DocumentCode :
2490574
Title :
Multi-scale optical flow including normalized mutual information for planar deformable lung motion estimation from 4D CT
Author :
Negahdar, Mohammadreza ; Amini, Amir A.
Author_Institution :
Electr. & Comput. Eng. Dept., Univ. of Louisville, Louisville, KY, USA
fYear :
2011
fDate :
Aug. 30 2011-Sept. 3 2011
Firstpage :
4888
Lastpage :
4892
Abstract :
A novel energy function for computing planar optical flow from X-ray CT images was presented and reported in detail in [1]. The technique combines four terms: brightness constancy, gradient constancy, continuity equation based on mass conservation, and discontinuity-preserving spatio-temporal smoothness. Both qualitative and quantitative evaluation of the proposed method demonstrated that the method results in significantly better angular errors than previous well-known techniques for optical flow estimation. A multi-scale approach to motion field computation based on this framework is presented in this paper. The proposed approach significantly speeds up the calculations, realizing computational savings. Additionally, an approach to determination of optimum values of scalar weights in the energy function is herein proposed. Normalized mutual information measured between the first image warped with the estimated motion and the second image is used to determine the optimum value for weighting parameters.
Keywords :
computerised tomography; lung; medical image processing; motion estimation; 4D CT; X-ray CT images; brightness constancy; computational savings; continuity equation; discontinuity preserving spatiotemporal smoothness; energy function; gradient constancy; mass conservation; multiscale optical flow; normalized mutual information; planar deformable lung motion estimation; Biomedical optical imaging; Computed tomography; Computer vision; Image motion analysis; Lungs; Optical imaging; Vectors; Humans; Lung; Models, Theoretical; Tomography, X-Ray Computed;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Engineering in Medicine and Biology Society, EMBC, 2011 Annual International Conference of the IEEE
Conference_Location :
Boston, MA
ISSN :
1557-170X
Print_ISBN :
978-1-4244-4121-1
Electronic_ISBN :
1557-170X
Type :
conf
DOI :
10.1109/IEMBS.2011.6091211
Filename :
6091211
Link To Document :
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