• The Optical Journal
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• s.129
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• pp.65-69
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• 2010

렌즈들의 고유한 초점거리는 모두 대각선 방향의 화각을 표시한 것으로 화각은 말 그대로 화면을 담을 수 있는 각도를 말한다. 화각이 제일 넓은 렌즈는 물고기가 바라보는 것과 같다고 해서 붙여진 어안렌즈를 비롯하여 광각렌즈, 망원렌즈 등이 있다. 이번호에서는 표준렌즈, 망원렌즈, 광각렌즈 등을 통해 초점 거리별 렌즈의 활용법을 알아보자.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.3
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• pp.597-602
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• 2013

In this paper, the lens module of mega pixel type was designed for barrel distortion calibration due to the barrel distortion of ultra wide angle. And the performance of this camera module was improved with the images from wide dynamic range 2 megapixel CMOS image sensor.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.26 no.2
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• pp.103-110
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• 2008

General lens, widely using in Photogrammetry, has narrow view, and have to adjust "Image-Registration Method" after obtain images and it need cost; economic, period of time. Recent days, there is various study that use wide-angle lens, usually for robotics field, put to practical use in photogrammetry instead of general lens. In this studies, distortion tendency of wide-angle lens and utilize the correction techniques suitable to wide-angle lens by the existing photographic survey methods. After carrying out the calibration of the wide-angle lens, we calculated the correction parameters, and then developed the method that convert the original image-point to new image-point correcting distortion. For authorization the developed algorithm, we had inspection about shape and position; there are approximately 2D RMSE of 3 pixel, cx = 2, and cy = 3 different.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.5
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• pp.999-1004
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• 2012

In this paper, camera modules and lens's images were analyzed for the compensation of distortion image by wide angle lens based WDR(Wide Dynamic Range) with high resolution sensor(2-Mega CMOS Image sensor). Due to wide angle ($176^{\circ}$) of designed wide angle camera modules, the compensation result of distorted image was analyzed, and the application of these modules was proposed for smart NUX(Natural User eXprience).

• Proceedings of the Korean Information Science Society Conference
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• 2002.10d
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• pp.595-597
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• 2002

본 논문에서는 광각렌즈를 장착한 CCD 카메라를 통하여 실시간으로 입력되는 영상 데이터로부터 블록에 기반을 둔 영상처리 방법을 사용하여 움직임 정보를 추출한 후, 펜틸트줌 기능을 갖고 있는 카메라를 이용하여 이동하는 물체를 추적해 가는 실시간 이동물체 추적 시스템을 제안한다. 본 시스템은 입력되는 전체 영상 화면을 여러 개의 블록으로 나누어 처리함으로써 보다 빠른 연산 속도를 보이면서도 잡영에도 강하다는 특성을 가진다.

• Korean Journal of Optics and Photonics
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• v.23 no.5
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• pp.179-188
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• 2012

Lenses with an ultra wide angle of view are usually called fisheye lenses since a fish can see an ultra wide panoramic view under water. As the angle of view for these kinds of lenses reaches a wide angle, the illumination on an image sensor is reduced by a rapid drop. In this paper, we discuss the causes and the ways to correct for a rapid drop. First, it is treated for the sign convention of directional cosine vectors and normal vectors on the curved surface by means of analytic geometry. And, from the fundamental discussion for these vectors, the rapid illumination drop is numerically analyzed for various kinds of causes by utilizing geometrical optics and radiometry as well as Fresnel equations derived from electromagnetic boundary conditions. As a result, we are able to get the full understanding for the rapid illumination drop and to propose ways to correct effects due to an wide angle of view.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.5
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• pp.500-506
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• 2002

This paper presents a design of wide angle steering microstrip Rotman lens operating over broadband frequency range for Electronic Warfare equipments. It has a compact and simple structure which it is easy to manufacture repetitively. The lens is modelled as a 2-dimension planar circuit, the contour integral method is performed over entire lens contour and the transmission coefficients from 8 beam ports to 8 array ports are found. The measured results are well agreed with those of analysis. Prediction of the multibeam array pattern fed by linear array antenna shows $\pm$65$^{\circ}$ of beam steering and $\pm$5 dB insertion loss deviation over 3:1 frequency range.

• The Optical Journal
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• s.125
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• pp.32-34
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• 2010

렌즈 하나로 광각부터 망원, 게다가 마크로까지 촬영할 수 있는 만능 렌즈가 고배율 줌의 장점이다. 본 고는 광기술컨텍트 2009년 9월호 특집인 최근의 렌즈 설계 동향에서 주식회사 Tamron 광학개발본부의 SAKURABA Shogo씨가 기고한 <최근의 고배율 줌렌즈의 특징>을 번역한 것이다. 일안 리플렉스 카메라의 고배율 줌렌즈의 선구자라 불리는 Tamron의 개발 역사와 광학설계기술의 트랜드에 대해서 소개했다.

• The Optical Journal
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• s.169
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• pp.29-32
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• 2017

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.22 no.2
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• pp.127-135
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• 2004

The calibration of lens to be used and the planning of photographing planning layout is very important to achieve the requested accuracy in the precision measurement by close-range photogrammetry. Establishment of absolute coordinate system is regarded as another important factor for the purpose of measuring absolute deformation of photogrammetric object. In this study, the following tasks were performed : (1) calibration of super-wide-angle lens or focal length 21mm fer close-range photographing used by 35mm metric camera, (2) development of the measuring system for monitoring of absolute deformation through periodic observation of small area, and, (3) application of this system to monitor the absolute deformation of surface of underwater structure in fixed cycle and to present the efficiency of the system.