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annotate python/cvutils.py @ 150:404f3cade05f
added python function to get image frames from video filenames
author | Nicolas Saunier <nicolas.saunier@polymtl.ca> |
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date | Thu, 01 Sep 2011 18:37:35 -0400 |
parents | 0f552c8b1650 |
children | 4af774bb186d |
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28 | 1 #! /usr/bin/env python |
2 '''Image/Video utilities''' | |
3 | |
4 import Image, ImageDraw # PIL | |
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5 try: |
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6 import cv,cv2 |
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7 opencvExists = True |
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8 except ImportError: |
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9 print('OpenCV library could not be loaded') |
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10 opencvExists = False |
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11 from sys import stdout |
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12 |
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13 #import aggdraw # agg on top of PIL (antialiased drawing) |
28 | 14 #import utils |
15 | |
16 __metaclass__ = type | |
17 | |
18 def drawLines(filename, origins, destinations, w = 1, resultFilename='image.png'): | |
19 '''Draws lines over the image ''' | |
20 | |
21 img = Image.open(filename) | |
22 | |
23 draw = ImageDraw.Draw(img) | |
24 #draw = aggdraw.Draw(img) | |
25 #pen = aggdraw.Pen("red", width) | |
26 for p1, p2 in zip(origins, destinations): | |
27 draw.line([p1.x, p1.y, p2.x, p2.y], width = w, fill = (256,0,0)) | |
28 #draw.line([p1.x, p1.y, p2.x, p2.y], pen) | |
29 del draw | |
30 | |
31 #out = utils.openCheck(resultFilename) | |
32 img.save(resultFilename) | |
33 | |
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34 def computeHomography(srcPoints, dstPoints, method=0, ransacReprojThreshold=0.0): |
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35 '''Returns the homography matrix mapping from srcPoints to dstPoints (dimension Nx2)''' |
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36 cvSrcPoints = arrayToCvMat(srcPoints); |
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37 cvDstPoints = arrayToCvMat(dstPoints); |
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38 H = cv.CreateMat(3, 3, cv.CV_64FC1) |
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39 cv.FindHomography(cvSrcPoints, cvDstPoints, H, method, ransacReprojThreshold) |
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40 return H |
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41 |
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42 def cvMatToArray(cvmat): |
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43 '''Converts an OpenCV CvMat to numpy array.''' |
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44 from numpy.core.multiarray import zeros |
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45 a = zeros((cvmat.rows, cvmat.cols))#array([[0.0]*cvmat.width]*cvmat.height) |
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46 for i in xrange(cvmat.rows): |
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47 for j in xrange(cvmat.cols): |
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48 a[i,j] = cvmat[i,j] |
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49 return a |
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50 |
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51 if opencvExists: |
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52 def arrayToCvMat(a, t = cv.CV_64FC1): |
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53 '''Converts a numpy array to an OpenCV CvMat, with default type CV_64FC1.''' |
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54 cvmat = cv.CreateMat(a.shape[0], a.shape[1], t) |
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55 for i in range(cvmat.rows): |
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56 for j in range(cvmat.cols): |
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57 cvmat[i,j] = a[i,j] |
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58 return cvmat |
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59 |
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60 def playVideo(filename): |
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61 '''Plays the video''' |
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62 capture = cv2.VideoCapture(filename) |
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63 if capture.isOpened(): |
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64 key = -1 |
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65 while key!= 1048689: # 'q' |
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66 ret, img = capture.read() |
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67 if ret: |
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68 cv2.imshow('frame', img) |
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69 key = cv2.waitKey(5) |
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70 |
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71 def getImagesFromVideo(filename, nImages = 1): |
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72 '''Returns nImages images from the video sequence''' |
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73 images = [] |
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74 capture = cv2.VideoCapture(filename) |
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75 if capture.isOpened(): |
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76 ret = False |
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77 while len(images)<nImages: |
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78 while not ret: |
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79 ret, img = capture.read() |
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80 if img.size>0: |
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81 images.append(img) |
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82 return images |
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83 |
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84 def printCvMat(cvmat, out = stdout): |
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85 '''Prints the cvmat to out''' |
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86 for i in xrange(cvmat.rows): |
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87 for j in xrange(cvmat.cols): |
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88 out.write('{0} '.format(cvmat[i,j])) |
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89 out.write('\n') |
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90 |
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91 def projectArray(homography, points): |
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92 '''Returns the coordinates of the projected points (format 2xN points) |
28 | 93 through homography''' |
94 from numpy.core._dotblas import dot | |
95 from numpy.core.multiarray import array | |
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96 from numpy.lib.function_base import append |
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97 |
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98 if points.shape[0] != 2: |
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99 raise Exception('points of dimension {0} {1}'.format(points.shape[0], points.shape[1])) |
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100 |
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101 if (homography!=None) and homography.size>0: |
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102 augmentedPoints = append(points,[[1]*points.shape[1]], 0) |
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103 prod = dot(homography, augmentedPoints) |
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104 return prod[0:2]/prod[2] |
28 | 105 else: |
106 return p | |
107 | |
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108 def project(homography, p): |
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109 '''Returns the coordinates of the projection of the point p |
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110 through homography''' |
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111 from numpy.core.multiarray import array |
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112 return projectArray(homography, array([[p[0]],p[1]])) |
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113 |
28 | 114 def projectTrajectory(homography, trajectory): |
115 '''Projects a series of points in the format | |
116 [[x1, x2, ...], | |
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117 [y1, y2, ...]]''' |
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118 from numpy.core.multiarray import array |
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119 return projectArray(homography, array(trajectory)) |
28 | 120 |
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121 def invertHomography(homography): |
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122 'Returns an inverted homography' |
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123 from numpy.linalg.linalg import inv |
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124 invH = inv(homography) |
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125 invH /= invH[2,2] |
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126 return invH |
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127 |
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128 if opencvExists: |
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129 def computeTranslation(img1, img2, img1Points, maxTranslation, minNMatches, windowSize = (5,5), level = 5, criteria = (cv.CV_TERMCRIT_EPS, 0, 0.01)): |
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130 '''Computes the translation between of img2 with respect to img1 |
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131 (loaded using OpenCV) |
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132 img1Points are used to compute the translation |
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133 |
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134 TODO add diagnostic if data is all over the place, and it most likely is not a translation (eg zoom)''' |
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135 from numpy.core.multiarray import zeros |
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136 from numpy.lib.function_base import median |
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137 |
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138 (img2Points, status, track_error) = cv.CalcOpticalFlowPyrLK(img1, img2, zeros((img1.rows,img1.cols+8)), zeros((img1.rows,img1.cols+8)), img1Points, windowSize, level, criteria, 0) |
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139 |
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140 deltaX = [] |
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141 deltaY = [] |
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142 for (k, (p1,p2)) in enumerate(zip(img1Points, img2Points)): |
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143 if status[k] == 1: |
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144 dx = p2[0]-p1[0] |
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145 dy = p2[1]-p1[1] |
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146 d = dx**2 + dy**2 |
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147 if d < maxTranslation: |
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148 deltaX.append(dx) |
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149 deltaY.append(dy) |
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150 if len(deltaX) >= 10: |
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151 return [median(deltaX), median(deltaY)] |
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152 else: |
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153 return None |