Mercurial > ift6266

annotate data_generation/transformations/contrast.py @ 266:1e4e60ddadb1

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Merge. Ah, et dans le dernier commit, j'avais oublié de mentionner que j'ai ajouté du code pour gérer l'isolation de différents clones pour rouler des expériences et modifier le code en même temps.
author fsavard
date Fri, 19 Mar 2010 10:56:16 -0400
parents 1f5937e9e530
children
rev   line source
27
0b9350998dbe Added a contrast.py script difining the Contrast transformation class
Xavier Glorot <glorotxa@iro.umontreal.ca>
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1 #!/usr/bin/python
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2 # coding: utf-8
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3
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Xavier Glorot <glorotxa@iro.umontreal.ca>
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4 '''
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5 Simple implementation of random contrast. This always switch half the time the polarity.
31
7ef8aac2cdb5 comment change and useless import removed for contrast.py
Xavier Glorot <glorotxa@iro.umontreal.ca>
parents: 27
diff changeset
6 then it decides of a random contrast dependant of the complexity, the mean of the maximum and minimum
7ef8aac2cdb5 comment change and useless import removed for contrast.py
Xavier Glorot <glorotxa@iro.umontreal.ca>
parents: 27
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7 pixel value stays 0 (to avoid import bias change between exemples).
27
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8
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9 Author: Xavier Glorot
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10 '''
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11
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12 import numpy as N
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13 import copy
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14
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15
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Xavier Glorot <glorotxa@iro.umontreal.ca>
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16 class Contrast():
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17 def __init__(self,complexity = 1):
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18 #---------- private attributes
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19 self.__nx__ = 32 #xdim of the images
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20 self.__ny__ = 32 #ydim of the images
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21 self.__Pinvert__ = 0.5 #probability to switch polarity
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22 self.__mincontrast__ = 0.15
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23 self.__resolution__ = 256
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24 self.__rangecontrastres__ = self.__resolution__ - N.int(self.__mincontrast__*self.__resolution__)
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25 #------------------------------------------------
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26
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27 #---------- generation parameters
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28 self.regenerate_parameters(complexity)
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29 #------------------------------------------------
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30
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31 def _get_current_parameters(self):
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32 return [self.invert,self.contrast]
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33
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34 def get_settings_names(self):
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35 return ['invert','contrast']
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36
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37 def regenerate_parameters(self, complexity):
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38 self.invert = (N.random.uniform() < self.__Pinvert__)
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39 self.contrast = self.__resolution__ - N.random.randint(1 + self.__rangecontrastres__ * complexity)
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40 return self._get_current_parameters()
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41
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42 def transform_1_image(self,image): #the real transformation method
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43 maxi = image.max()
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44 mini = image.min()
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45 if self.invert:
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46 newimage = 1 - (self.__resolution__- self.contrast) / (2 * float(self.__resolution__)) -\
0b9350998dbe Added a contrast.py script difining the Contrast transformation class
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47 (image - mini) / float(maxi - mini) * self.contrast / float(self.__resolution__)
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48 else:
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49 newimage = (self.__resolution__- self.contrast) / (2 * float(self.__resolution__)) +\
0b9350998dbe Added a contrast.py script difining the Contrast transformation class
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parents:
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50 (image - mini) / float(maxi - mini) * self.contrast / float(self.__resolution__)
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51 if image.dtype == 'uint8':
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52 return N.asarray(newimage*255,dtype='uint8')
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53 else:
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54 return N.asarray(newimage,dtype=image.dtype)
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55
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56 def transform_image(self,image): #handling different format
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57 if image.shape == (self.__nx__,self.__ny__):
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58 return self.transform_1_image(image)
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parents:
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59 if image.ndim == 3:
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parents:
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60 newimage = copy.copy(image)
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61 for i in range(image.shape[0]):
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parents:
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62 newimage[i,:,:] = self.transform_1_image(image[i,:,:])
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63 return newimage
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parents:
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64 if image.ndim == 2 and image.shape != (self.__nx__,self.__ny__):
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parents:
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65 newimage = N.reshape(image,(image.shape[0],self.__nx__,self.__ny__))
0b9350998dbe Added a contrast.py script difining the Contrast transformation class
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parents:
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66 for i in range(image.shape[0]):
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parents:
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67 newimage[i,:,:] = self.transform_1_image(newimage[i,:,:])
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parents:
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68 return N.reshape(newimage,image.shape)
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Xavier Glorot <glorotxa@iro.umontreal.ca>
parents:
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69 if image.ndim == 1:
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Xavier Glorot <glorotxa@iro.umontreal.ca>
parents:
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70 newimage = N.reshape(image,(self.__nx__,self.__ny__))
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parents:
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71 newimage = self.transform_1_image(newimage)
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72 return N.reshape(newimage,image.shape)
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parents:
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73 assert False #should never go there
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parents:
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74
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parents:
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75
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parents:
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76
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parents:
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77
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78 #test on NIST (you need pylearn and access to NIST to do that)
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parents:
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79
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80 if __name__ == '__main__':
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parents:
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81
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parents:
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82 from pylearn.io import filetensor as ft
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parents:
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83 import copy
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parents:
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84 import pygame
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parents:
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85 import time
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Xavier Glorot <glorotxa@iro.umontreal.ca>
parents:
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86 datapath = '/data/lisa/data/nist/by_class/'
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parents:
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87 f = open(datapath+'digits/digits_train_data.ft')
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parents:
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88 d = ft.read(f)
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parents:
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89
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parents:
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90 pygame.surfarray.use_arraytype('numpy')
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parents:
diff changeset
91
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92 pygame.display.init()
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parents:
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93 screen = pygame.display.set_mode((8*2*32,8*32),0,8)
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Xavier Glorot <glorotxa@iro.umontreal.ca>
parents:
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94 anglcolorpalette=[(x,x,x) for x in xrange(0,256)]
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parents:
diff changeset
95 screen.set_palette(anglcolorpalette)
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parents:
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96
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parents:
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97 MyContrast = Contrast()
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parents:
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98
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99 debut=time.time()
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parents:
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100 MyContrast.transform_image(d)
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101 fin=time.time()
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parents:
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102 print '------------------------------------------------'
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parents:
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103 print d.shape[0],' images transformed in :', fin-debut, ' seconds'
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parents:
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104 print '------------------------------------------------'
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parents:
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105 print (fin-debut)/d.shape[0]*1000000,' microseconds per image'
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parents:
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106 print '------------------------------------------------'
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parents:
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107 print MyContrast.get_settings_names()
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parents:
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108 print MyContrast._get_current_parameters()
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parents:
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109 print MyContrast.regenerate_parameters(0)
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parents:
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110 print MyContrast.regenerate_parameters(0.5)
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parents:
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111 print MyContrast.regenerate_parameters(1)
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parents:
diff changeset
112 for i in range(10000):
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113 a=d[i,:]
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parents:
diff changeset
114 b=N.asarray(N.reshape(a,(32,32))).T
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parents:
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115
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parents:
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116 new=pygame.surfarray.make_surface(b)
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parents:
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117 new=pygame.transform.scale2x(new)
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parents:
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118 new=pygame.transform.scale2x(new)
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parents:
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119 new=pygame.transform.scale2x(new)
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120 new.set_palette(anglcolorpalette)
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parents:
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121 screen.blit(new,(0,0))
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parents:
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122
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parents:
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123 print MyContrast.get_settings_names(), MyContrast.regenerate_parameters(1)
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parents:
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124 c=MyContrast.transform_image(a)
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parents:
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125 b=N.asarray(N.reshape(c,(32,32))).T
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parents:
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126
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parents:
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127 new=pygame.surfarray.make_surface(b)
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128 new=pygame.transform.scale2x(new)
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129 new=pygame.transform.scale2x(new)
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130 new=pygame.transform.scale2x(new)
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131 new.set_palette(anglcolorpalette)
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132 screen.blit(new,(8*32,0))
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133
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134 pygame.display.update()
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135 raw_input('Press Enter')
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parents:
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136
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137 pygame.display.quit()