Mercurial > ift6266

annotate transformations/add_background_image.py @ 27:0b9350998dbe

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Added a contrast.py script difining the Contrast transformation class
author Xavier Glorot <glorotxa@iro.umontreal.ca>
date Fri, 29 Jan 2010 14:10:10 -0500
parents 64dac4aabc04
children 4d4248f7e2fb
rev   line source
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bdaa5bd26dcf Added : script to merge a character image with a random background image
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1 #!/usr/bin/python
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2 # -*- coding: iso-8859-1 -*-
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3 # usage : add_background_image.py "image_name"
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4 # Chooses a random image in "image_dir" and set a random crop of it as a background to the character image "image_name" given as argument
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5
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6 ##################
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7 # import libraries
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8 ##################
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9
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10 import sys, os, random, fnmatch
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11 import Image
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12
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13 ###########
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14 # variables
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15 ###########
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16 # don't forget the "/" at the end of directories
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17
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18 if len(sys.argv) < 2:
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19 print "No argument, exiting"
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20 sys.exit()
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21
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22 char_image = sys.argv[1]
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64dac4aabc04 Added in background script : character pixel inversion (from black to white, for dark backgrounds)
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23 image_dir = "./images/"
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24 pattern = "*.jpg"
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25 invert = False
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26 threshold = 100;
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27
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28 ###########
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29 # functions
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30 ###########
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31
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32 # make a random 32x32 crop of image "image" and returns the new image_dir
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33 def rand_crop(image):
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34 w, h = image.size
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35 x, y = random.randint(1,w - 32), random.randint(1,h - 32)
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36
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37 return image.crop((x, y, x + 32, y + 32))
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38
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39 # select a random image from "image_dir" and crops it
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40 def rand_image():
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41 files = os.listdir(image_dir)
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42 image_files = fnmatch.filter(files, pattern)
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43 i = random.randint(0, len(image_files) - 1)
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44
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45 image = Image.open(image_dir + image_files[i]).convert("L")
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46
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47 return rand_crop(image)
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48
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49
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50 # set "bg_image" as background to "image", based on a pixels threshold
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51 def set_bg(image, bg_image, threshold):
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52 pix = image.load()
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53 bg_pix = bg_image.load()
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54
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55 for x in range(1, 32):
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56 for y in range(1, 32):
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57 if pix[x, y] > threshold:
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58 pix[x, y] = bg_pix[x, y]
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64dac4aabc04 Added in background script : character pixel inversion (from black to white, for dark backgrounds)
Guillaume Sicard <guitch21@gmail.com>
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59 elif invert:
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60 pix[x, y] = 255 - pix[x, y]
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61
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62 return image
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63
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64 ######
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65 # main
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66 ######
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67
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68 sys.stdout.write("Applying background to " + char_image + " with threshold " + str(threshold) + "... ")
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69 sys.stdout.flush()
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70
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71 image = Image.open(char_image).convert("L")
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72
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73 bg_image = rand_image()
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74
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75 image = set_bg(image, bg_image, threshold)
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76
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77 image.save(char_image + "-bg.jpg")
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78 #image.show()
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79
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80 sys.stdout.write(" Done.\n")