Multiple optical calibration system–based effective multiviews video processing

Kyung-Hoon Bae

doi:10.1117/1.3102841

Multiple optical calibration system–based effective multiviews video processing

Optical Engineering ◽

10.1117/1.3102841 ◽

2009 ◽

Vol 48 (3) ◽

pp. 037008

Author(s):

Kyung-Hoon Bae

Keyword(s):

Video Processing ◽

Calibration System ◽

Optical Calibration

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The atmospheric optical calibration system

10.1109/pvsc.1988.105906 ◽

1988 ◽

Author(s):

T.W. Cannon ◽

R.L. Hulstrom

Keyword(s):

Calibration System ◽

Optical Calibration

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Dial Instrument Calibration by both Automatic and Half-Automatic Methods

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.157-158.581 ◽

2012 ◽

Vol 157-158 ◽

pp. 581-588

Author(s):

Zhen Long Bai ◽

Xiang Li

Keyword(s):

Video Processing ◽

Processing Technique ◽

Automatic Calibration ◽

Automatic Method ◽

Edge Extraction ◽

Calibration System ◽

Practical Application ◽

Instrument Calibration ◽

Different Types ◽

Automatic Methods

This paper presents a calibration system by video processing technique. The system can calibrate large number of different types of dial instruments. The system is composed of an automatic recog-nition approach and a half-automatic approach. Both the automatic calibration and half-automatic calibration include four steps: 1st, dial plane circle edge extraction and center identification; 2nd, pointer extraction; 3rd, scale start and end position identification; 4th, result reading. For half-automatic method, the 1st step and 3rd step are manually indentified. By experiments and practical application in industry, it proves that our calibration system is effective for more than hundreds of different types of dial instruments.

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Laser interferometer calibration system for extensometers

Bulletin of the Seismological Society of America ◽

10.1785/bssa0580051379 ◽

1968 ◽

Vol 58 (5) ◽

pp. 1379-1383

Author(s):

G. Hade ◽

M. Conner ◽

J. T. Kuo

Keyword(s):

Laser Interferometer ◽

Michelson Interferometer ◽

Low Frequency ◽

Calibration Method ◽

Linear Range ◽

Laser Source ◽

Calibration System ◽

Frequency Oscillator ◽

Transducer Output ◽

Optical Calibration

Abstract A laser interferometer technique has been developed for calibrating extensometers at the Ogdensberg Station of Lamont Geological Observatory. It provides remotecontrolled calibration of both horizontal and vertical extensometers within the linear range of the transducer output. The present calibration system consists of an electromagnetic driving unit and a Michelson interferometer. The transducer end of the extensometer is displaced longitudinally with an electromagnetic driving unit, which is excited by a variable low-frequency oscillator with a bandwidth of 0.0005 to 60 kHz. The resultant displacement is detected by counting fringe displacements of the interferometer with an Ne-He laser source. With this calibration system, motion as small as 0.03 micron can be determined with excellent repeatability and with errors of less than 5 per cent, in comparison with errors of more than 40 per cent for the optical calibration method previously used.

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