• Spatial Information Research
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• v.19 no.5
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• pp.87-96
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• 2011

Recently mobile users can access to internet using smart phone at any place and any time, through which they can search and share information. In addition, as the sensors with high-tech functions become cheaper and miniaturized along with the development of MEMS (micro-electo mechanical systems) technology, the extent to utilize smart phone is increasing. Smart phone is equipped with various sensors such as high-resolution camera, GPS, gyroscope and magnetic sensor, which is an appropriate system configuration for remote monitoring research using camera. The remote monitoring system requires camera for video and internet network to send video, for which it has a limitation that it is influenced by the monitoring location. This study is aimed to design and develop the monitoring app. which can be remotely monitored using smart phone technology. The developed monitoring app was designed to take images of ROI (region of interest) within the specified time and to automatically send the images to the server. The developed app. is also possible to be remotely controlled by SMS (short message service). The monitoring proposed in this study can take high-resolution images using CMOS built in the smart phone and send the images and information to the server automatically at any place and any time using 3G and Wi-Fi networks.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11a
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• pp.73-76
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• 2003

모바일 보안 시스템은 웹 카메라에 실시간으로 입력되어지는 객체를 추적한 후, 영상처리를 거쳐, 추적된 객체를 휴대폰으로 전송하는 시스템을 말한다. 본 논문에서는 배경영상과 카메라로부터 입력되는 입력영상과의 차를 이용하여 객체를 추출하고, 추출된 객체를 휴대폰으로 전송한다. 휴대폰은 데이터의 전송속도에서 많은 문제점을 가지고 있기 때문에 객체가 이동했을 경우에만 휴대폰으로 영상을 전송함으로써 트래픽을 최소화하는 방법을 제안한다. 핸드폰은 사용자가 항상 소지하고 있기 때문에, 긴급 상태 발생시 현장의 상황을 실시간 영상을 전송함으로서 사용자가 긴급 상황에 따른 대책을 신속 정확히 할 수 있다.

• Journal of Korean Society for Geospatial Information Science
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• v.20 no.2
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• pp.93-100
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• 2012

The interest in 3-dimensional information and its practical use are rapidly increasing and thus some goods with stereoscopic views are being released. Mobile phones, unlike other units, are being closely utilized in everyday life and their applications are undoubtedly limitless. In this study, taking photographs with the stereo-camera of mobile phones has been accomplished and also the possibility of getting the quantitative information has been examined. In addition, this study aims to evaluate the quantitative practical use of mobile phones, evaluating the accuracy of the obtained quantitative information. Thus, interior orientation parameters were decided through the calibration of the lens of two cameras equipped with mobile phones. Using the determined interior orientation parameters, the 3-dimensional coordinates on the targets of the test field were calculated and then compared with precisely observed coordinates. Moreover, the performance of the orientation on the arbitrary building resulted in the standard deviation of $X={\pm}0.0674m$, $Y={\pm}0.25319$, and $Z={\pm}0.4983m$. The result also shows that the plot is possible. As a result, smart phones could be utilized for the acquisition of the quantitative information at close range and small measurement in which the high-accuracy on the basis of centimeters is not required.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.895-898
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• 2005

최근 미래 컴퓨터 기술에 대한 연구로서, 인터페이스 부분에 초점을 맞춘 다양한 연구가 진행되고 있다. 현재 웨어러블 컴퓨터(Wearable Computer), 유비쿼터스 컴퓨팅(ubiquitous Computing), 가상현실(Virtual Reality), 멀티모달 인터페이스 기술 등 다양한 인터페이스 기술이 연구되고 있다. 본 논문에서는 모바일 폰 카메라를 이용해 손가락 움직임을 인식하는 알고리즘으로 KTF v1.1 Emulator 를 이용하여 모바일 게임을 위한 멀티모달 인터페이스로 적용 가능성을 제안한다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.45 no.2
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• pp.65-73
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• 2008

The characterization process for the accurate color reproduction in mobile phone with camera and LCD is popular. The camera and LCD characterization, gamut mapping process is necessary to map the camera's input color stimulus, CIEXYZ value, into the LCD's output color stimulus. Each characterization is the process estimating the relation between input and output signals. In case of LCD, because of output device, the output color stimulus for the arbitrary input signal can be measured by spectro-radiometer However, in the camera, as the input device, the characterization is an inaccurate and needs the manual works in the process obtaining the output signal because the input signal can not be generated. Moreover, after gamut mapping process, the noise is increased because the optimized gamma tone curve of camera for the noise is distorted by the characterization. Thus, this paper proposed the system of obtaining the output signal of camera and the method of gamma correction for the noise. The camera's output signal is obtained by RGB values of patches from captured the color chart image. However, besides the illumination, the error for the location of the chart in the viewfinder is generated when many camera modules are captured the chart. The method of correcting the position to correct the error from manual works. The position of camera is estimated by captured image. This process and moving of camera is accomplished repeatedly, and the optimized position can be obtained. Moreover, the lightness curve of camera output is corrected partly to reduce the noise from the characterization process.

• The Journal of the Korea Contents Association
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• v.15 no.11
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• pp.18-26
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• 2015

Geometric distortion and shadow effect due to capturing angle could be included in document copy images that are captured by a camera in stead of a scanner. In this paper, a clean black and white document image generation algorithm by distortion correction and shadow elimination based on a camera, is proposed. In order to correct geometric distortion such as straightening un-straight boundary lines occurred by camera lens radial distortion and eliminating outlying area included by camera direction, second derivative filter based document boundary detection method is developed. Black and white images have been generated by adaptive binarization method by eliminating shadow effect. Experimental results of the black and white document image generation algorithm by recovering geometrical distortion and eliminating shadow effect for the document images captured by smart phone camera, shows very good processing results.

• The Optical Journal
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• s.97
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• pp.18-23
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• 2005

젊은층을 중심으로 폰카메라와 더불어 패션 아이콘으로 자리잡은 디지털카메라의 고속성장은 계속되고 있는 가운데 올해는 3~4년전 200만 화소대 이하 제품을 구매했던 소비자들의 교체수요와 맞물려 그 어느때보다 카메라 메이커간 시장 1위 다툼이 치열할 것으로 보인다. 특히 세계적으로 디카 시장이 어느정도 성숙기에 접어들면서 가격경쟁이 심화됨에 따라 결과적으로 메이커들의 수익성 문제로 불거졌고 카메라 사업을 포기하거나 사업구조를 개편하면서 수익성을 확보하려는 메이커들도 생겨나는등 시장 재편의 조짐도 보이고 있다. 이는 국내 시장에도 영향을 미쳐 올해는 그 어느때보다 메이커간 치열한 공방전과 국내 시장의 지각변동이 예상되고 있다.

• 정보화사회
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• s.176
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• pp.42-45
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• 2005

메가픽셀폰 시장석권에 나서고 있는 국내 업체들의 행보가 눈부시다. 현재 카메라폰 화소수 경쟁은 지난해 삼성전자와 LG전자, 팬택계열 등이 200만 화소폰과 300만 화소폰을 잇따라 출시하면서부터 본격화되더니 지난해말 삼성전자가 500만화소폰을 전격 선보이면서 잠시 숨고르기에 들어가는 모습이었다. 그러던 것이 올 7월 삼성전자가 700만 화소라는 초고화소폰으로 세계를 놀라게 한데 이어 LG전자도 신개념 500만 화소폰을 내놓으며 경쟁의 끈을 이어가는 양상이다.

• Journal of Broadcast Engineering
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• v.24 no.2
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• pp.281-291
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• 2019

Depth from defocus estimates the 3D depth by using a phenomenon in which the object in the focal plane of the camera forms a clear image but the object away from the focal plane produces a blurred image. In this paper, algorithms are studied to estimate 3D depth by analyzing the degree of blur of the image taken with a single camera. The optimized object range was obtained by 3D depth estimation derived from depth from defocus using one image of a single camera or two images of different focus of a single camera. For depth estimation using one image, the best performance was achieved using a focal length of 250 mm for both smartphone and DSLR cameras. The depth estimation using two images showed the best 3D depth estimation range when the focal length was set to 150 mm and 250 mm for smartphone camera images and 200 mm and 300 mm for DSLR camera images.

• The Optical Journal
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• s.86
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• pp.76-81
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• 2003