axroPSF.py

import numpy as np
import utilities.imaging.man as man
import scatter
from conicsolve import primrad,primfocus,woltparam

def computeHEW(x0,psf):
    """
    Compute the HEW from a PSF via the CDF method
    """
    dx2 = np.diff(x0)[0]
    cdf = np.cumsum(psf)*dx2
    hpdPSF = x0[np.argmin(np.abs(cdf-.75))]-\
             x0[np.argmin(np.abs(cdf-.25))]
    return hpdPSF

def primary2DPSF(img,dx,R0=220.,Z0=8400.,x0=np.linspace(-5.,5.,1001)):
    """
    Create height vector and radius img based on
    radial distortion input data.
    Then pass to a F2PY scattering function to
    compute PSF over observation points.
    """
    #Remove NaNs if they exist
    img = man.stripnans(img)
    #Create height vector
    graze = woltparam(R0,Z0)[0]
    foc = primfocus(R0,Z0)
    z = np.arange(np.shape(img)[0])*dx*np.cos(graze)+Z0
    #Create radial position img
    rad = primrad(z,R0,Z0)
    rad2 = np.flipud(np.transpose(np.tile(rad,(np.shape(img)[1],1))))
    distortion = np.transpose(rad2-img/1e3)
    z = z[::-1]
    #Compute length for each slice
    length = np.array([(np.sum(~np.isnan(li))-1)*dx \
                       for li in distortion],order='F')
    DR = length*np.sin(graze)
    #Integrate each slice in Fortran
    psf = scatter.primarypsf(distortion,z-8400.,length,x0,1.24e-6,foc,R0,graze)
    print time.time()-tstart
    
    return psf