• Title/Summary/Keyword: camera image

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Development of Network Camera-based Instant Messenger (네트워크 카메라 기반 인스턴트 메신저의 개발에 대한 연구)

  • Lee, Kang-Seok;Yum, Chang-Sun
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.33 no.2
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    • pp.133-139
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    • 2010
  • PC camera-based instant messenger have problems of video image break/delay and noise. The reason is caused by a composed problem that PC Camera is belong to the connected PC and operating in the PC. This research suggests an instant messenger that uses network camera connected to LAN instead of PC camera. Therefore, the instant messenger has a component that the camera is separated from PC. This research designs sequence diagram, video calls flow chart, and graphic user interface of the instant messenger. The instant messenger based on network camera provides high quality video calls service and makes it possible to call from a special remote site with real-time video image.

Analysis of Image Quality on Camera-based Barcode Reading System (카메라 기반 바코드 판독 시스템에서의 바코드 영상 품질 향상에 관한 연구)

  • 박상은;박문성;김인수;김혜규
    • Proceedings of the IEEK Conference
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    • 2003.11a
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    • pp.481-484
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    • 2003
  • In this paper, we propose a method that acquires proper image for barcode reading on camera-based barcode reading system. In the camera system, there is serious blurring problem, and to get proper output of the barcode, it must be solved. To solve it, we proposed two methods. The first one is to make the camera movable, so it can change the distance of focus. The other is software approach, and threshold value is revised through regression analysis. Using such process, we can notice that blurring problem can be overcome.

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Omnidirectional Camera Motion Estimation Using Projected Contours (사영 컨투어를 이용한 전방향 카메라의 움직임 추정 방법)

  • Hwang, Yong-Ho;Lee, Jae-Man;Hong, Hyun-Ki
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.44 no.5
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    • pp.35-44
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    • 2007
  • Since the omnidirectional camera system with a very large field of view could take many information about environment scene from few images, various researches for calibration and 3D reconstruction using omnidirectional image have been presented actively. Most of line segments of man-made objects we projected to the contours by using the omnidirectional camera model. Therefore, the corresponding contours among images sequences would be useful for computing the camera transformations including rotation and translation. This paper presents a novel two step minimization method to estimate the extrinsic parameters of the camera from the corresponding contours. In the first step, coarse camera parameters are estimated by minimizing an angular error function between epipolar planes and back-projected vectors from each corresponding point. Then we can compute the final parameters minimizing a distance error of the projected contours and the actual contours. Simulation results on the synthetic and real images demonstrated that our algorithm can achieve precise contour matching and camera motion estimation.

Removing Shadows for the Surveillance System Using a Video Camera (비디오 카메라를 이용한 감시 장치에서 그림자의 제거)

  • Kim, Jung-Dae;Do, Yong-Tae
    • Proceedings of the KIEE Conference
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    • 2005.05a
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    • pp.176-178
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    • 2005
  • In the images of a video camera employed for surveillance, detecting targets by extracting foreground image is of great importance. The foreground regions detected, however, include not only moving targets but also their shadows. This paper presents a novel technique to detect shadow pixels in the foreground image of a video camera. The image characteristics of video cameras employed, a web-cam and a CCD, are first analysed in the HSV color space and a pixel-level shadow detection technique is proposed based on the analysis. Compared with existing techniques where unified criteria are used to all pixels, the proposed technique determines shadow pixels utilizing a fact that the effect of shadowing to each pixel is different depending on its brightness in background image. Such an approach can accommodate local features in an image and hold consistent performance even in changing environment. In experiments targeting pedestrians, the proposed technique showed better results compared with an existing technique.

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Experimental realization of an imaging system using wavefront coding in mobile phone camera (휴대폰용 카메라 모듈에서 파면코딩을 통한 이미지 시스템 실험구현)

  • Kim, Jong-Pil;Lee, Sang-Hyuck;Park, No-Cheol;Park, Young-Pil;Park, Kyoung-Su
    • Transactions of the Society of Information Storage Systems
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    • v.5 no.1
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    • pp.36-40
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    • 2009
  • We describe the experimental realization of image system using wavefront coding in 3-Mega pixel mobile phone camera. We designed aspheric lens to extend the depth of field (DOF) using wavefront coding. In addition, through the aspheric lens and lens barrel manufacturing, we obtained a raw image from a camera module. In our method, the acquired images are restored in the spatial frequency domain using the proposed filter and the spatial frequency response (SFR) is calculated. The proposed filters are composed of image denoising filter using low band pass filter in frequency domain and restoration filter for image restoration. Finally, we achieve an enhanced image by super-resolution image processing. Visual examples are given to demonstrate the performance of the proposed filter.

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Constructing Cylindrical Panoramic Image from Panning Motion Camera using Simple Translation Motion Model (이동운동모델만을 이용한 수평 회전 카메라로부터 실린더 파노라믹 영상 생성)

  • Jang, Gyeong-Ho;Jeong, Sun-Gi
    • Journal of KIISE:Computer Systems and Theory
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    • v.28 no.12
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    • pp.653-659
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    • 2001
  • In this paper, we propose an efficient algorithm for constructing cylindrical panoramic image. At first, we describe a fast image alignment algorithm, which matches image strips located on equal distance for image centers. And then, we explain how to estimate accurately the effective focal length of camera by a bisection method. Although there is a limitation in that the image should be taken by a camera with pure panning motion, the proposed simple and fast algorithm is applicable to practical application.

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A Study on the Camera Calibration for Precision Measurement (정밀측정을 위한 카메라 보정에 관한 연구)

  • 김준희
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1996.03a
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    • pp.52-55
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    • 1996
  • Though the increment of using computer vision system in modern industry, there are lots of difficulties to measure precisely because of measurement error distortion phenomenon. Between these reasons, the distortion of edge is dominant reason which is occured by the blurred image. The blurred image is happened when camera can not discriminate its precise focus. To correct and generalize distortion phenomenon is imprrtant. Thus we must fix the discrimination criteria which is collected by image recognition of precise focus. The edge of image means discontinuous point of intensity, and the component of edge is discribed as high frequency component at special domain specturm of image. The good condition of focus means there are much high frequency energy in image. The method of discribing high frequency energy is gradient operater which determines the condition of focus.

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The Development of Camera Detection System for the Measurement Road Traffic Data (영상검지 카메라를 이용한 도로상의 차량흐름 계측방안 연구)

  • Kim, Hie-Sik;Kim, Jin-Man
    • Journal of the Korean Society of Safety
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    • v.18 no.4
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    • pp.23-27
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    • 2003
  • To improve the road transportation safety, the road traffic data is monitored by applying an image detection system. The road traffic safety is analysed using image processing techniques. For more accurate measurement, the coordinate matching of real road data to image is one of the most essential parts of the image detection technique. The road image is skewed at the input screen, because the video camera is installed at the roadside. A fast and precise algorithm for the coordinate matching is developed to convert image coordinates into road coordinates.

Construction of Efficient Panoramic Image (효율적인 파노라믹 영상 구축)

  • Shin, Seong-Yoon;Baek, Jeong-Uk;Rhee, Yang-Won
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2010.05a
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    • pp.155-156
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    • 2010
  • `Panoramic image' is called generally 'mosaic image', to create a new image by matching the number of relevant images. In this paper, we are entering data through the camera. Therefore, perspective model was used for recognition of camera parameters, minimizing the discrepancies by proposing measure of discrepancy between the frames. In addition, how to create panoramic images is proposed by fixed reference and time-varying reference in order to create panoramic images.

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