPS Transactions:PartB
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• v.12B no.5 s.101
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• pp.607-616
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• 2005

Due to the limited resources in thin-client and the large amount of computation for decoding MPEG media, it is not easy to support the QoS stream media to clients. To solve the problems, the terminal servers would be charged for decoding the MPEG media and thin-clients have a role to update only the changed areas in their screen. However, these previous approaches cause severely low video quality. In addition, since servers perform all procedures to decode MPEG media, they are easily saturated even under a small number of clients. In this paper, the sources of the low video duality are investigated in the previous thin-clients' solutions working in wireless and wired environments. From the detailed experiments, an intelligent media player is proposed to achieve the QoS streams by supporting both the enhanced video duality and the audio synchronized with video frames.

• The KIPS Transactions:PartB
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• v.14B no.2
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• pp.89-98
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• 2007

For browsing, searching, and manipulating video documents, an indexing technique to describe video contents is required. Until now, the indexing process is mostly carried out by specialists who manually assign a few keywords to the video contents and thereby this work becomes an expensive and time consuming task. Therefore, automatic classification of video content is necessary. We propose a fully automatic and computationally efficient method for analysis and summarization of spots news video for 5 spots news video such as soccer, golf, baseball, basketball and volleyball. First of all, spots news videos are classified as anchor-person Shots, and the other shots are classified as news reports shots. Shot classification is based on image preprocessing and color features of the anchor-person shots. We then use the dominant color of the field and motion features for analysis of sports shots, Finally, sports shots are classified into five genre type. We achieved an overall average classification accuracy of 75% on sports news videos with 241 scenes. Therefore, the proposed method can be further used to search news video for individual sports news and sports highlights.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.11B
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• pp.1005-1012
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• 2008

According to an aging population has dramatically increased in over the world, silver care becomes more important than other field. In this paper, we design and implement an old age patient care system that allows a carer to instantly monitor the status of proteges and notifies emergency of a patient to a medical institute. The system uses RFIDs and infrared sensors implemented in embedded software to analyze the activity and movement detection of the elderly. And the home gateway allows easy integration with heterogeneous devices by employing OSGi that is a middleware standard for home gateways. We can verify the information on the activity per day and the activity per week by Web browsers and view realtime video on the elderly by Web Cam using the implemented system. The system also can send us cell phone messages and E-mail in case of emergency.

• The Journal of the Korea Contents Association
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• v.8 no.11
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• pp.94-102
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• 2008

The development of digital technology constructs meaning through the narrative by digitalized story. Including mobile whole aspect movie, visual contents have the narrative structure and signification based on the digital technology. This study planned to explore the possibility that mobile movie can expand the classical narrative structure and bring up the method of signification. For this purpose, this paper proved the process to cohere narrative through redundancy and a double across of space-time structure according to the principle of causality in mobile movies such as and . According to the findings, mobile movies appeared to construct a consolidated structure through cohesion of meaning and to move the space-time doubly across at a subjective point of view of the characters for continuity of story. Such a result means the narrative structure and the method of signification of mobile movie are modifying or expanding the unique formation of classical films in accordance with mobile devices as digital media.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.11
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• pp.3384-3389
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• 2009

There are two major problems with current National GAP system. One was false in traceability record because it was written or inputted by farmers or distributers and no other measures to check the accuracy was valid. The other was incapability of tracking back and recalling the contaminated agricultural products. For solving these matters, IT convergence model which combined information technology with agricultural experience is elaborated. In IT convergence model, video analytic system classifies every activity depending on the pre-programmed farming process and create the traceability data automatically. Also real time trace system based on USN would solve the problem of tracking back. This system transmits the present location and monitors data of agricultural products from farm to table at all times.

• Journal of Korean Society of Disaster and Security
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• v.10 no.1
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• pp.67-74
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• 2017

Drone technology has been used in various fields including personal hobby, pesticide application and shipping etc. However, only few drone technologies are used in restricted fields such as transportation of alimony goods and utilization of video because of the limited utilization aspect of disaster management field. Especially, disaster specialists' the lack of understanding of the drones seems to increase the difficulty of activating drone technology in disaster management. The theme of the thesis aims to share outline of drones' control method and education plan. This project also analysis the reasons why drone has not been used in disaster management with the fact that drone can be a vital part of emergency management. We propose improved application plan to use drone technology and future development direction in disaster management by deriving problems in terms of institutional aspects(regulation and education) and sensor-based application problems camera, thermal camera, infrared sensor, RFID.