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Marklund, Olov
Publications (10 of 26) Show all publications
Thurley, M., Andersson, T., Marklund, O. & Larsson, J. E. (2008). Projekt: 3D Mätning Projekt. Paper presented at .
Open this publication in new window or tab >>Projekt: 3D Mätning Projekt
2008 (English)Other (Other (popular science, discussion, etc.))
Abstract [en]

This project developed an industrial prototype 3D imaging and analysis system for measuring the size distribution of iron ore green pellets. The system is installed and operational at a pellet production plant capturing and analysising 3D surface data of piled pellets on the conveyor belt. It provides fast, frequent, non-contact, consistent measurement of the pellet sieve size distribution and opens the door to autonomous closed loop control of the pellet balling disk or drum in the future. Segmentation methods based on morphological image processing are applied to the 3D surface data to identify individual pellets. Determination of entirely visible pellets (non-overlapped) is made using a two feature classification strategy, the advantage being that this system eliminates the bias the results from sizing overlapped particles based on their limited visible profile. The system achieves what a number of commercial 2D fragmentation measurement systems could not satisfactorily achieve for the pellet producer, that is, accurate sizing of the green pellets.

National Category
Signal Processing
Research subject
Signal Processing
Identifiers
urn:nbn:se:ltu:diva-36102 (URN)6a983657-28d8-4405-85c9-4c84a169bbcf (Local ID)6a983657-28d8-4405-85c9-4c84a169bbcf (Archive number)6a983657-28d8-4405-85c9-4c84a169bbcf (OAI)
Note

Publikationer: On-line 3D surface measurement of iron ore green pellets; Pellet size estimation using spherical fitting; Identification and sizing of the entirely visible rocks from a 3D surface data segmentation of laboratory rock piles; Visibility classification of pellets in piles for sizing without overlapped particle error; An industrial 3D vision system for size measurement of iron ore green pellets using morphological image segmentation; Status: Ended; Period: 17/12/2010 → …

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Andersson, T., Thurley, M. & Marklund, O. (2008). Visibility classification of pellets in piles for sizing without overlapped particle error (ed.). In: (Ed.), Murk J. Bottema (Ed.), 9th Biennial Conference of the Australian Pattern Recognition Society on Digital Image Computing Techniques and Applications: DICTA 2007 ; 3 - 5 Dec. 2007, Glenelg, [Adelaide], South Australia ; pPiscataway, NJ oceedings. Paper presented at Biennial Conference of the Australian Pattern Recognition Society on Digital Image Computing Techniques and Applications : 03/12/2007 - 05/12/2007 (pp. 508-514). : IEEE Communications Society
Open this publication in new window or tab >>Visibility classification of pellets in piles for sizing without overlapped particle error
2008 (English)In: 9th Biennial Conference of the Australian Pattern Recognition Society on Digital Image Computing Techniques and Applications: DICTA 2007 ; 3 - 5 Dec. 2007, Glenelg, [Adelaide], South Australia ; pPiscataway, NJ oceedings / [ed] Murk J. Bottema, IEEE Communications Society, 2008, p. 508-514Conference paper, Published paper (Refereed)
Abstract [en]

Size measurement of pellets in industry is usually performed by manual sampling and sieving techniques. Automatic on-line analysis of pellet size based on image analysis techniques would allow non-invasive, frequent and consistent measurement. We make a distinction between entirely visible and partially visible pellets. This is a significant distinction as the size of partially visible pellets cannot be correctly estimated with existing size measures and would bias any size estimate. Literature review indicates that other image analysis techniques fail to make this distinction. Statistical classification methods are used to discriminate pellets on the surface of a pile between entirely visible and partially visible pellets. Size estimates of the surface of a pellet pile show that the overlapped particle error is overcome by only estimating the surface size distribution with entirely visible pellets.

Place, publisher, year, edition, pages
IEEE Communications Society, 2008
National Category
Signal Processing
Research subject
Signal Processing
Identifiers
urn:nbn:se:ltu:diva-37456 (URN)10.1109/DICTA.2007.4426839 (DOI)2-s2.0-44949169747 (Scopus ID)b7e7f3c0-6a72-11dc-9e58-000ea68e967b (Local ID)978-1-424-43161-8 (ISBN)b7e7f3c0-6a72-11dc-9e58-000ea68e967b (Archive number)b7e7f3c0-6a72-11dc-9e58-000ea68e967b (OAI)
Conference
Biennial Conference of the Australian Pattern Recognition Society on Digital Image Computing Techniques and Applications : 03/12/2007 - 05/12/2007
Projects
3D Mätning Projekt
Note
Godkänd; 2008; 20070924 (tobiasa)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
Andersson, T., Thurley, M. & Marklund, O. (2007). Pellet size estimation using spherical fitting (ed.). In: (Ed.), (Ed.), 2007 IEEE Instrumentation and Measurement Technology Conference Proceedings: Warsaw, Poland, 1 - 3 May 2007. Paper presented at IEEE Instrumentation & Measurement Technology Conference : 01/05/2007 - 03/05/2007 (pp. 1-5). Piscataway, NJ: IEEE Communications Society
Open this publication in new window or tab >>Pellet size estimation using spherical fitting
2007 (English)In: 2007 IEEE Instrumentation and Measurement Technology Conference Proceedings: Warsaw, Poland, 1 - 3 May 2007, Piscataway, NJ: IEEE Communications Society, 2007, p. 1-5Conference paper, Published paper (Refereed)
Abstract [en]

Evaluation of Spherical Fitting as a technique for sizing iron ore pellets is performed. Size measurement of pellet in industry is usually performed by manual sampling and sieving techniques. Automatic on-line analysis of pellet size would allow non-invasive, frequent and consistent measurement. Previous work has used an assumption that pellets are spherical to estimate pellet sizes. In this research we use a 3D laser camera system in a laboratory environment to capture 3D surface data of pellets and steel balls. Validation of the 3D data against a spherical model has been performed and demonstrates that pellets are not spherical and have physical structures that a spherical model cannot capture.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Communications Society, 2007
National Category
Signal Processing
Research subject
Signal Processing
Identifiers
urn:nbn:se:ltu:diva-37611 (URN)10.1109/IMTC.2007.379014 (DOI)badf49d0-3aa6-11dc-b411-000ea68e967b (Local ID)1-4244-0588-2 (ISBN)badf49d0-3aa6-11dc-b411-000ea68e967b (Archive number)badf49d0-3aa6-11dc-b411-000ea68e967b (OAI)
Conference
IEEE Instrumentation & Measurement Technology Conference : 01/05/2007 - 03/05/2007
Projects
3D Mätning Projekt
Note
Godkänd; 2007; 20070725 (tobiasa)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Marklund, O., Huntley, J. M. & Cusack, R. (2007). Robust unwrapping algorithm for three-dimensional phase volumes of arbitrary shape containing knotted phase singularity loops (ed.). Paper presented at . Optical Engineering: The Journal of SPIE, 46(8)
Open this publication in new window or tab >>Robust unwrapping algorithm for three-dimensional phase volumes of arbitrary shape containing knotted phase singularity loops
2007 (English)In: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 46, no 8Article in journal (Refereed) Published
Abstract [en]

The extension of path-independent 2-D phase unwrapping algorithms, based on placement of branch cut lines between phase singularities of opposite sign, was recently proposed for phase volumes in a paper by Huntley. In 3-D, the singularities were shown to form closed loops, and path independence was achieved by placing branch cut surfaces across the loops. In the current work, we describe in detail an optimized and extended version of Huntley's algorithm. It deals in particular with two aspects that are essential for practical phase volumes: 1. how to close partial loops that pass through arbitrary boundaries separating valid and invalid phase data, and 2. how to select the set of loops having the shortest length. The second algorithm is necessary to deal with ambiguous cases that can arise when the singularities form knots, i. e., two loops pass through a single phase volume element. The performance of the algorithm is demonstrated on 3-D phase maps from two types of medical imaging data: medical resonance imaging (MRI) and x-ray interferometry.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-4730 (URN)10.1117/1.2771652 (DOI)000250200800024 ()2-s2.0-36048946109 (Scopus ID)2b9d7180-9ce3-11dc-97ff-000ea68e967b (Local ID)2b9d7180-9ce3-11dc-97ff-000ea68e967b (Archive number)2b9d7180-9ce3-11dc-97ff-000ea68e967b (OAI)
Note
Validerad; 2007; Bibliografisk uppgift: Paper id:: 085601; 20071127 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Saltify, M., Huntley, J., Graves, M., Marklund, O., Cusack, R. & Beauregard, D. (2006). Extending the dynamic range of phase contrast magnetic resonance velocity imaging using advanced higher-dimensional phase unwrapping algorithms (ed.). Paper presented at . Journal of the Royal Society Interface, 3(8), 415-427
Open this publication in new window or tab >>Extending the dynamic range of phase contrast magnetic resonance velocity imaging using advanced higher-dimensional phase unwrapping algorithms
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2006 (English)In: Journal of the Royal Society Interface, ISSN 1742-5689, E-ISSN 1742-5662, Vol. 3, no 8, p. 415-427Article in journal (Refereed) Published
Abstract [en]

Phase contrast magnetic resonance velocity imaging is a powerful technique for quantitative in vivo blood flow measurement. Current practice normally involves restricting the sensitivity of the technique so as to avoid the problem of the measured phase being 'wrapped' onto the range - π to + π. However, as a result, dynamic range and signal-to-noise ratio are sacrificed. Alternatively, the true phase values can be estimated by a phase unwrapping process which consists of adding integral multiples of 2π to the measured wrapped phase values. In the presence of noise and data undersampling, the phase unwrapping problem becomes non-trivial. In this paper, we investigate the performance of three different phase unwrapping algorithms when applied to three-dimensional (two spatial axes and one time axis) phase contrast datasets. A simple one-dimensional temporal unwrapping algorithm, a more complex and robust three-dimensional unwrapping algorithm and a novel velocity encoding unwrapping algorithm which involves unwrapping along a fourth dimension (the 'velocity encoding' direction) are discussed, and results from the three are presented and compared. It is shown that compared to the traditional approach, both dynamic range and signal-to-noise ratio can be increased by a factor of up to five times, which demonstrates considerable promise for a possible eventual clinical implementation. The results are also of direct relevance to users of any other technique delivering time-varying two-dimensional phase images, such as dynamic speckle interferometry and synthetic aperture radar

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-12458 (URN)10.1098/rsif.2005.0096 (DOI)000244164900006 ()2-s2.0-34247622805 (Scopus ID)b9ca23f0-a9c8-11df-a707-000ea68e967b (Local ID)b9ca23f0-a9c8-11df-a707-000ea68e967b (Archive number)b9ca23f0-a9c8-11df-a707-000ea68e967b (OAI)
Note
Validerad; 2006; 20100817 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Marklund, O., Huntley, J. & Cusack, R. (2005). Robust unwrapping algorithm for 3-D phase volumes of arbitrary shape containing knotted phase singularity loops (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Robust unwrapping algorithm for 3-D phase volumes of arbitrary shape containing knotted phase singularity loops
2005 (English)Report (Other academic)
Abstract [en]

The extension of path-independent 2-D phase unwrapping algorithms, based on placement of branch cut lines between phase singularities of opposite sign, was recently proposed for phase volumes in a recent paper by Huntley. In 3-D the singularities were shown to form closed loops and path-independence was achieved by placing branch cut surfaces across the loops. In the current paper we describe in detail an optimised and extended version of Huntley's algorithm. This deals in particular with two aspects which are essential for practical phase volumes: (1) how to close partial loops which pass through arbitrary boundaries separating valid and invalid phase data, and (2) how to select the set of loops having shortest length. The second algorithm is necessary to deal with the ambiguous cases that can arise when the singularities form knots, i.e. two loops pass through a single phase volume element. The perfomance of the algorithm is demonstrated on 3-D phase maps from two types of medical imaging data: MRI and x-ray interferometry.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2005. p. 25
Series
Research report / Luleå University of Technology, ISSN 1402-1528 ; 2005:16
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-24918 (URN)d0c54e40-b2c3-11db-bf9d-000ea68e967b (Local ID)d0c54e40-b2c3-11db-bf9d-000ea68e967b (Archive number)d0c54e40-b2c3-11db-bf9d-000ea68e967b (OAI)
Note
Godkänd; 2005; 20070202 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Marklund, O. (2002). Method and apparatus for interferometric measurement (ed.). Paper presented at . us US6493092, WO0020824 (A1), EP1117973 (A1), EP1117973 (A0), SE9803326 (L), SE521927 (C2).
Open this publication in new window or tab >>Method and apparatus for interferometric measurement
2002 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

A method for interferometric measurement comprises emitting waves onto a reference surface (1) and onto a measured object (2), which each reflects a part of the emitted waves, and receiving both the reflected parts of the waves by the same receiver (4). In the receiver the parts of the waves generate a representation of the measured object (2) in the form of an interferogram, from which the form of the measured object (2) is determined. The emitted waves comprise waves of three well-defined wavelengths nu1, nu2 and nu3, where nu1<> nu2<> nu3, which wavelengths are chosen to substantially satisfy the mutual relation nu1=(nu2.nu3)/(2.nu3-nu2) and generate an interferogram each in the receiver (4). An apparatus suited to implement the method comprises a light source (3) for emitting light, a reference surface for reflecting a first part of said light, and a receiver (4) which is arranged to receive the first part of the light and a second part of the light, reflected by a measured object (2). The light source is arranged to simultaneously emit light of the three above-mentioned well-defined wavelengths.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:ltu:diva-36871 (URN)8842b260-5144-11db-9592-000ea68e967b (Local ID)8842b260-5144-11db-9592-000ea68e967b (Archive number)8842b260-5144-11db-9592-000ea68e967b (OAI)
Patent
US US6493092, WO0020824 (A1), EP1117973 (A1), EP1117973 (A0), SE9803326 (L), SE521927 (C2) (2002-12-10)
Note

Godkänd; 2002; 20060926 (ysko)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-12-18Bibliographically approved
Birk, W., Medvedev, A. & Marklund, O. (2002). Video monitoring of pulverized coal injection in the blast furnace (ed.). Paper presented at . IEEE transactions on industry applications, 38(2), 571-576
Open this publication in new window or tab >>Video monitoring of pulverized coal injection in the blast furnace
2002 (English)In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 38, no 2, p. 571-576Article in journal (Refereed) Published
Abstract [en]

A novel approach to monitoring and control of the coal powder injection in a blast furnace is presented and discussed. Image analysis of video recordings is used as a means to estimate the instantaneous coal flow. Initial experiments at blast furnace number 3 of SSAB Tunnplat AB, Lulea, Sweden, are reported and firsthand results on modeling and control of a single injection line are given.

National Category
Control Engineering
Research subject
Control Engineering
Identifiers
urn:nbn:se:ltu:diva-16281 (URN)10.1109/28.993181 (DOI)000174631000024 ()2-s2.0-0036506195 (Scopus ID)fe84ed80-644f-11db-8cbe-000ea68e967b (Local ID)fe84ed80-644f-11db-8cbe-000ea68e967b (Archive number)fe84ed80-644f-11db-8cbe-000ea68e967b (OAI)
Note
Validerad; 2002; 20061025 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Marklund, O. (2001). An anisotropic evolution formulation applied in 2-D unwrapping of discontinuous phase surfaces (ed.). Paper presented at . IEEE Transactions on Image Processing, 10(11), 1700-1711
Open this publication in new window or tab >>An anisotropic evolution formulation applied in 2-D unwrapping of discontinuous phase surfaces
2001 (English)In: IEEE Transactions on Image Processing, ISSN 1057-7149, E-ISSN 1941-0042, Vol. 10, no 11, p. 1700-1711Article in journal (Refereed) Published
Abstract [en]

In this paper, a new method to reconstruct piecewise continuous phase estimates using inphase and quadrature components acquired from interferometry measurements is derived and discussed. The method, based on the concept of anisotropic evolution formulations, is shown to be far less noise sensitive than similar methods operating on modulo-mapped data (i.e., traditional phase unwrapping methods). The method is able to produce reliable phase estimates from data containing complex sheared structures in combination with high noise content without relying on user-defined weights.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-4591 (URN)10.1109/83.967398 (DOI)000172386200011 ()18255512 (PubMedID)2-s2.0-0035509768 (Scopus ID)28e42f00-defc-11dc-99e3-000ea68e967b (Local ID)28e42f00-defc-11dc-99e3-000ea68e967b (Archive number)28e42f00-defc-11dc-99e3-000ea68e967b (OAI)
Note
Validerad; 2001; 20080219 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Ehret, P., Felix-Quinonezi, A., Lord, J., Larsson, R. & Marklund, O. (2001). Experimental analysis of micro-elastohydrodynamic lubrication conditions (ed.). In: (Ed.), (Ed.), Proceedings of the International tribology conference: ITC Nagasaki 2000 ; October 29 - November 2, 2000. Paper presented at International Tribology Conference : 29/10/2000 - 02/11/2000. Tokyo: Japanese Society of Tribologsts
Open this publication in new window or tab >>Experimental analysis of micro-elastohydrodynamic lubrication conditions
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2001 (English)In: Proceedings of the International tribology conference: ITC Nagasaki 2000 ; October 29 - November 2, 2000, Tokyo: Japanese Society of Tribologsts , 2001Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Tokyo: Japanese Society of Tribologsts, 2001
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-29489 (URN)2fe8fd80-c0df-11db-834c-000ea68e967b (Local ID)2fe8fd80-c0df-11db-834c-000ea68e967b (Archive number)2fe8fd80-c0df-11db-834c-000ea68e967b (OAI)
Conference
International Tribology Conference : 29/10/2000 - 02/11/2000
Note
Godkänd; 2001; 20070217 (rola)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved
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