Mercurial Hosting > traffic-intelligence
annotate python/calibration-translation.py @ 157:3aab19947a34
added utility to recalibrate images with similar viewpoints
author | Nicolas Saunier <nicolas.saunier@polymtl.ca> |
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date | Thu, 08 Sep 2011 19:25:02 -0400 |
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children | 2d7c6d767a39 |
rev | line source |
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1 #!/usr/bin/env python |
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2 |
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3 import sys |
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4 |
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5 import matplotlib.mlab as pylab |
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6 import matplotlib.pyplot as plt |
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7 import numpy as np |
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8 |
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9 import cv2 |
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10 import utils |
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11 import cvutils |
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12 |
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13 # development for the data collected and stabilized by Paul in Summer 2011 |
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14 # todo test other features |
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15 |
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16 options = utils.parseCLIOptions('Program to re-calibrate an initial calibration based on point correspondences by adjusting the points to slightly different viewpoints, where all the points are still visible\n\nUsage: ', ['ref_video=', 'ref_homography=', 'ref_points='], sys.argv, ['mask_img=']) |
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17 |
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18 referenceVideoFilename=options['--ref_video']#'1440-1459_Mercalli.avi' |
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19 referenceHomographyFilename=options['--ref_homography']#'1440-1459_Mercalli-homography.txt' |
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20 points = np.loadtxt(options['--ref_points'], dtype=np.float32) # '1440-1459_Mercalli-point-correspondences.txt' |
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21 wldPts = points[:2,:].T |
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22 imgPts = points[2:,:].T |
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23 |
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24 def translatePoints(points, t): |
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25 'points is Nx2, t is [x,y]' |
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26 translated = points.copy() |
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27 for i in xrange(2): |
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28 translated[i] += t[i] |
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29 return translated |
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30 |
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31 filenames = [f for f in utils.listfiles('.','avi')] # directory to examine should be current directory |
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32 |
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33 referenceHomography = np.loadtxt(referenceHomographyFilename) |
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34 referenceVideoIndex = filenames.index(referenceVideoFilename) |
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35 indices = set(range(len(filenames))) |
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36 indices.discard(referenceVideoIndex) |
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37 |
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38 images = {} |
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39 #features = {} |
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40 captures = {} |
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41 |
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42 captures[referenceVideoFilename] = cv2.VideoCapture(referenceVideoFilename) |
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43 (ret, img) = captures[referenceVideoFilename].read() |
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44 images[referenceVideoFilename] = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY) |
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45 |
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46 if '--mask_img' in options.keys(): |
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47 maskImg = cv2.imread('mask.png', cv2.CV_LOAD_IMAGE_GRAYSCALE) # todo add possibility to look in the whole image if not providing mask |
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48 else: |
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49 maskImg = np.ones(images[referenceVideoFilename].shape, dtype=np.uint8) |
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50 |
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51 referenceFeatures = cv2.goodFeaturesToTrack(images[referenceVideoFilename], 1000, 0.02, 2, useHarrisDetector = True, mask=maskImg) |
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52 displayRef = cv2.cvtColor(images[referenceVideoFilename], cv2.COLOR_GRAY2RGB) |
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53 for j,p in enumerate(imgPts): |
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54 cv2.circle(displayRef, tuple(p), 3, (255,0,0)) |
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55 cv2.putText(displayRef, str(j+1), tuple(p), cv2.FONT_HERSHEY_PLAIN, 1, (255,0,0)) |
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56 cv2.imshow('Reference',displayRef) |
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57 |
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58 key = -1 |
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59 for f in filenames: # get suitable image references for each video |
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60 captures[f] = cv2.VideoCapture(f) |
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61 while key != cvutils.cvKeyNumbers['y']: |
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62 (ret, img) = captures[f].read() |
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63 cv2.imshow('Image',img) |
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64 print('Can one see the reference points in the image? (y/n)') |
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65 key = cv2.waitKey(0) |
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66 |
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67 images[f] = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY) |
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68 cv2.imwrite(utils.removeExtension(filenames[i])+'-frame.png') |
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69 #images[f] = cv2.imread(f, cv2.CV_LOAD_IMAGE_GRAYSCALE) |
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70 #features[f] = cv2.goodFeaturesToTrack(images[f], 1000, 0.02, 2, useHarrisDetector = True, mask=maskImg) # todo put parameters on the command line ? |
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71 # goodFeaturesToTrack(image, maxCorners, qualityLevel, minDistance[, corners[, mask[, blockSize[, useHarrisDetector[, k]]]]]) |
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72 # display features |
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73 if False: |
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74 display = img.copy()#cv2.cvtColor(images[f], cv2.COLOR_GRAY2RGB) #.copy() |
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75 for p in features[f]: |
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76 cv2.circle(display, tuple(p[0]), 3, (255,0,0)) |
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77 cv2.imshow('Reference',display) |
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78 cv2.waitKey() |
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79 |
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80 plt.close('all') |
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81 |
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82 for i in indices: |
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83 t = cvutils.computeTranslation(images[filenames[referenceVideoIndex]], images[filenames[i]], referenceFeatures, 100, 10) |
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84 print filenames[i],t |
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85 key = -1 |
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86 if t != None: # show translated points and ask if ok |
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87 displayImg = cv2.cvtColor(images[filenames[i]], cv2.COLOR_GRAY2RGB) #.copy() |
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88 for p in imgPts: |
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89 cv2.circle(displayImg, tuple(p+t[0]), 3, (255,0,0)) |
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90 cv2.imshow('Image',displayImg) |
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91 |
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92 while key != cvutils.cvKeyNumbers['y'] and key != cvutils.cvKeyNumbers['n']: |
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93 print('Are the translated points rightly located (y/n)?') |
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94 key = cv2.waitKey(0) |
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95 if key == cvutils.cvKeyNumbers['y']: # compute homography with translated numbers |
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96 newImgPts = [p+t[0] for p in imgPts] |
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97 else: |
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98 print('No translation could be found automatically. You will have to manually input world reference points.') |
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99 |
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100 if t==None or key != cvutils.cvKeyNumbers['y']:# if no translation could computed or it is not satisfactory |
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101 # image should be right to get points |
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102 # todo save image |
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103 print('Select the corresponding points in the same order as in the reference image') |
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104 plt.figure(1) |
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105 plt.imshow(displayRef) |
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106 plt.figure(2) |
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107 plt.imshow(img) |
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108 plt.show() |
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109 newImgPts = np.array([list(p) for p in plt.ginput(n=wldPts.shape[0], timeout=-1)], dtype = np.float32) |
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110 |
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111 homography, mask = cv2.findHomography(newImgPts, wldPts) # method=0, ransacReprojThreshold=3 |
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112 print homography |
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113 np.savetxt(utils.removeExtension(filenames[i])+'-homography.txt',homography) |
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114 np.savetxt(utils.removeExtension(filenames[i])+'-point-correspondences.txt', append(wldPts.T, newImgPts.T, axis=0)) |
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115 |
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116 cv2.destroyAllWindows() |