Per-Erik Danielsson

Per-Erik Danielsson graduated from Royal Institute of Technology in Stockholm (M.Sc.1960, Tech.Lic.1967). He has been a professor of Computer engineering and Image processing at Linköping University since 1971 and was head of the Image Processing Laboratory until 2001. His present research areas are tomographic image reconstruction and segmentation of 3D-volume data. He is a member of the Swedish Academy of Engineering Science, a fellow of International Association for Pattern Recognition, and in 1982 he was awarded the degree of Doctor h.c. for promoting education in computer engineering.

Research Interests

My interest in image analysis dates back to the early 70’s when the conventional computer was unsuited to process digital images due to their sheer data volume. Thus, my background in hardware and parallel computing seemed to match the needs in the image processing field. Gradually, however, I became more engaged in the algorithms themselves and in 1989, the last hardware project called PICAP III was phased out from my group. At the same time my interest in image reconstruction began to grow, much due to the late professor Paul Edholm, who became a part time member of the Image Processing Laboratory. When scanning the list of projects below, please notice that projects in areas like robot vision, distance transforms and computer graphics, that I no longer pursue, are omitted. As of today I try to keep a certain foothold in the following partly overlapping areas.

Computer tomography and image reconstruction
2D and 3D image analysis based on derivative operators
Medical imaging and image analysis

Adresses

Office:

Linköping University
CVL Laboratory, Dept. of EE
SE 581 83 Linköping
Tel. +46 13 281306 Fax +46 13 138526
ped@isy.liu.se

Home:

Hedborns gata 30
SE 584 37 Linköping
Tel. +46 13 172672
danielsson.per-erik@telia.com

Previous and ongoing projects

Tomography projects completed 1990-2000

Investigation and implementation of Fast Fourier methods for medical 2D-tomography [1], [2]
Investigation and application of fast Fourier methods for medical 3D (cone-beam) tomography [3],[4]
An industrial application for linear tomography [5], [6]
Investigation of fast back-projection [7], [8]

Projects completed after 2000

(1996-2001) The PI-method for helical cone-beam tomography [9], [10], [11]
(2000-2003) Tomographic volume scanning of wood. A feasibility study [12], [13], [14]
(1998-2003) Derivative based operators from medical image analysis [15], [16], [17]
(2002-2003) 3D-luggage scanning. A feasibility study.

Ongoing projects

Combining analytical and iterative reconstruction techniques for CT [18], [19]
The virtual tomograph [20]

References

[1]	M.B. Magnusson (Seger), P-E. Danielsson, P.R. Edholm, Artefacts and remedies in Direct Fourier Methods, IEEE 1992 Med. Imaging Conf., Orlando, Florida, Oct. 27-31, 1992
[2]	M.B. Magnusson (Seger), Linogram and other direct Fourier methods for tomographic reconstruction, Linköping Studies in Science and Technology, Dissertations, No 320, 1993
[3]	P-E. Danielsson, From cone-beam projections to 3D Radon data in O(N³ log N) time, IEEE 1992 Med. Imaging Conf., Orlando, Florida, Oct. 27-31, 1992
[4]	C. Jacobson, Fourier methods in 3D reconstruction from cone-beam data, Linköping Studies in Science and Technology, Dissertations, No 427, 1996
[5]	M. Magnusson Seger,
[6]	M. Magnusson Seger,
[7]	P-E. Danielsson, Iterative techniques for projection and back-projection, Tech. report LiTH-ISY-R-1997, Linköping University, SE-581 83 Linköping
[8]	M. Ingerhed, Fast back-projection in computer tomography, Implementation and evaluation, Linköping Studies in Science and Technology, Thesis (Licentiate) No 759, 1999
[9]	P-E. Danielsson, P. Edholm, J. Eriksson, M. Magnusson Seger, H. Turbell, Technique and arrangement for tomographic imaging, International Application Published under the Patent Cooperation Treaty (PCT), WO 98/30980, July 16, 1998. Also as appendix A in J. Eriksson, Problems and Experiments in Cone-beam Tomography, Linköping Studies in Science and Technology, Thesis (Licentiate) No 710, 1998
[10]	H. Turbell and P-E. Danielsson, Helical cone-beam tomography, Int. Journal of Imaging Systems and Technology, Vol. 11, pp 91-100, 2000
[11]	H. Turbell, Cone-beam reconstruction using filtered back-projection, Linköping Studies in Science and Technology, Dissertations, No 672, 2001
[12]	P-E. Danielsson, Cone beam scanning of logs. A feasibility study. Overview and summary of final report. Dept of EE, Linköping University, June 2001 (electronic copy)
[13]	M. Magnusson Seger and P-E. Danielsson, Scanning of logs with cone-beam tomography, Computers and Electronics in Agriculture, Vol 41, pp 45-62, 2003 (electronic copy)
[14]	K. Flood, Segmentation of knots. A problem in 3D X-ray scanning of logs, Linköping Studies in Science and Technology, Thesis (Licentiate) No 1007, 2003
[15]	P-E. Danielsson and Qingfen Lin, Efficient detection of second-degree variations in 2D and 3D images, Journal of Visual Communication and Image Representation, vol 12, pp 255-305, (2001) (electronic and corrected copy)
[16]	P-E. Danielsson and Q. Lin, A new shape space for second order 3D-variations, in C.Arcelli et al (Eds.) Visual Form 2001, LNCS 2059, pp 145-154, 2001
[17]	Q. Lin, Enhancement, extraction, and visualization of 3D volume data, Linköping Studies in Science and Technology, Dissertations, No 824, 2003
[18]	P-E. Danielsson, Metod för bildförbättring i datortomografi, Swedish patent, C2 520708, filed Dec.3, 2001, approved, Aug. 12, 2003
[19]	P-E. Danielsson and M. Magnusson Seger, A Proposal for Combining FBP and ART in CT-reconstruction, in Abstracts for 2003 Meeting on Fully 3D-reconstruction, St Malo, June 30-July 4, 2003 (electronic copy)
[20]	Michael Sandborg et al, Image quality and radiation dose in computerised tomography (CT). The virtual tomograph - a tool for optimisation, Research plan, 2003 (electronic copy)