JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN
Online ISSN : 1884-4758
Print ISSN : 0388-3051
ISSN-L : 0388-3051
Determination of Droplet Size Distributions using Image Processing System
Hideaki SugitaTakeshi NakazawaShozo FukuharaHiromi Komuta
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1995 Volume 30 Issue 12 Pages 854-862

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Abstract

This paper describes the image processing system that automatically analyzes the size distributions in droplet video images.
This processing system, based on a conventional video camera, a digital image processor, a 32 bit personal computer and a monitor, is operated by a software written by the Basic of program language.
Images are generated by taking the microphotographs of the water droplets captured on a plate of glass coated with a slightly deteriorated cylinder oil. After image acquisition, the recorded video frames are replayed and analyzed under computer control.
The performance data are given from the experiment which is carried out to compare measurements of real spray distribution obtained by using the automatic system with those manually obtained from a microphotograph of water droplets.
Consequently, the accuracy for the both measurements is 7.54 % in relative error for 290 water droplets used here being varied over the range of 3 to 136μm in diameter.
Furthermore, it is found that by utilizing the image processing algorithm, the optimum threshold level is selected and this level is the value just before the black shadow begins to appear in the background of a monitor.

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