[Numpy-discussion] adaptive thresholding: get adacent cells for each pixel (original) (raw)
stephen emslie stephenemslie at gmail.com
Fri Jun 9 21:34:36 EDT 2006
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I'm just starting with numpy (via scipy) and I'm wanting to perform adaptive thresholding (http://www.cee.hw.ac.uk/hipr/html/adpthrsh.html) on an image. Basically that means that I need to get a threshold for each pixel by examining the pixels around it. In numpy this translates to finding the adjacent cells for each cell (not including the value of the cell we are examining) and getting the mean, or median of those cells.
I've written something that works, but is terribly slow. How would someone with more experience get the adjacent cells for each cell minus the cell being examined?
Thanks Stephen Emslie
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