• Title/Summary/Keyword: camera lens

Search Result 644, Processing Time 0.027 seconds

Development of camera caliberation technique using neural-network (신경회로망을 이용함 카메라 보정기법 개발)

  • 한성현;왕한홍;장영희
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1997.10a
    • /
    • pp.1617-1620
    • /
    • 1997
  • This paper describes the camera caliberation based-neural network with a camera modeling that accounts for major sources of camera distortion, namely, radial, decentering, and thin prism distortion. Radial distoriton causes an inward or outward displacement of a given image point from its ideal location. Actual optical systems are subject to various degrees of decentering, that is the optical centers of lens elements are not strictly collinear. Thin prism distortion arises from imperfection in lens design and manufacturing as well as camera assembly. It is our purpose to develop the vision system for the pattern recognition and the automatic test of parts and to apply the line of manufacturing. The performance of proposed camera aclibration is illustrated by simulation and experiment.

  • PDF

Development of Camera Calibration Technique Using Neural-Network (뉴럴네트워크를 이용한 카메라 보정기법 개발)

  • 장영희
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 1997.10a
    • /
    • pp.225-229
    • /
    • 1997
  • This paper describes the camera calibration based-neural network with a camera modeling that accounts for major sources of camera distortion, namely, radial, decentering, and thin prism distortion. Radial distortion causes and inward or outward displacement of a given image point from its ideal location. Actual optical systems are subject to various degrees of decentering, that is, the optical centers of lens elements are not strictly collinear. Thin prism distortion arises from imperfection in lens design and manufacturing as well as camera assembly. It is our purpose to develop the vision system for the pattern recognition and the automatic test of parts and to apply the line of manufacturing. The performance of proposed camera calibration is illustrated by simulation and experiment.

  • PDF

A Compensation for Distortion of Stereo-scopic Camera Image Using Neuro-Fuzzy Inference System (뉴로-퍼지 추론시스템을 이용한 입체 영상 카메라의 왜곡 영상 보정)

  • Seo, Han-Seog;Yim, Wha-Young
    • The Journal of the Korea institute of electronic communication sciences
    • /
    • v.5 no.3
    • /
    • pp.262-268
    • /
    • 2010
  • In this paper, this study restores the distorted image to its original image by compensating for the distortion of image from a fixed-focus camera lens. The various developments and applications of the imaging devices and the image sensors used in a wide range of industries and expanded use, but due to the needs of the small size and light weight of the camera, the distortion from acquiring images of the distorted curvature of the lens tends to affect many. In particular, the three-dimensional imaging camera, each different distortion of left and right lens cause the degradation of three-dimensional sensitivity and left-right image distortion ratio. we approached the way of generalizing the approximate equations to restore each part of left-right camera images to the coordinators of the original images. The adaptive Neuro-Fuzzy Inference System is configured for it. This system is divided from each membership function and is inferred by 1st order Sugeno Fuzzy model. The result is that the compensated images close to the left, right original images. Using low-cost and compact imaging lens by which also determine the exact three-dimensional image-sensing capabilities and will be able to expect from this study.

Geometric Correction of Vehicle Fish-eye Lens Images (차량용 어안렌즈영상의 기하학적 왜곡 보정)

  • Kim, Sung-Hee;Cho, Young-Ju;Son, Jin-Woo;Lee, Joong-Ryoul;Kim, Myoung-Hee
    • 한국HCI학회:학술대회논문집
    • /
    • 2009.02a
    • /
    • pp.601-605
    • /
    • 2009
  • Due to the fact that fish-eye lens can provide super wide angles with the minimum number of cameras, field-of-view over 180 degrees, many vehicles are attempting to mount the camera system. Camera calibration should be preceded, and geometrical correction on the radial distortion is needed to provide the images for the driver's assistance. However, vehicle fish-eye cameras have diagonal output images rather than circular images and have asymmetric distortion beyond the horizontal angle. In this paper, we introduce a camera model and metric calibration method for vehicle cameras which uses feature points of the image. And undistort the input image through a perspective projection, where straight lines should appear straight. The method fitted vehicle fish-eye lens with different field of views.

  • PDF

Development of 360° Omnidirectional IP Camera with High Resolution of 12Million Pixels (1200만 화소의 고해상도 360° 전방위 IP 카메라 개발)

  • Lee, Hee-Yeol;Lee, Sun-Gu;Lee, Seung-Ho
    • Journal of IKEEE
    • /
    • v.21 no.3
    • /
    • pp.268-271
    • /
    • 2017
  • In this paper, we propose the development of high resolution $360^{\circ}$ omnidirectional IP camera with 12 million pixels. The proposed 12-megapixel high-resolution $360^{\circ}$ omnidirectional IP camera consists of a lens unit with $360^{\circ}$ omnidirectional viewing angle and a 12-megapixel high-resolution IP camera unit. The lens section of $360^{\circ}$ omnidirectional viewing angle adopts the isochronous lens design method and the catadioptric facet production method to obtain the image without peripheral distortion which is inevitably generated in the fisheye lens. The 12 megapixel high-resolution IP camera unit consists of a CMOS sensor & ISP unit, a DSP unit, and an I / O unit, and converts the image input to the camera into a digital image to perform image distortion correction, image correction and image compression And then transmits it to the NVR (Network Video Recorder). In order to evaluate the performance of the proposed 12-megapixel high-resolution $360^{\circ}$ omnidirectional IP camera, 12.3 million pixel image efficiency, $360^{\circ}$ omnidirectional lens angle of view, and electromagnetic certification standard were measured.

Design and Characteristics of 6-60 Lens for CCTV (CCTV용 6-60 렌즈의 설계 및 특성)

  • Han, Doo-Hee
    • Journal of Convergence Society for SMB
    • /
    • v.6 no.3
    • /
    • pp.85-91
    • /
    • 2016
  • It was difficult to verify the car number or face of inspector in the closed circuit television because of low CCD pixels and low brightness of lens. So CCTV lens should have higher pixels and brightness. In this paper, the design of zoom lens for mega pixel Closed-Circuit Television (CCTV) was introduced. We applied aspheric lens in order to reduce the spherical aberration and distortional aberration. And we applied focal length of 6-60mm, F number of 1.2, 3 million pixel resolution and magnifying power of 10 times. Also we applied infrared correction in order to use the CCTV camera in day and night effectively. These norms are the most powerful in CCTV zoom lens of focal length of 6-60mm. And if we apply this lens to the box style CCTV camera, we can verify the car number or face within 50m. Auto controlling system will be continued.

Extrinsic calibration using a multi-view camera (멀티뷰 카메라를 사용한 외부 카메라 보정)

  • 김기영;김세환;박종일;우운택
    • Proceedings of the IEEK Conference
    • /
    • 2003.11a
    • /
    • pp.187-190
    • /
    • 2003
  • In this paper, we propose an extrinsic calibration method for a multi-view camera to get an optimal pose in 3D space. Conventional calibration algorithms do not guarantee the calibration accuracy at a mid/long distance because pixel errors increase as the distance between camera and pattern goes far. To compensate for the calibration errors, firstly, we apply the Tsai's algorithm to each lens so that we obtain initial extrinsic parameters Then, we estimate extrinsic parameters by using distance vectors obtained from structural cues of a multi-view camera. After we get the estimated extrinsic parameters of each lens, we carry out a non-linear optimization using the relationship between camera coordinate and world coordinate iteratively. The optimal camera parameters can be used in generating 3D panoramic virtual environment and supporting AR applications.

  • PDF

A HIGH PRECISION CAMERA OPERATING PARAMETER MEASUREMENT SYSTEM AND ITS APPLICATION TO IMAGE MOTION INFERRING

  • Wentao-Zheng;Yoshiaki-Shishikui;Yasuaki-Kanatsugu;Yutaka-Tanaka
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • 1999.06a
    • /
    • pp.77-82
    • /
    • 1999
  • Information about camera operating such as zoom, focus, pan, tilt and tracking is useful not only for efficient video coding, but also for content-based video representation. A camera operating parameter measurement system designed specifically for these applications is therefore developed. This system, implemented in real time and synchronized with the video signal, measures the precise camera operating parameters. We calibrated the camera lens using a camera model that accounts for redial lens distortion. The system is then applied to infer image motion from pan and tilt operating parameters. The experimental results show that the inferred motion coincides with the actual motion very well, with an error of less than 0.5 pixel even for large motion up to 80 pixels.

Athermalized Design of Compact Optical System for Phone Camera (폰 카메라용 초소형 광학계의 온도보정 설계)

  • Park, Sung-Chan;You, Byoung-Taek;Lee, Jong-Ung
    • Korean Journal of Optics and Photonics
    • /
    • v.20 no.3
    • /
    • pp.148-155
    • /
    • 2009
  • In this paper, we analysed what effect the design variables, such as refractive index, central thickness and radius of curvature, had on the first order properties and image quality of optical systems when temperature changed. The optical parameters were varied at each temperature, then the coupling and ruler methods were used to design an athermalized lens for a phone camera. This concept was first used to design the lens for a 1/3.2" 5M phone camera. The designed lens satisfies all the specifications for a phone camera, and the variations of the back focal length(${\Delta}BFL$) are reduced to $10{\mu}m$ for a temperature range of $-10^{\circ}C$ to $+60^{\circ}C$. Also, the TTL of 5.5 mm results in a compact system. All design concepts and results discussed in this paper are expected to be useful in development for the phone and CCTV camera.