• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.2
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• pp.330-336
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• 2007

A single pixel photon counting type image sensor which is applicable for medical diagnosis with digitally obtained image and industrial purpose has tern designed with $0.18{\mu}m$ triple-well CMOS process. The designed single pixel for readout chip is able to be operated by single supply voltage to simplify digital X-ray image sensor module and a preamplifier which is consist of folded cascode CMOS operational amplifier has been designed to enlarge signal voltage(${\Delta}Vs$), the output voltage of preamplifier. And an externally tunable threshold voltage generator circuit which generates threshold voltage in the readout chip has been newly proposed against the conventional external threshold voltage supply. In addition, A dark current compensation circuit for reducing dark current noise from photo diode is proposed and 15bit LFSR(Linear Feedback Shift Resister) Counter which is able to have high counting frequency and small layout area is designed.

• Korean Journal of Digital Imaging in Medicine
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• v.12 no.2
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• pp.145-150
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• 2010

Thick films of carbon fiber were prepared by a heating element of plan shape made in Darin co., We have investigated surface morphology of the specimen depending on heat-treatment temperatures. Scanning electron microscope(SEM) image of carbon fiber thick films of the specimen heat treated shows a grain growth at $1200^{\circ}C$ and becomes a poly-crystallization at $1350^{\circ}C$. The variation of resistivity at the thermally annealed specimen above $600^{\circ}C$ depends on type of the substrates. It may be due to a variation of film thickness and a difference of interfacial phenomena. A heating element of features was affected significantly by skin blood and quantity of heat of the body physiological function. After radiation of farinfrared for plate heating element, the function of biometric physiological is considered of skin blood flow and calorie which greatly affects on individuals. Electromagnetic wave was not influence on the body.

• Korean Journal of Digital Imaging in Medicine
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• v.11 no.2
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• pp.109-114
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• 2009

Carried out an experiment for quantitative evaluation about intraoral sensor among oral dental imaging equipments in PACS environment. For evaluation, testing environment & evaluation criteria are established that refer to the 'IEC 62220-1-2' and experimented with set up the standard radiation penetration that correspond with RQA-3(IEC 61267). Results of experiments using the image J, derived the ESF(edge spread function), LSF (line spread function) and calculated the MTF(modulation transfer function) finally. As a result, the MTF that 0.1, 0.2sec are 10% about 10 lp/mm and 0.32 sec is the 10% about 9 lp/mm in level represents the value of the MTF. Change of scan condition in dental environmental, according to the MTF value taken note that no changes can be seen enough. However, the dimensions of each other size $1(1200{\times}1600)$, size $2(1440{\times}1920)$ intraoral sensors for 3 lp/mm, respectively 40%, 90% of the note might have been the difference between the value of MTF, in accordance with standard sensors might note differences could be observed.

• Journal of Digital Contents Society
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• v.10 no.2
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• pp.319-326
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• 2009

In this paper, we present an algorithm which recognize hand shape in real time using only image without adhering separate sensor. Hand recognizes using edge orientation histogram, which comes under a constant quantity of 2D appearances because hand shape is intricate. This method suit hand pose recognition in real time because it extracts hand space accurately, has little computation quantity, and is less sensitive to lighting change using color information in complicated background. Method which reduces recognition error using principal component analysis(PCA) method to can recognize through hand shape presentation direction change is explained. A case that hand shape changes by turning 3D also by using this method is possible to recognize. Human interface system manufacture technique, which controls a home electric appliance or game using, suggested method at experience could be applied.

• Proceedings of the Korean Society of Computer Information Conference
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• 2008.06a
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• pp.237-241
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• 2008

현재 글로벌화에 따른 과일 소비성향이 다종화, 고급화를 추구하고 있으며 국내 생산과일의 생존은 고급화에 의한 맛에 대한 경쟁력 재고가 필요하다. 과일을 맛과 크기에 따라 등급을 세분화 한 차별화된 마케팅이 요구되므로 수익과 생산성 증대를 위하여 개별농가에서의 대략적, 영세적인 선별에서부터 탈피한 체계적이고 규모화된 자동화 생산과정이 필요하다. 그러나 현재 사용되고 있는 선과기는 회전 드럼식 방식으로 크기 등급을 선별할 때 과실의 손상을 야기하고 당도측정을 위해 사용되는 광센서는 1억원에 달하는 선별장비 비용을 초래하므로 본 논문에서는 디지털이미지를 이용하여 과일의 크기를 측정하여 등급을판정하고 당도 측정 또한 과실의 파손없이 분류하는 과일 선별 시스템을 제작한다.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.43 no.3 s.309
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• pp.51-59
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• 2006

In this paper, we propose an excellent ultrasonic transceiver system based on a QPSK modulation technique for underwater communication. The transmitter sends a still image at the level of 187dB re $1{\mu}Pa/V@1m$ through a power amplifier by driving an ultrasonic sensor. The receiver performs digital conversion at the 100kHz sampling frequency, demodulation and decoding process for the image sent from the transmitter through the underwater communication. We have shown that the processed image at the receiver is almost the same as the orignal one. The maximum detection distance of the system proposed in this paper is approximately 1.17km. To cope with the difficulties of transmission loss, this paper proposes, implements and analyzes important parameters of sensors and circuits used in the system. Most of the underwater communication has focused on the transmission of audio signal, but this paper suggests an efficient underwater communication system for still image transmission.

• Spatial Information Research
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• v.23 no.3
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• pp.91-100
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• 2015

We developed a micro UAV based rapid mapping system that provides geospatial information of target areas in a rapid and automatic way. Users can operate the system easily although they are inexperienced in UAV operation and photogrammetric processes. For the aerial data acquisition, we constructed a micro UAV system mounted with a digital camera, a GPS/IMU, and a control board for the sensor integration and synchronization. We also developed a flight planning software and data processing software for the generation of geo-spatial information. The processing software operates automatically with a high speed to perform data quality control, image matching, georeferencing, and orthoimage generation. With the system, we have generated individual ortho-images within 30 minutes from 57 images of 3cm resolution acquired from a target area of $400m{\times}300m$.

• Spatial Information Research
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• v.17 no.2
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• pp.191-200
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• 2009

Aerial digital camera was used in outside since 2000 because of technical development & improvement of it. In korea, line type or frame type digital camera introduced since 2006 was used in manufacture and Correction of National base map appling the number and distribution of control point of analogue aerial triangulation from 2008. The main objective of the study is to compare and analyze the effects of the number and distribution of control points in accuracy of results, when we execute aerial triangulation with images from ADS40, line type sensored aerial digital camera available in korea. The result of RMSE can be concluded that accuracy of all the case are meet the aerial photograph surveying work regulation of NGI as to horizontal of control point ${\pm}0.068m$, ${\pm}0.073m$, ${\pm}0.071m$, height ${\pm}0.041m$, ${\pm}0.055m$, ${\pm}0.055m$, ${\pm}0.041m$, as to horizontal of check point ${\pm}0.167m$, ${\pm}0.113m$, ${\pm}0.110m$, height ${\pm}0.128m$, ${\pm}0.086m$, ${\pm}0.081m$. We have confirmed that it is possible to make out large scale digital topographic map.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2006.05a
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• pp.193-198
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• 2006

최근의 동남아시아 발생한 지진해일(쓰나미)과 미국 뉴올리언즈 지역의 허리케인으로 등의 재난으로 인해 막대한 인명과 경제적 피해가 전 세계적으로 빈번히 발생하고 있다. 우리나라도 폭설과 태풍, 산불로 인한 피해가 해마다 증가하고 있는 실정이다. 본 연구에서는 '05년 양양지역의 대규모 산불재해지역을 중심으로 항공레이저측량, GPS/INS항공사진측량 등의 다중센서를 이용하여 GSIS자료를 취득하였다 이를 통해 수치지형도, 수치고도모형, 수치외관모형, 디지털 영상, 근적외선 영상을 처리하였으며, 과거 항공사진자료와의 비교 분석을 통해 정확한 피해면적과 피해량, 향후 산사태가 발생할 수 있는 지역 예측 및 식생에 대한 피해정도와 회생가능성을 분석하였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.11a
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• pp.170-171
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• 2017

최근 디지털 사이니지 시장은 정방형 디스플레이로 콘텐츠를 표출하던 초기와 달리 다양한 형태와 크기를 가진 비정형 사이니지를 배치하여 표출하는 기술에 관심이 높아지고 있다. 본 논문에서는 디스플레이의 회전에 따라 변하는 비정형 사이니지 시스템의 구조를 제시한다. 자이로 센서의 출력 값을 입력으로 받아 기울어진 각도를 계산하고, 극좌표계의 특성을 이용하여 회전 각도에 따라 네 꼭짓점의 위치가 가변되는 영상을 영상좌표계로 변환하여 회전형 디스플레이 사이니지로 표출할 수 있다.