• Title/Summary/Keyword: Image processing technique

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Measurement of Size Distributions of Submicron Electrosprays Using a Freezing Method and an Image Processing Technique (냉각법 및 영상 처리기법을 이용한 서브마이크론 정전분무 액적의 크기분포 측정)

  • Ku, Bon-Ki;Kim, Sang-Soo;Kim, Yu-Dong
    • Proceedings of the KSME Conference
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    • 2001.06e
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    • pp.100-106
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    • 2001
  • The size distributions of electrospray droplets from the Taylor cone in cone-jet mode are directly measured by using a freezing method and a transmission electron microscope (TEM) image processing technique. These results are compared with the data obtained by an aerodynamic size spectrometer (TSI Aerosizer DSP). The use of glycerol seeded with NaI and a freezing method make it possible to sample droplets with their original sizes preserved. Since pictures of droplets are taken with TEM with very low vapor pressure of the solution, evaporation is suppressed by freezing. For liquid flow rates below 1 nl/sec, the measured droplet diameters by the TEM image processing technique and the aerosizer are in the range of 0.25 to $0.32{\mu}m$ and 0.30 to $0.40{\mu}m$, respectively. Comparing the TEM data with the aerosizer measurements, it has been revealed that the TEM image processing technique can afford more accurate values of droplet size distributions in the submicron range of 0.1 to $0.4{\mu}m$.

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Image Processing Technique for Measuring the Static Displacement of Bridges from General Inspection Photograph (일반 점검사진에서 교량의 정적 변위 추출을 위한 영상처리기법)

  • Cho, Jun Sang;Huh, Young
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.31 no.3A
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    • pp.173-180
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    • 2011
  • This paper aims to propose an image processing technique for measuring the static displacement of bridges from general inspection photograph; the color, shape, and spatial transformations of an arbitrary image stored in bridge management system database are used. This study is verified by using numerical analyses with experiments; the results demonstrate that the static displacement of bridges are measured by proposed technique. Moreover, this technique is able to obtain the static structural response of the bridge with changes in temperatures.

Development of automatic measurement method of concentricity and roundness using image processing technique

  • Moon, Hyung-Wook;Huh, Kyung-Moo
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.130.2-130
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    • 2001
  • In this paper, we suggest an algorithm for the automatic measurement of concentricity and roundness using image processing technique. From the experimental results, we could find that the required measurement accuracy specification is sufficiently satisfied using our proposed method.

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Measurement of Size Distributions of Submicron Electrosprays Using a Freezing Method and an Image Processing Technique (냉각법 및 영상 처리기법을 이용한 서브마이크론 정전분무 액적의 크기분포 측정)

  • Gu, Bon-Gi;Kim, Sang-Su;Kim, Yu-Dong;Lee, Sang-Yong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.25 no.10
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    • pp.1400-1407
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    • 2001
  • The size distributions of electrospray droplets from the Taylor cone in cone-jet mode are directly measured by using a freezing method and a transmission electron microscope (TEM) image processing technique. These results are compared with the data obtained by an aerodynamic size spectrometer (TSI Aerosizer DSP). The use of glycerol seeded with NaI and a freezing method make it possible to sample droplets with their original sizes preserved. Since pictures of droplets are taken with TEM with very low vapor pressure of the solution, evaporation is suppressed by freezing. For liquid flow rates below 1 nl/sec, the measured droplet diameters by the TEM image processing technique and the aerosizer are in the range of 0.25 to 0.32 m add 0.3B to 0.40m, respectively. Comparing the TEM data with the aerosizer measurements, it has been revealed that the TEM image processing technique can afford more accurate values of droplet size distributions in the submicron range of 0.1 to 0.4m.

Image processing technique for Optical Camera Communication (OCC에서의 이미지 처리 기술)

  • Nguyen, Trang;Le, Nam-Tuan;Jang, Yeong Min
    • Journal of Satellite, Information and Communications
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    • v.9 no.3
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    • pp.47-52
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    • 2014
  • This paper introduces the Optical Camera Communications (OCC) using image processing technique. The architecture and operation of OCC system are given. To enhance data rate which is limited by sampling operation of commercial 30fps camera, multi colors transmission technique is employed, leading to the importance of color image processing technique. Multi color encoding and image processing based decoding will be proposed in the paper.

Detecting Pattern of Voids in Concrete Using Ultrasonic Image Processing Technique (초음파 화상처리기법을 이용한 콘크리트 내부공동의 형상검출에 관한 연구)

  • 박석균;이한범;오윤식
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.783-788
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    • 2001
  • Voids created with concrete construction or deterioration result in serious weakness from the aspects of both structural and durable function. Ultrasonic method using image processing technique was used for detecting pattern of voids in concrete in this study Experimental investigation was carried out for three types(patterns) of void in concrete. The effect of curing period of concrete and ultrasonic measurement method was also investigated. As a result it has been verified that the semi-direct measurement method is more effective than the other methods for detecting pattern of voids in concrete in ultrasonic method using image processing technique. The longer the curing period of concrete is, the better the detection accuracy of void pattern can be obtained.

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Developemet of noncontact velocity tracking algorithm for 3-dimensional high speed flows using digital image processing technique (디지털 화상처리를 이용한 유동장의 비접촉 3차원 고속류 계측법의 개발)

  • 도덕희
    • Journal of Advanced Marine Engineering and Technology
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    • v.23 no.2
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    • pp.259-269
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    • 1999
  • A new algorithm for measuring 3-D velocity components of high speed flows were developed using a digital image processing technique. The measuring system consists of three CCD cameras an optical instrument called AOM a digital image grabber and a host computer. The images of mov-ing particles arranged spatially on a rotation plate are taken by two or three CCD cameras and are recorderd onto the image grabber or a video tape recoder. The three-dimensionl velocity com-ponents of the particles are automatically obtained by the developed algorithm In order to verify the validity of this technique three-dimensional velocity data sets obtained from a computer simu-lation of a backward facing step flow were used as test data for the algorithm. an uncertainty analysis associated with the present algorithm is systematically evaluated, The present technique is proved to be used as a tookl for the measurement of unsteady three-dimensional fluid flows.

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Deveopement of Scratch Detection Algorithm for ITO coated Glass using Image Processing Technique (화상처리를 이용한 ITO 코팅 유리의 결함검출기법 개발)

  • 김면희;배준영;이태영;안경철;이상룡
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1275-1278
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    • 2003
  • This research describes a image-processing technique for the scratch detecting algorithm for ITO coated glass. The light emitter efficiency of Organic EL has a failing-off in quality due to many causes. One of the many causes was the defects of the surface in ITO coated glass. We use the logical level thresholding method for binarization of gray-scaled glass image. This method is useful to the algorithm for detecting scratch of ITO coated glass automatically without need of any prior information of manual fine tuning of parameters.

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Development of Fish Farm Monitoring System Using Image Processing Technique -1. Motion Measurement for Moving Body in the Wave Tank- (화상처리 기법을 애용한 어장 조성효과의 모니터링 시스템 개발 -1. 실험수조에서의 이동물체에 대한 운동계측-)

  • JEE Myoung-Seok;KIM Seoung-Gun;JEONG Seok-Kwon;KIM Sang-Bong
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.28 no.3
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    • pp.309-315
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    • 1995
  • This paper describes a monitoring system for fish farm formation effect based on personal computer by using an image processing technique. This method is based on image processing technique incorporating concept of window and threshold processing to track the target object and to distinguish it from background. The image processing program runs in the veal time so that all program modules are able to process multi-task. The effectiveness is evaluated through the comparative study on the motion of lantern net for the scallop culturing by wave action in an experimental wave tank.

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