• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.71-75
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• 2009

In this paper, we present a real-time method to detect moving objects in a rotating and zooming camera. It is useful for camera surveillance of fixed but rotating camera, camera on moving car, and so on. We first compensate the global motion, and then exploit the displaced frame difference (DFD) to find the block-wise boundary. For robust detection, we propose a kind of image to combine the detections from consecutive frames. We use the block-wise detection to achieve the real-time speed, except the pixel-wise DFD. In addition, a fast block-matching algorithm is proposed to obtain local motions and then global affine motion. In the experimental results, we demonstrate that our proposed algorithm can handle the real-time detection of common object, small object, multiple objects, the objects in low-contrast environment, and the object in zooming camera.

• 한국정보통신학회논문지
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• 제18권8호
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• pp.1869-1876
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• 2014

자동차 후방카메라 시스템은 후진시 차량 후방을 모니터 영상으로 보여주어 인명보호와 주차의 편리, 운전자의 안전 운전을 위한 다양한 서비스를 제공한다. 본 논문에서는 우리나라가 독자 개발한 개인용 무선통신 Binary CDMA 신기술을 이용하여 설치가 자유롭고 설치비용과 기술료를 절감할 수 있는 자동차 후방카메라 시스템의 개발방법 및 설계에 관해 연구하였다.

• 대한원격탐사학회지
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• 제30권3호
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• pp.383-397
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• 2014

Information technology advances are allowing conventional surveillance systems to be combined with mobile communication technologies, creating ubiquitous monitoring systems. This paper proposes monitoring system that uses smart camera technology. We discuss the dependence of interior orientation parameters on calibration target sheets and compare the accuracy of a three-dimensional monitoring system with camera location calculated by space resectioning using a Digital Surface Model (DSM) generated from stereo images. A monitoring housing is designed to protect a camera from various weather conditions and to provide the camera for power generated from solar panel. A smart camera is installed in the monitoring housing. The smart camera is operated and controlled through an Android application. At last the accuracy of a three-dimensional monitoring system is evaluated using a DSM. The proposed system was then tested against a DSM created from ground control points determined by Global Positioning Systems (GPSs) and light detection and ranging data. The standard deviation of the differences between DSMs are less than 0.12 m. Therefore the monitoring system is appropriate for extracting the information of objects' position and deformation as well as monitoring them. Through incorporation of components, such as camera housing, a solar power supply, the smart camera the system can be used as a ubiquitous monitoring system.

• Journal of information and communication convergence engineering
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• 제11권3호
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• pp.216-222
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• 2013

It is known that blood circulation in human body causes the skin tone to change concurrently with heartbeats. A number of apps have been developed to measure the heartbeat using smartphone camera; however, no any further analysis is performed. In this paper we propose an algorithm that detects heartbeats from the phone's camera and further extracts the heart rate variability (HRV). We compare the HRV extracted from the camera with the HRV extracted from the electrocardiogram. We estimated a number of commonly used HRV characteristics and compared them. Our results show that smartphone camera leads to slightly overestimated characteristics although the difference in extracted HRV signals is negligible. As a consequence we suggest that a smartphone camera can be employed in a quick heart diagnosis and diagnosis of autonomic nervous system.

• 한국생산제조학회지
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• 제24권6호
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• pp.605-612
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• 2015

Three dimensional (3D) position determination and motion recognition using a 3D depth sensor camera are applied to a developed penguin-shaped robot, and its validity and closeness are investigated. The robot is equipped with an Asus Xtion Pro Live as a 3D depth camera, and a sound module. Using the skeleton information from the motion recognition data extracted from the camera, the robot is controlled so as to follow the typical three mode-reactions formed by the operator's gestures. In this study, the extraction of skeleton joint information using the 3D depth camera is introduced, and the tracking performance of the operator's motions is explained.

• 한국환경복원기술학회지
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• 제17권3호
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• pp.65-74
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• 2014

The aim of this study was to evaluate the monitoring efficiency of camera trapping in wild animals and to determine ways to increase its utilization. Nineteen sensor cameras were installed in Sobaeksan National Park from October 2012 to September 2013. During the study period, a total of 1045 terrestrial mammal photos were secured and 15 species habitats were identified. Shooting frequency was higher for medium and large mammals, especially full images of carnivores accounted for approximately 83%. A comparison of track surveys revealed that camera trapping was highly efficient and helped in capturing real image of species. The supply of lure and bait stimulates the sense of smell in carnivores, which further enhances the capturing of images by camera trapping. The results of this study provide data on the ecological characteristics of mammals, which can aid in determining habitat use by these animals, and thereby facilitate prevention of crop damage by wildlife.

• 반도체디스플레이기술학회지
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• 제15권4호
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• pp.1-9
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• 2016

The warpage on mobile phone camera packages occurs due to the CTE(Coefficient of Thermal Expansion) mismatch between a thin silicon die and a substrate. The warpage in the optical instruments such as camera module has an effect on the field curvature, which is one of the factors degrading the optical performance and the product yield. In this paper, we studied the effect of die bonding epoxy on the package and optical performance of mobile phone camera packages. We calculated the warpages of camera module packages by using a finite element analysis, and their shapes were in good agreement showing parabolic curvature. We also measured the warpages and through-focus MTF of camera module specimens with experiments. The warpage was improved on an epoxy with low elastic modulus at both finite element analysis and experiment results, and the MTF performance increased accordingly. The results show that die bonding epoxy affects the warpage generated on the image sensor during the packaging process, and this warpage eventually affects the optical performance associated with the field curvature.

• 한국정보통신학회논문지
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• 제19권10호
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• pp.2292-2300
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• 2015

자동차 후방카메라 시스템은 후진시 차량 후방을 모니터 영상으로 보여주어 안전 운전과 주차 편리를 위한 서비스를 제공한다. 본 논문에서는 우리나라가 개발한 개인용 무선통신 Binary CDMA 신기술을 이용하여 유선의 제약없이 설치가 자유롭고 설치비용을 절감할 수 있는 자동차 후방카메라 시스템의 구현방법 및 기술에 관해 연구하였다. 본 연구를 통해 시제품을 제작하였고, 무선영상 전송기와 중계기의 카메라 입력 및 모니터 출력, Bianry CDMA를 이용한 무선 통신, 영상전송기와 중계기 응용프로그램의 핵심 구현에 대해 연구하였다.

• 한국정보통신학회논문지
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• 제18권7호
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• pp.1571-1578
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• 2014

Binary CDMA는 음성 영상 등의 멀티미디어 데이터를 초고속으로 우수한 전송품질로 통신할 수 있는 우리나라가 개발한 새로운 표준 무선통신 기술이다. 본 논문에서는 유선의 제약 없이 자유롭게 설치 가능한 차량용 무선 카메라 시스템의 개발을 위해 이의 핵심 장치인 Binary CDMA 무선 영상전송기와 중계기의 설계와 구현에 관해 연구하였다.

• 한국인터넷방송통신학회논문지
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• 제21권6호
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• pp.1-8
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• 2021

몰카범죄의 증가에 발맞추어 은닉형 카메라는 스마트폰의 기술발전 속도에 따라 소형화 및 기술 집적이 고도화되어 성능이 날로 발전하고 있다. 이러한 외적인 네트워킹 컴퓨팅 환경이 고도화 되고, 활동이 많은 현대인의 생활양상이 다양화됨에 따라 일반 안전용 카메라외에 은닉형 카메라에 노출 또한 증가되고 있는 추세이다. 반면 은닉형 카메라를 탐지하고 예방하기 위한 기술은 이러한 은닉형 카메라 기술발전과 속도를 따라가지 못하고 있는 실정이다. 이에 본 연구에서는 일반영상과 열화상 이미지 합성기술을 바탕으로 적외선 열 방식의 탐지기술을 이용하여 은닉카메라의 발열을 감지하고, 주변 온도 차이에 따른 각 파장의 반사율을 분석하여 오탐율도 줄이도록 하였다.