PSFTOLSF Convert a line spread function to a point spread function
lsf = PSFTOLSF(psf,varargin)

This works by convolving a horizontal line with a psf and returning the  
vertical slice through the center.  The spatial support of the lsf is  
equal to the spatial support of the vertical slice through the passed  
psf.  The passed psf should be square.  
The returned lsf is normalized to have a peak amplitude of 1.  
See also LSFTOPSF.  
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