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Intramodal registration
Robust, high-quality registration of two volumes. They are aligned according to a least-squares criterion, which is well-suited to intramodal registration tasks. Several deformation models are available:
1) Translation (it is possible to specify along which axes);
2) Rotation (it is possible to specify around which axes);
3) Isometric scaling;
4) Any combination of 1-3;
5) Affine transformation (which can be restricted to some dimensions if desired; a typical restriction would happen when registering images instead of volumes);
6) Contrast adjustment (experimental, can be disengaged).

Robustness is achieved by the use of a multiresolution approach.
High-quality results from the use of cubic-spline interpolation.

This tool is provided as a set of ANSI-C sources, which means it is NOT plug-and-play. Programmation skills are required to attach the ANSI-C routine to whichever system you happen to use.

You'll be free to use this software for research purposes, but you
should not redistribute it without our consent. In addition, we expect
you to include a citation or acknowlegment whenever you present or
publish results that are based on it.
NIfTI-1 support
Philippe Thévenaz
How to get
Current version
Current version release date
April 8, 2002
Open source
Available free of charge
ANSI-C compiler + any external image-processing package to which C-libraries can be attached
Technical publications
P. Thévenaz and M. Unser, "A Pyramid Approach to Subpixel Registration Based on Intensity," IEEE Transactions on Image Processing, vol. 7, no. 1, pp. 27-41, January 1998.

P. Thévenaz, U.E. Ruttimann and M. Unser, "Iterative Multi-Scale Registration without Landmarks," Proc. IEEE Int. Conf. on Image Processing, Washington, DC, USA, October 23-26, 1995, vol. III, pp. 228-231.

M. Unser, A. Aldroubi and C.R. Gerfen, "A Multiresolution Image Registration Procedure Using Spline Pyramids," Proc. SPIE, San Diego, CA, USA, July 15-16, 1993, vol. 2034, Mathematical Imaging: Wavelet Applications in Signal and Image Processing, pp. 160-170.
Applications publications
Other information
intramodal, registration, spline, volume, warping
(Any), HPUX, IDL, IRIX, Linux, MacOS, MATLAB, SunOS, UNIX, Windows
IATR listing last updated
24 Sep 2005