Mercurial > ift6266

annotate data_generation/transformations/pycaptcha/transformations.py @ 625:128bc92897f2

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Script to generate resized version of mnist in two different ways: rescaling and zeropadding
author Salah Rifai <salahmeister@gmail.com>
date Wed, 16 Mar 2011 00:05:39 -0400
parents 1f5937e9e530
children
rev   line source
87
4775b4195b4b code pour la generation de captchas
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1
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2 import Numeric, Image
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3 #""" Transforme une image PIL en objet numpy.array et vice versa"""
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6 def image2array(im):
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7 #""" image vers array numpy"""
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8 if im.mode not in ("L", "F"):
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9 raise ValueError, "can only convert single-layer images"
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10 if im.mode == "L":
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11 a = Numeric.fromstring(im.tostring(), Numeric.UnsignedInt8)
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12 else:
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13 a = Numeric.fromstring(im.tostring(), Numeric.Float32)
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14 a.shape = im.size[1], im.size[0]
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15 return a
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16
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17 def array2image(a):
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18 #""" array numpy vers image"""
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19 if a.typecode() == Numeric.UnsignedInt8:
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20 mode = "L"
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21 elif a.typecode() == Numeric.Float32:
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22 mode = "F"
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23 else:
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24 raise ValueError, "unsupported image mode"
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25 return Image.fromstring(mode, (a.shape[1], a.shape[0]), a.tostring())