[Image-SIG] PIL - 1.1.6, Centroid
fredrik at pythonware.com
Mon Aug 25 20:58:36 CEST 2008
Ashish Asgekar wrote:
> I was looking for Centroid function in Python and downloaded
> PIL-1.1.6. I learnt that Centroid function is available as Crack Code.
> However, when I search for CrackCode, I find it is not available anymore
> from PythonWare.
> 1) Is CrackCode available in PIL-1.1.6 in some
> other form?
the CrackCode extension is no longer available, for licensing reasons.
> 2) Can I compute Centroid of an image using some other
> existing function?
assuming that "im" contains a single feature (represented by non-zero
pixels), the following function should do the trick:
sx = sy = n = 0
x0, y0, x1, y1 = im.getbbox()
pix = im.load()
for y in range(y0, y1):
for x in range(x0, x1):
if pix[x, y]:
sx += x
sy += y
n += 1
return float(sx) / n + 0.5, float(sy) / n + 0.5
on my machine, the above can process about fourty 512x512 grayscale
images per second.
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