[Numpy-discussion] how to get an array with "varying" poisson distribution
Sebastian Haase
haase at msg.ucsf.edu
Mon Jul 24 14:31:46 CDT 2006
Hi,
Essentially I'm looking for the equivalent of what was in numarray:
from numarray import random_array
random_array.poisson(arr)
That is: if for example arr is a 256x256 array of positive integers, then this
returns a new array of random numbers than are drawn according to the poisson
statistics where arr's value at coordinate y,x determines the mean of the
poisson distribution used to generate a new value for y,x.
[[This is needed e.g. to simulate quantum noise in CCD images. Each pixel has
different amount of noise depending of what it's (noise-free) "input" value
was.]]
Thanks,
Sebastian Haase
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