view pycaptcha/transformations.py @ 125:5d3a7a4e30e9

little changes in Rature and occlusion to fit with visualisation
author Xavier Glorot <glorotxa@iro.umontreal.ca>
date Thu, 18 Feb 2010 12:58:34 -0500
parents 4775b4195b4b
children
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import Numeric, Image
    #""" Transforme une image PIL en objet numpy.array et vice versa"""


def image2array(im):
    #""" image vers array numpy"""
    if im.mode not in ("L", "F"):
        raise ValueError, "can only convert single-layer images"
    if im.mode == "L":
        a = Numeric.fromstring(im.tostring(), Numeric.UnsignedInt8)
    else:
        a = Numeric.fromstring(im.tostring(), Numeric.Float32)
    a.shape = im.size[1], im.size[0]
    return a

def array2image(a):
    #""" array numpy vers image"""
    if a.typecode() == Numeric.UnsignedInt8:
        mode = "L"
    elif a.typecode() == Numeric.Float32:
        mode = "F"
    else:
        raise ValueError, "unsupported image mode"
    return Image.fromstring(mode, (a.shape[1], a.shape[0]), a.tostring())