Authors: Bob Dougherty (firstname.lastname@example.org) Orderd by by Bill Mohler. Installation: Download Helmholtz_Analysis.class to the Plugins folder and restart ImageJ. Source: Helmholtz_Analysis.java Description: ImageJ plugin to estimate the wavelength distribution of an image with periodic features, as well as the orientation of the structures. The 2D Helmholtz equation is applied to estimate the wavenumber, k = 2*pi/lambda. Developed as a Custom ImageJ Plugin for Bill Mohler for application to images of muscle tissue. The original name of the plugin was Muscle Tone. See also helmholtz.pdf. Reference: "Measurement of muscle disease by quantitative second-harmonic generation imaging," S.V Plotnikov, A.M. Kenny, S.J. Walsh, B. Zubrowski, C. Joseph, V.L. Scranton, V.A. Kuchel., D. Dauser, M. Xu, C.C. Pilbeam, D.J. Adams, R.P. Dougherty, P.J. Campagnola and W.A. Mohler, J. Biomed. Opt., 2008, Jul-Aug;13(4):044018.
Input image Dialog Output Average output History: August 2005: First version of Muscle Tone
October 11, 2011: Renamed Helmholtz Analysis and posted.
Version 1. October 12, 2011. Fixed a bug that caused incorrect averages and sometimes array index out of bounds crashes for non-square images.
Version 2. October 15, 2011. Hardwired choices for filtering radii and averaging tolerances. Added checkboxes to select outputs. Added support for ROIs. Added progress bar for averaging. Improved handling on invalid points. Weighted average for phi.
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