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Auto Gaussian & Gabor fits 1.0

  Date Added: July 16, 2013  |  Visits: 218

Auto Gaussian & Gabor fits

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Auto Gaussian & Gabor Surface fit---Functions to fit a 1D Gaussian to a curve and a 2D Gaussian or Gabor to a surface. The routines are automatic in the sense that they do not require the specification of starting guesses for the model parameters. This is done by evaluating the quality of fit for many different choices of parameters then refining the most promising set of params through least-squares (exhaustive search followed by refinement).All functions support 2 methods for computing error bars on the parameters: bootstrapping and MCMC.autoGaussianSurf(xi,yi,zi) fits a 2D Gaussian to a surface, defined as:zi = a*exp(-((xi-x0).^2/2/sigmax^2 + (yi-y0).^2/2/sigmay^2)) + bIt can also fit a tilted 2d Gaussian or isotropic 2d Gaussian.autoGaborSurf(xi,yi,zi) fits a Gabor, defined as:zi = a*exp(-(xip,.^2+yip.^2)/2/sigma^2)*cos(2*pi*xip/lambda + phase) + bWhere:xip = (xi-x0)*cos(theta) + (yi-i0)*sin(theta);yip =-(xi-x0)*sin(theta) + (yi-i0)*cos(theta);The Gabor fit calls autoGaussianSurf internally, using the fact that the absolute value of a Gabor in the Fourier domain is a Gaussian.autoGaussianCurve(xi,zi) fits a 1D Gaussian to a curve.

Requirements: No special requirements
Platforms: Matlab
Keyword: Aexpxix Sigmax Autogaborsurfxiyizi Autogaussiansurfxiyizi Defined Isotropic Methods Phase Support Tilted Yiy Sigmay
Users rating: 0/10

License: Shareware Size: 10 KB
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