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A multi-thresholding algorithm for sizing out of focus particles

A multi-thresholding algorithm for sizing out of focus particles
A multi-thresholding algorithm for sizing out of focus particles
A methodology is presented that enables efficient acquisition of sufficient droplet information (e.g. diameter and aspect ratio) from images of in and out of focus droplets. The newly developed multi-threshold algorithm is successfully implemented in the automatic particle/droplet image analysis (PDIA) system. Under the same optical hardware set-up, and compared to the dual threshold methods [1], the multi-threshold method increases the measurable/acceptable depth of field (DoF) of particles, especially for the small particles of diameters less than 50??m (1098?pixels in this optical set-up). When testing the 70??m~110??m and 100??m~200??m moving glass spheres, the dual threshold method can only detect 11%~29?% of the particles found by the multi-threshold method. The multi-threshold method is also capable of generating the aspect ratios of particles more accurately than dual threshold methods.
depth-of-field, digital image analysis, multi-threshold method
0934-0866
78-92
Shrimpton, J.S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Ju, D.
98531133-2048-4339-ba75-892168b50a51
Hearn, A.
9ca64d8b-137c-4bb7-b1b1-6ddc3119117c
Shrimpton, J.S.
9cf82d2e-2f00-4ddf-bd19-9aff443784af
Ju, D.
98531133-2048-4339-ba75-892168b50a51
Hearn, A.
9ca64d8b-137c-4bb7-b1b1-6ddc3119117c

Shrimpton, J.S., Ju, D. and Hearn, A. (2012) A multi-thresholding algorithm for sizing out of focus particles. Particle & Particle Systems Characterization, 29 (2), 78-92. (doi:10.1002/ppsc.201100032).

Record type: Article

Abstract

A methodology is presented that enables efficient acquisition of sufficient droplet information (e.g. diameter and aspect ratio) from images of in and out of focus droplets. The newly developed multi-threshold algorithm is successfully implemented in the automatic particle/droplet image analysis (PDIA) system. Under the same optical hardware set-up, and compared to the dual threshold methods [1], the multi-threshold method increases the measurable/acceptable depth of field (DoF) of particles, especially for the small particles of diameters less than 50??m (1098?pixels in this optical set-up). When testing the 70??m~110??m and 100??m~200??m moving glass spheres, the dual threshold method can only detect 11%~29?% of the particles found by the multi-threshold method. The multi-threshold method is also capable of generating the aspect ratios of particles more accurately than dual threshold methods.

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More information

Published date: June 2012
Keywords: depth-of-field, digital image analysis, multi-threshold method
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 349240
URI: http://eprints.soton.ac.uk/id/eprint/349240
ISSN: 0934-0866
PURE UUID: 66c35aea-ee39-425f-9b93-e68a87b49f70

Catalogue record

Date deposited: 26 Feb 2013 16:46
Last modified: 16 Jul 2019 21:42

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Contributors

Author: J.S. Shrimpton
Author: D. Ju
Author: A. Hearn

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