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Träfflista för sökning "WFRF:(Åström Karl) "

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1.	Eriksson, Anders P, et al. (author) On the bijectivity of thin-plate splines 2012 In: Analysis for Science, Engineering and Beyond, The Tribute Workshop in Honour of Gunnar Sparr held in Lund, May 8-9, 2008. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 9783642202360 - 9783642202353 ; 6, s. 93-141 Book chapter (other academic/artistic)abstract The thin-plate spline (TPS) has been widely used in a number of areas such as image warping, shape analysis and scattered data interpolation. Introduced by Bookstein (IEEE Trans. Pattern Anal. Mach. Intell. 11(6):567–585 1989), it is a natural interpolating function in two dimensions, parameterized by a finite number of landmarks. However, even though the thin-plate spline has a very intuitive interpretation as well as an elegant mathematical formulation, it has no inherent restriction to prevent folding, i.e. a non-bijective interpolating function. In this chapter we discuss some of the properties of the set of parameterizations that form bijective thin-plate splines, such as convexity and boundness. Methods for finding sufficient as well as necessary conditions for bijectivity are also presented. The methods are used in two settings (a) to register two images using thin-plate spline deformations, while ensuring bijectivity and (b) group-wise registration of a set of images, while enforcing bijectivity constraints.
2.	Karlsson, Johan, et al. (author) Shape Modeling by Optimising Description Length Using Gradients and Parameterisation Invariance 2012 In: Analysis for Science, Engineering and Beyond, The Tribute Workshop in Honour of Gunnar Sparr held in Lund, May 8-9, 2008. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 9783642202353 - 9783642202360 ; 6, s. 51-91 Book chapter (other academic/artistic)abstract In Statistical Shape Modeling, a dense correspondence between the shapes in the training set must be established. Traditionally this has been done by hand, a process that commonly requires a lot of work and is difficult, especially in 3D. In recent years there has been a lot of work on automatic construction of Shape Models. In recent papers (Davies et al., Medical Image Computing and Computer-Assisted Intervention MICCAI’2001, pp. 57–65, 2001; Davies et al., IEEE Trans. Med. Imaging. 21(5):525–537 2002; Kotcheff and Taylor, Med. Image Anal. 2:303–314 1998) Minimum Description Length, (MDL), is used to locate a dense correspondence between shapes. In this paper the gradient of the description length is derived. Using the gradient, MDL is optimised using steepest descent. The optimisation is therefore faster and experiments show that the resulting models are better. To characterise shape properties that are invariant to similarity transformations, it is first necessary to normalise with respect to the similarity transformations. This is normally done using Procrustes analysis. In this paper we propose to align shapes using the MDL criterion. The MDL based algorithm is compared to Procrustes on a number of data sets. It is concluded that there is improvement in generalisation when using MDL to align the shapes. In this paper novel theory to prevent the commonly occurring problem of clustering under correspondence optimisation is also presented. The problem is solved by calculating the covariance matrix of the shapes using a scalar product that is invariant to mutual reparameterisations. An algorithm for implementing the ideas is proposed and compared to Thodberg’s state of the art algorithm for automatic shape modeling. The suggested algorithm is more stable and the resulting models are of higher quality according to the generalisation measure and according to visual inspection of the specificity.
3.	Åström, Karl, et al. (author) A PC Implementation of a PID Regulator 1983 Reports (other academic/artistic)
4.	Analysis for Science, Engineering and Beyond The Tribute Workshop in Honour of Gunnar Sparr held in Lund, May 8-9, 2008 2012 Editorial collection (peer-reviewed)
5.	Andersson, Ulf, et al. (author) Path design and control algorithms for articulated mobile robots 1997 In: Proceedings of the International Conference on Field and Service Robotics. ; , s. 405-411 Conference paper (peer-reviewed)
6.	Färnström, Fredrik, et al. (author) Computer Vision for determination of Fridge Content 2002 In: Proceedings SSAB'02, Symposium on Image Analysis. ; , s. 45-48 Conference paper (other academic/artistic)
7.	James, B., et al. (author) Multivariable controller tuning 1998 In: Proc. 17th American Control Conference. Conference paper (peer-reviewed)
8.	James, B., et al. (author) Multivariable Controller Tuning—Some Preliminary Results 1997 Conference paper (peer-reviewed)
9.	Johansson, Karl Henrik, et al. (author) An Automatic Startup Procedure for Multivariable Control Systems 1994 Conference paper (peer-reviewed)
10.	Johansson, Karl H., et al. (author) Limit cycles with chattering in relay feedback systems 1997 Conference paper (peer-reviewed)

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Type of publication: conference paper (366); reports (229); journal article (178); book chapter (58); book (22); editorial collection (4); show more...; editorial proceedings (4); other publication (4); doctoral thesis (3); licentiate thesis (3); patent (3); show less...

Type of content: peer-reviewed (512); other academic/artistic (357); pop. science, debate, etc. (5)

Author/Editor: Åström, Karl Johan (648); Åström, Karl (205); Hägglund, Tore (69); Oskarsson, Magnus (39); Heyden, Anders (38); Wittenmark, Björn (35); show more...; Kuang, Yubin (26); Kahl, Fredrik (24); Burgess, Simon (13); Ardö, Håkan (12); Mattsson, Sven Erik (12); Byröd, Martin (12); Berthilsson, Rikard (11); Edenbrandt, Lars (9); Johansson, Karl Henr ... (9); Panagopoulos, Helene (9); Ericsson, Anders (9); de Wit, Carlos Canud ... (9); Josephson, Klas (8); Enqvist, Olof (8); Olsson, Gustaf (8); Åström, Kalle (7); Robertsson, Anders (7); Nilsson, Mikael (7); Olsson, Henrik (7); Overgaard, Niels Chr ... (7); Jiang, Fangyuan (7); Bernhardsson, Bo (6); Soltesz, Kristian (6); Ask, Erik (6); Eriksson, Anders P (6); Sparr, Gunnar (6); Berner, Josefin (6); Turner, Kimberly L. (6); Karlsson, Karl-Göran (6); Palmér, Tobias (6); Dormido, Sebastián (6); Guzmán, José Luis (6); Johansson, Rolf (5); Årzén, Karl-Erik (5); Persson, Per (5); Hagander, Per (5); Karlsson, Johan (5); Nugues, Pierre (5); Nielsen, Lars (5); Helmersson, Anders (5); Evander, Eva (5); Holst, Holger (5); Furuta, Katsuhisa (5); Piguet, Yves (5); show less...

University: Lund University (853); Royal Institute of Technology (9); Linköping University (8); Umeå University (6); Mid Sweden University (5); Luleå University of Technology (3); show more...; Chalmers University of Technology (3); University of Gothenburg (2); Uppsala University (2); Swedish University of Agricultural Sciences (2); Halmstad University (1); Stockholm University (1); Mälardalen University (1); Swedish Environmental Protection Agency (1); Karolinska Institutet (1); show less...

Language: English (818); Swedish (54); Russian (1); Spanish (1)

Research subject (UKÄ/SCB): Engineering and Technology (671); Natural sciences (188); Medical and Health Sciences (11); Social Sciences (10); Agricultural Sciences (2)

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