Mercurial > ift6266

annotate transformations/affine_transform.py @ 57:6846136b2201

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add a simple test script to see transformation step by step
author Xavier Glorot <glorotxa@iro.umontreal.ca>
date Sun, 07 Feb 2010 23:29:05 -0500
parents d9d836d3c625
children 859ebd7f8754
rev   line source
39
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
1 #!/usr/bin/python
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
2 # coding: utf-8
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
3
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
4 '''
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
5 Simple implementation of random affine transformations based on the Python
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
6 Imaging Module affine transformations.
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
7
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
8
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
9 Author: Razvan Pascanu
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
10 '''
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
11
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
12 import numpy, Image
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
13
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
14
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
15
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
16 class AffineTransformation():
51
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
17 def __init__( self, complexity = .5):
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
18 self.shape = (32,32)
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
19 self.rng = numpy.random.RandomState()
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
20 self.complexity = complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
21 params = self.rng.uniform(size=6) -.5
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
22 self.a = 1. + params[0]*.4*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
23 self.b = 0. + params[1]*.4*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
24 self.c = params[2]*8.*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
25 self.d = 0. + params[3]*.4*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
26 self.e = 1. + params[4]*.4*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
27 self.f = params[5]*8.*complexity
39
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
28
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
29
56
d9d836d3c625 Change in affine_transform to handle float images
Xavier Glorot <glorotxa@iro.umontreal.ca>
parents: 51
diff changeset
30 def _get_current_parameters(self):
d9d836d3c625 Change in affine_transform to handle float images
Xavier Glorot <glorotxa@iro.umontreal.ca>
parents: 51
diff changeset
31 return [self.a, self.b, self.c, self.d, self.e, self.f]
51
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
32
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
33 def get_settings_names(self):
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
34 return ['a','b','c','d','e','f']
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
35
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
36 def regenerate_parameters(self, complexity):
39
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
37 # generate random affine transformation
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
38 # a point (x',y') of the new image corresponds to (x,y) of the old
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
39 # image where :
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
40 # x' = params[0]*x + params[1]*y + params[2]
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
41 # y' = params[3]*x + params[4]*y _ params[5]
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
42
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
43 # the ranges are set manually as to look acceptable
51
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
44
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
45 self.complexity = complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
46 params = self.rng.uniform(size=6) -.5
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
47 self.a = 1. + params[0]*.4*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
48 self.b = 0. + params[1]*.4*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
49 self.c = params[2]*8.*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
50 self.d = 0. + params[3]*.4*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
51 self.e = 1. + params[4]*.4*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
52 self.f = params[5]*8.*complexity
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
53 return self._get_current_parameters()
39
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
54
51
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
55
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
56
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
57
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
58 def transform_image(self,NIST_image):
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
59
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
60 im = Image.fromarray( \
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
61 numpy.asarray(\
56
d9d836d3c625 Change in affine_transform to handle float images
Xavier Glorot <glorotxa@iro.umontreal.ca>
parents: 51
diff changeset
62 NIST_image.reshape(self.shape)*255.0, dtype='uint8'))
51
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
63 nwim = im.transform( (32,32), Image.AFFINE, [self.a,self.b,self.c,self.d,self.e,self.f])
56
d9d836d3c625 Change in affine_transform to handle float images
Xavier Glorot <glorotxa@iro.umontreal.ca>
parents: 51
diff changeset
64 return numpy.asarray(nwim)/255.0
39
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
65
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
66
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
67
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
68 if __name__ =='__main__':
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
69 print 'random test'
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
70
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
71 from pylearn.io import filetensor as ft
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
72 import pylab
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
73
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
74 datapath = '/data/lisa/data/nist/by_class/'
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
75
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
76 f = open(datapath+'digits/digits_train_data.ft')
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
77 d = ft.read(f)
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
78 f.close()
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
79
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
80
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
81 transformer = AffineTransformation()
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
82 id = numpy.random.randint(30)
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
83
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
84 pylab.figure()
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
85 pylab.imshow(d[id].reshape((32,32)))
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
86 pylab.figure()
51
81b9567ec4ae transformation ready for pipeline
Razvan Pascanu <r.pascanu@gmail.com>
parents: 39
diff changeset
87 pylab.imshow(transformer.transform_image(d[id]).reshape((32,32)))
39
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
88
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
89 pylab.show()
17caecc92544 affine transformation using PIL
Razvan Pascanu <r.pascanu@gmail.com>
parents:
diff changeset
90