PoissonNoise:

Path: Imaging/Utilities

% Smear the pixels with poisson noise.
 Smear a pixelmap with Poisson shot noise. Shot noise operates on the
 number of electrons. It is a type of noise that can be modeled as a Poisson
 process. If b is not entered it will use 5% of the max pixel count.

 The default scaling is for an 8 bit discretization. The conversion to
 counts, excluding noise, is f*p + b. To convert counts back to the original
 intensity, (p - b)/f.
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   Form:
   p = PoissonNoise( pixels, f, b)
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   ------
   Inputs
   ------
   pixels    (m,n)     Pixelmap
   f         (1,1)     Convert from pixelmap units to counts.
   b         (1,1)     Flat background, in counts, to apply before shot noise

   -------
   Outputs
   -------
   p         (m,n)     Pixels as counts with noise
   f         (1,1)     Pixelmap conversion used.
   b         (1,1)     Flat background used.

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