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Digital sieving-Matlab based 3-D image analysis
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Engineering Geology and Geophysics.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Engineering Geology and Geophysics.
KTH, School of Technology and Health (STH), Medical Engineering.
2012 (English)In: Engineering Geology, ISSN 0013-7952, E-ISSN 1872-6917, Vol. 137-138, 74-84 p.Article in journal (Refereed) Published
Abstract [en]

A new image analysis technique for determining the three-dimensional size and shape distribution of coarse particles has been developed. It entails acquiring a pair of images, one each of the maximum and minimum projected area of the particles. Glow-In-the-Dark beads were used to create luminous background, thus it is named the GID method. In this study the size and shape distribution of four coarse-grained samples, size varies from 2 to 20. cm, have been analyzed. The size distribution of the samples obtained from the GID analysis is comparable to sieve analysis results, and has an extra advantage of being applicable in the field. The algorithm was developed in Matlab; therefore users could make some optimization in the program to meet their own needs as the program code is open source.

Place, publisher, year, edition, pages
2012. Vol. 137-138, 74-84 p.
Keyword [en]
Digital sieving, Image analysis, Particle form, Particle size, Shape distribution
National Category
Civil Engineering Geophysical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-32361DOI: 10.1016/j.enggeo.2012.04.001ISI: 000304745500008Scopus ID: 2-s2.0-84860130845OAI: oai:DiVA.org:kth-32361DiVA: diva2:410276
Funder
Formas
Note
QC 20120611. Updated from submitted to published.Available from: 2011-04-13 Created: 2011-04-13 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Physical properties of coarse particles in till coupled to bedrock composition based on new 3D image analysis method
Open this publication in new window or tab >>Physical properties of coarse particles in till coupled to bedrock composition based on new 3D image analysis method
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The physical properties of the coarse fraction of the till (0.4 to 20 cm) and the surface boulders have been studied at two different sites in Sweden. The research work included: development of a new image analysis software for 3D size and shape measurements of particles; lithological analysis on multiple size fractions in till and magnetic susceptibility survey on coarse till clasts, surface boulders and local bedrock.

The new 3D image analysis method provides an enormous amount of size and shape data for each particle in the coarse fraction (2 to 20 cm) in till. The method is suitable for field study, cost effective and the software is executable in Matlab. The field imaging method together with the image analysis software give non subjective results of size and shape of coarse particles and makes it feasible and easy to study representative sample size, which is one tonne for testing clasts of size up to 20 cm.

The lithological analysis of the multiple size fraction of the till clasts has been investigated on six different size fractions of the till (0.4 to 20 cm); the result of the different samples from the two sites shows that this method can potentially be used as a stratigraphic tool in the areas where there is no unique indicator lithologies.

The magnetic susceptibility has been made on the surface boulders, the 6-20 cm till fraction and on insitu bedrock outcrops near to the study sites. The method has good potential for determining stratigraphic relationships between different till units as well as for determining the provenance ofcoarse clasts and surface boulders.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. x, 43 p.
Series
Trita-LWR. LIC, ISSN 1650-8629 ; 2047
Keyword
Three-dimensional shape, Grain size, Till lithology, Natural aggregate, Till provenance, Magnetic susceptibility of rock, Physical property of till
National Category
Civil Engineering Geophysical Engineering
Identifiers
urn:nbn:se:kth:diva-11988 (URN)978-91-7415-563-1 (ISBN)
Presentation
2010-02-26, V77, Teknikringen 74, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Note
QC 20110413Available from: 2010-02-09 Created: 2010-02-05 Last updated: 2011-04-13Bibliographically approved
2. Physical characterization of coarse clasts with 3D image-analysis method: development, evaluation and application
Open this publication in new window or tab >>Physical characterization of coarse clasts with 3D image-analysis method: development, evaluation and application
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents a novel three dimensional (3D) image-analysis method for characterizing the physical characteristics of coarse particles in the field, and introduces new methodology for the total analysis of glacial till samples.

The novel image analysis method, called the GID method, is capable of determining the size, shape and surface texture of each individual clast analysed. Images of particles are taken in the field and analysis is done in the laboratory. Therefore the GID method makes it feasible to analyse statistically representative large sample in short period; for poorly sorted sediments, such as till, one-tonne is required if the analysis includes cobble size. The capability of the GID method was demonstrated by studying coarse clasts (20-200 mm) from till. There is excellent agreement in the results of the size distribution obtained from the GID method and sieve analysis. The GID method results for size and shape parameters show high and very high repeatability. The particle angularity in the GID method has not been measured to acceptable level; the repeatability test shows some variability.

The new methodology for total analysis of till applied the GID method at four different locations in Sweden. The total analysis included 3D size and shape distribution of coarse particles coupled to electrical resistivity, lithological distribution and magnetic susceptibility of the clasts. The results show clear difference in the till samples from the different sites.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. x, 34 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1066
Keyword
3D image analysis; Particle angularity; Sieve analysis; Particle form; Gravel analysis; Repeatability; Lithological distribution
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-101388 (URN)978-91-7501-458-6 (ISBN)
Public defence
2012-09-12, V2, Teknikringen 74, KTH, Stockholm, 14:15 (English)
Opponent
Supervisors
Funder
Formas
Note

QC 20120828

Available from: 2012-08-28 Created: 2012-08-27 Last updated: 2012-08-28Bibliographically approved

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