• 한국인터넷방송통신학회논문지
• /
• 제22권5호
• /
• pp.93-97
• /
• 2022

적외선 영상은 온도 정보뿐만 아니라 파장 정보를 포함하고 있으며 이는 단일 파장의 적외선 카메라로는 분석이 불가능하다. 다중 파장 적외선 카메라는 적외선 영상에 포함된 광범위한 정보를 획득할 수 있다. 다중 파장 적외선 카메라의 한 종류인 이중대역 적외선 카메라는 시스템 구성을 쉽게 할 수 있다는 이점이 있다. 이중대역 적외선 카메라는 적외선 영상에 포함된 온도정보 뿐만 아니라 파장 정보를 획득할 수 있고 이를 통해 적외선 카메라의 탐지/식별 성능을 향상시킬 수 있다. 본 논문에서는 중적외선 대역과 원적외선 대역을 동시에 획득할 수 있는 이중대역 적외선 검출기를 이용한 적외선 카메라의 설계에 대하여 기술한다.

• Journal of information and communication convergence engineering
• /
• 제12권4호
• /
• pp.246-251
• /
• 2014

The recent rise of the three-dimensional television (3DTV) industry has led to a wide exploitation of the dual-lens stereoscopic camera. However, when the zoom-in function is used, it is possible that a camera object is magnified only with a fixed convergence point, thereby leading to visual discomfort. In this paper, we propose several methods based on which a convergence point can be adjusted to prevent visual discomfort during zoom-in for a dual-lens stereoscopic camera. Further, we produce 3D contents by applying the proposed methods to certain cases and at certain distances and conduct a subjective evaluation. On the subjective evaluation, 48 subjects watch the 3D contents created by the proposed methods and score the stages of the visual comfort. The result of the subjective evaluation shows that some of the proposed methods are more efficient than the others. We hope that these proposed high-efficiency methods can be applied to produce a dual-lens stereoscopic camera that allows convenient stereoscopic photography.

• 제어로봇시스템학회논문지
• /
• 제18권7호
• /
• pp.650-657
• /
• 2012

An effective dual-mode camera system(a passive wide-angle camera and a pan-tilt-zoom camera) is proposed in order to improve the performance of visual surveillance. The fixed wide-angle camera is used to monitor large open areas, but the moving objects on the images are too small to view in detail. And, the PTZ camera is capable of increasing the monitoring area and enhancing the image quality by tracking and zooming in on a specific moving target. However, its FOV (Field of View) is limited when zooming in on a specific target. Therefore, the cooperation of wide-angle and PTZ cameras is complementary. In this paper, we propose an automatic initial set-up algorithm and coordinate transform method from the wide-angle camera coordinate to the PTZ one, which are necessary to achieve the cooperation. The automatic initial set-up algorithm is able to synchronize the views of two cameras. When a moving object appears on the image plane of a wide-angle camera after the initial set-up positioning, the obtained values of the wide-angle camera should be transformed to the PTZ values based on the coordinate transform method. We also develope the PTZ control method. Various in-door and out-door experiments show that the proposed dual-camera system is feasible for the effective visual surveillance.

• Journal of Radiation Protection and Research
• /
• 제37권4호
• /
• pp.191-196
• /
• 2012

한양대학교에서는 핵물질 탐지를 위해 고에너지 감마선원 영상화에 적합한 이중산란형 컴프턴 카메라의 원형을 개발하였다. 이중산란형 컴프턴 카메라는 높은 영상해상도를 제공하지만, 기존의 단일산란형 컴프턴 카메라보다 상대적으로 영상감도가 낮다는 한계가 있다. 이에 본 연구에서는 개발된 이중산란형 컴프턴 카메라에 단일산란형 컴프턴 카메라의 기능을 추가함으로써 하나의 시스템에서 두 가지 모드로 작동하는 이중모드 컴프턴 카메라(고민감도(단일산란형)모드와 고해상도(이중산란형)모드)에 대한 개념설계와 이에 대한 최적화 설계를 수행하였다. 최적화된 시스템에서 고민감도 모드는 고해상도 모드에 비해 전 에너지 영역에서 약 100배 정도 높은 고유영상감도를 제공하는 것으로 평가되었으며, 고해상도 모드에서 영상해상도는 기존의 이중산란형 컴프턴 카메라와 거의 같은 결과를 보여 고해상도 영상을 제공하는 것으로 나타났다.

• 한국정보통신학회논문지
• /
• 제17권6호
• /
• pp.1383-1388
• /
• 2013

이안식 일체형 입체카메라는 줌인시 고정된 컨버전스포인트로 인해 촬영된 영상 시청시에 어지러움을 유발하는 시각적 불편이 발생할 수 있다. 본 논문에서는 이안식 일체형 입체카메라에서 줌인시 발생되는 시각적 불편을 방지하기 위해 컨버전스 포인트를 조정하는 기법을 제시한다. 포커스, 피사체 및 컨버전스포인트의 위치에 따른 관계모델을 제시하고 각각에 따라 컨버전스포인트를 조정하여 시각적 불편을 최소화하는 기법을 제안한다. 또한 제안한 기법을 실제로 구현하여 제시한 방법의 우수성을 입증한다.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2013년도 춘계학술대회
• /
• pp.456-459
• /
• 2013

이안식 일체형 입체카메라는 줌인시 고정된 컨버전스포인트로 인해 촬영된 영상 시청시에 어지러움을 유발하는 시각적 불편이 발생할 수 있다. 본 논문에서는 이안식 일체형 입체카메라에서 줌인시 발생되는 시각적 불편을 방지하기 위해 컨버전스 포인트를 조정하는 기법을 제시한다. 포커스, 피사체 및 컨버전스포인트의 위치에 따른 관계모델을 제시하고 각각에 따라 컨버전스포인트를 조정하여 시각적 불편을 최소화하는 기법을 제안한다. 또한 제안한 기법을 실제로 구현하여 제시한 방법의 우수성을 입증한다.

• 한국군사과학기술학회지
• /
• 제9권3호
• /
• pp.5-11
• /
• 2006

This paper is launched to get an exact bore-sighting value in the process of assembling for a dual-barrel weapon. Image processing method with a CCD(Charged Coupled Device) camera is chosen for the error reduction of bore-sighting. The results of this method by using a CCD camera and the testing target method are described in this paper. After the performance of the dual-barrel weapon and that of the fire-control system in the dual barrel weapon system is confirmed, the bore-sighting which is a part of the process in the system assembly is accomplished. In this process, the position of the barrel is identified by using the testing target method that is an existing bore-sighting method. Then, the fixing line of the fire-control system is checked by a day-optical part. The precision of the bore-sighting is required within several mils, however the manual method using the naked eyes makes it worse. Therefore, a CCD camera is installed in the eyepieces. Next, we can get an image of the sighting and the center coordinate values of the laser-pointer from each barrel by image processing method. A required bore-sighting value is calculated from the eccentricity of the center coordinate. Finally, It can be applied to adopt this result in the assembling process of the dual-barrel weapon.

• 자동차안전학회지
• /
• 제14권2호
• /
• pp.57-69
• /
• 2022

Recently, as interest in self-driving cars has increased worldwide, research and development on the Advanced Driver Assist System is actively underway. Among them, the purpose of Adaptive Cruise Control (ACC) is to minimize the driver's driving fatigue through the control of the vehicle's longitudinal speed and relative distance. In this study, for the research of the ACC test in the real environment, the real-road test was conducted based on domestic-road test scenario proposed in preceding study, considering ISO 15622 test method. In this case, the distance measurement method using the dual camera was verified by comparing and analyzing the result of using the dual camera and the result of using the measurement equipment. As a result of the comparison, two results could be derived. First, the relative distance after stabilizing the ACC was compared. As a result of the comparison, it was found that the minimum error rate was 0.251% in the first test of scenario 8 and the maximum error rate was 4.202% in the third test of scenario 9. Second, the result of the same time was compared. As a result of the comparison, it was found that the minimum error rate was 0.000% in the second test of scenario 10 and the maximum error rate was 9.945% in the second test of scenario 1. However, the average error rate for all scenarios was within 3%. It was determined that the representative cause of the maximum error occurred in the dual camera installed in the test vehicle. There were problems such as shaking caused by road surface vibration and air resistance during driving, changes in ambient brightness, and the process of focusing the video. Accordingly, it was determined that the result of calculating the distance to the preceding vehicle in the image where the problem occurred was incorrect. In the development stage of ADAS such as ACC, it is judged that only dual cameras can reduce the cost burden according to the above derivation of test results.

• 대한방사성의약품학회지
• /
• 제3권1호
• /
• pp.25-31
• /
• 2017

Liposomes are defined as spherical, self-closed structures formed by lipid bilayers containing aqueous phase. Most liposomes are composed of various amphipathic lipids such as phospholipids and cholesterol. We used amphipathic lipids (DPPC, DPPG) as liposome components and prepared around 100 nm liposomes by standard extrusion method. Nuclear/MR dual imaging agents based on liposome platform were prepared by adding radioactive $^{131}I$-HIB (hexadecyl-4-tributylstannylbenzoate) and Gd-DTPA into liposome bilayer and inside liposome, respectively. Gamma camera and MR imaging both showed signal increases in liver.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
• /
• pp.417-420
• /
• 2003

Most Embedded Web Camera Server products currently deployed on the market adopt JPEG for compression of video data continuously acquired from the cameras. However, JPEG does not efficiently compress the continuous video stream, and is not appropriate for the Internet where the transmission bandwidth is not guaranteed. In our previous work, we presented the result of designing and implementing an embedded web camera streaming server using MPEG4 codec. But the server in our previous work did not show good performance since one CPU had to both compress and process the network transmission. In this paper, we present our efforts to improve our previous result by using dual CPUs, where DSP is employed for data compression and StrongARM is used for network processing. Better performance has been observed, but it is found that still more time is needed to optimize the performance.