• 한국정보통신학회논문지
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• 제16권6호
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• pp.1204-1208
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• 2012

휴대폰 및 카메라 산업의 급속한 발전에 따라 모든 전자 제품이 소형화, 고성능화, 다양화 추세에 따라 PCB도 고집적화, 다층화, 고사양화가 급속히 이루어지고 있다. 현재 계속해서 진화하고 발전하는 디지털 카메라 그 중에서도 DSLR카메라 이외에 소형, 경량화 하는 고객 요구로 부터 탄생한 미러리스 카메라와 하이브리드 디지털 카메라의 시장이 계속해서 증가하고 있다. 그에 고사양, 저전력, 고성능 부품에 따라 PCB설계 난이도가 점차 증가하고 설계 L/T이 오래 걸리고 있다. 본 논문에서는 디지털 카메라 개발기간 및 제조기간 축소에 적용되는 PCB설계 L/T 단축에 대한 방법을 제안한다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.791-793
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• 2006

In the satellite camera, the incoming light source is converted to electronic analog signals by the electronic component for example CCD (Charge Coupled Device) detectors. The analog signals are amplified, biased and converted into digital signals (pixel data stream) in the video processor (A/Ds). The outputs of the A/Ds are digitally multiplexed and driven out using differential line drivers (two pairs of wires) for cross strap requirement. The MSC (Multi-Spectral Camera) in the KOMPSAT-2 which is a LEO spacecraft will be used to generate observation imagery data in two main channels. The MSC is to obtain data for high-resolution images by converting incoming light from the earth into digital stream of pixel data. The video data outputs are then MUXd, converted to 8 bit bytes, serialized and transmitted to the NUC (Non-Uniformity Correction) module by the Hotlink data transmitter. In this paper, the video data streams, the video data format, and the image data processing routine for satellite camera are described in terms of satellite camera control hardware. The advanced satellite with very high resolution requires faster and more complex image data chain than this algorithm. So, the effective change of the used image data chain and the fast video data transmission method are discussed in this paper

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.372-375
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• 2006

The MSC is a high resolution multi-spectral camera system which is mounted on the KOMPSAT-II satellite. The electro-optic camera system has a refocusing mechanism which can be used in-orbit by ground commands. By adjusting locations of some elements in optics, the system can be focused precisely. The focus mechanism in MSC is implemented with stepper motor and potentiometer. By reading the value of the potentiometer, rough position of the motor can be understood. The exact location of the motor can not be acquired because the information from the potentiometer can not be so accurate. However, before and after certain events of the satellite, like a satellite launch, the direction of the movement or order of the magnitude of the movement can be understood. In this paper, the trend analysis of the focus motor position during the ground test phase is introduced. This result can be used as basic information for the focus calibration after launch. By studying the long term trend, deviation from the best focal point can be understood. The positions of the focus motors after launch are also compared.

• 대한전자공학회논문지SP
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• 제48권3호
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• pp.13-18
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• 2011

본 논문에서는 다시점 색상 카메라와 다시점 깊이 카메라를 이용하여 촬영한 영상의 후처리 방법과 3차원 장면의 깊이 정보를 생성하는 방법을 제안한다. 깊이 카메라는 장면의 깊이 정보를 실시간으로 측정할 수 있는 장점이 있지만, 잡음과 왜곡이 발생하고 색상 영상과의 상관도도 떨어진다. 따라서 다시점 깊이 영상에 후처리 작업을 수행한 후, 이를 다시점 색상 영상과 조합하여 3차원 깊이 정보를 생성한다. 깊이 카메라로부터 얻은 각 시점에서의 초기 변이 정보를 기반으로 한 스테레오 정합의 결과는 기존 방법의 결과 보다 우수한 성능을 나타내었음을 볼 수 있었다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 영호남 합동 학술대회 및 춘계학술대회 논문집 센서 박막 기술교육
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• pp.125-129
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• 2006

The analysis of the depth measurement system with multi-sensors (laser, camera, mirror) has been done and the parameter calibration technique has been proposed. In the proposed depth measurement system, the laser beam is reflected to the object by the rotating mirror and again the position of the laser beam is observed through the same mirror by the camera. The depth of the object pointed by the laser beam is computed depending on the pixel position on the CCD. There involved several number of internal and external parameters such as inter-pixel distance, focal length, position and orientation of the system components in the depth measurement error. In this paper, it is shown through the error sensitivity analysis of the parameters that the most important parameters in the sense of error sources are the angle of the laser beam and the inter pixel distance.

• 대한임베디드공학회논문지
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• 제17권5호
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• pp.273-280
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• 2022

Along with the advancement of deep learning technology, securing high-quality dataset for verification of developed technology is emerging as an important issue, and developing robust deep learning models to the domestic road environment is focused by many research groups. Especially, unlike expressways and automobile-only roads, in the complex city driving environment, various dynamic objects such as motorbikes, electric kickboards, large buses/truck, freight cars, pedestrians, and traffic lights are mixed in city road. In this paper, we built our dataset through multi camera-based processing (collection, refinement, and annotation) including the various objects in the city road and estimated quality and validity of our dataset by using YOLO-based model in object detection. Then, quantitative evaluation of our dataset is performed by comparing with the public dataset and qualitative evaluation of it is performed by comparing with experiment results using open platform. We generated our 2D dataset based on annotation rules of KITTI/COCO dataset, and compared the performance with the public dataset using the evaluation rules of KITTI/COCO dataset. As a result of comparison with public dataset, our dataset shows about 3 to 53% higher performance and thus the effectiveness of our dataset was validated.

• 디지털융복합연구
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• 제15권12호
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• pp.531-541
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• 2017

다면영상을 이용한 실감영상은 스크린이나 다면으로 구성된 디스플레이에서 펼쳐지는 내용이 사실적으로 보여지게 제작되어지고 있다. 이러한 다면영상은 전시를 위한 기획영상에서 주로 사용되었으나 Screen X와 같은 시스템을 통해 영화와 같은 스토리를 전달할 수 있는 포맷으로 재조명 되고 있다. 이번 연구는 3대의 줌렌즈가 장착된 HD급 방송용 디지털 비디오를 이용해 Screen X와 같은 방법으로 인물을 중심으로 한 전경 장면부터 클로즈업 장면까지 촬영한 후 다면 영상 정합보정을 통해 발생되는 문제점을 분석 파악하였다. 촬영 방법과 장비를 보완하면 다면영상이란 포맷이 스토리와 정보 전달이 가능한 매체임을 제시하였고 향후 방송용 줌렌즈를 이용한 촬영보다 표준렌즈 기반의 시네마급 카메라를 이용한 양질의 다면영상 콘텐츠를 제작할 수 있도록 기술적 연구와 보완이 필요하다.

• 제어로봇시스템학회논문지
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• 제21권6호
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• pp.571-576
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• 2015

This paper proposes an auto-parking controller for omnidirectional mobile robots. The controller uses the multi-sensor system including ultrasonic sensor and camera. The several ultrasonic sensors of robot detect the distance between robot and each wall of the parking lot. The camera detects the global position of robot by capturing the image of artificial landmarks. To improve the accuracy of position estimation, we applied the extended Kalman filter with adaptive fuzzy controller. Also we developed the fuzzy control system to reduce the settling time of parking. The experimental results are presented to verify the usefulness of the proposed controller.

• Journal of Astronomy and Space Sciences
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• 제12권1호
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• pp.54-65
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• 1995

We present a design study for a remote sensing camera system which can be operated in multi-channel mode simultaneously with several bandpass filters. The camera control electronics is based on the multiplexed driving concept, which can provide a variety of flexibility for system control parameters and its individual optimisation. The design can also be applied to any system with linear sensors or frame sensors according to its functional requirements. The system design parameters have been examined, including modification of driving waveforms for different types of sensors, waveforms for low-nosie readout circuit in analog chain, and synchronisation with other signal processing.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.432-435
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• 2004

MSC (Multi Spectral Camera) system is a remote sensing payload to obtain high resolution ground image. In this application, uniformity characteristic is important as well as GSD (Ground Resolved Distance) and SNR (Signal to Noise Ratio). MSC image chain is consisted of OM (Optical Module), CCD, Video processor, NUC and DCSU (Data Compression and Storage Unit). Each block makes and corrects MSC's nonuniformity response. This paper shows the cause of nonuniformity error and the correction scheme of MSC system from the electronic point of view.