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BeamSpread
[RowSigma,ColSigma] = BeamSpread(Img,RelThresh,N,DisplayPlot)
Computes beam spread in 2 axes (image row and column) given input image. Beam spread is quantified as least squares fit for Sigma with Gaussian form $exp(-0.5(x/sigma)^2)$. Image is averaged down rows and across columns, normalized to the peak, and fit is made to normalized irradiance above RelThresh. If there is an input for N that is greater than 0, it is interpolated over N points, centered about the centroid. Fit can be displayed by setting DisplayPlot=1.
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Parameters |
Description |
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Img [matrix] |
Average beam irradiance (arbitrary units) or a grid structure with fields .x, .y and .g |
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RelThresh [scalar] |
Attenuation relative to the peak for Gaussian fit |
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N [scalar] |
(Optional) Number of points for irradiance interpolation |
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DisplayPlot [scalar] |
(Optional) Option (1/0) to display plot of row and column fit. Default is FALSE. |
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Return Values |
Description |
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RowSigma [scalar] |
Fit of beam irradiance in image row axis (pixels/units of .y) |
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ColSigma [scalar] |
Fit of beam irradiance in image column axis (pixels/units of .x) |
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Description