Evaluation of perfect and imperfect-gas interferograms by computer

Ben‐Dor, G.; Whitten, B. T.; Glass, I. I.

doi:10.1016/0142-727x(79)90014-6

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Digitization1

Fringe Tracing1

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1980

1992

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Cited by 10 publications

(2 citation statements)

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“…In the first beginnings of image processing the digitization was treated with various methods (Oshima 1979, McKeen and Tarasuk 1981, Becker 1982. Often a digitizing tablet was used for manual data input instead of direct digitization (Ben-Dor et al 1979, Cline et al 1982.…”

Section: Digitizationmentioning

confidence: 99%

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Computer-aided evaluation method for interferograms

Nübel

1992

Experiments in Fluids

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For the quantitative evaluation of interferograms a video camera is used to digitize the intcrferograms in frames up to 512 by 512 pixels which are transmitted to a host computer. Quantitative data of the whole field are obtained by the following procedure: First the fringes are extracted with the help of binarization methods. Then to each fringe boundary a value is assigned in a certain point. Starting from this point the boundaries are traced through the whole pattern. Finally the data between the fringe boundaries are determined by linear interpolation. Other operations like smoothing can be done before the results are printed.

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Section: Digitizationmentioning

confidence: 99%

“…Further steps of work may follow. For example, the elimination of an overlaid density wedge can be done by evaluating a no-flow interferogram and subtracting the second from the first result as done by Ben-Dor et al (1979), or by determining and subtracting the wedges gradient. Before outputting, the results may be smoothed.…”

Section: Fringe Tracingmentioning

confidence: 99%