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Atomization and Sprays
インパクトファクター: 1.189 5年インパクトファクター: 1.596 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v11.i4.20
pages 317-333

DETERMINATION OF IN-FOCUS CRITERIA AND DEPTH OF FIELD IN IMAGE PROCESSING OF SPRAY PARTICLES

Kwang Uoong Koh
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon, Korea
Joo Youn Kim
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusong-Gu, Taejon, 305-701 Korea
Sang Yong Lee
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea

要約

In the present study, in-focus criteria and depth of field in image processing of spray particles within the size range 10–300 mm have been examined. As the indices of the in-focus criteria, the critical normalized value of contrast (VCcritical) proposed earlier was carefully reviewed, and the concept of the critical gradient indicator (GIcritical) was newly introduced. The criterion with VCcritical) was confirmed to be appropriate only for the small particle range (Ј 30 mm). In contrast, the criterion with GIcritical was determined to be appropriate for large particles і 30 mm). The dependence of the depth of field on the values of VCcritical and GIcritical was examined. The depth of field decreases with higher values of VCcritical and GIcritical , and varies linearly with particle size in both VC- and GI-applicable ranges. To keep the normalized standard deviation of the measurements below 0.1 while maintaining the continuity of the depth-of-field variation at the borderline of 30 mm, the adjustable constants C and DGI for VCcritical and GIcritical should be set to 0.85 and 0.22, respectively, for the present optical setup.


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