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comparison python/cvutils.py @ 203:e2f31813ade6

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added code to display trajectories on videa
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Tue, 06 Mar 2012 18:10:19 -0500
parents 8e7b354666ec
children 966c2cd2bd9f
comparison
equal deleted inserted replaced
202:b0b964ba9489 203:e2f31813ade6
83 for i in range(cvmat.rows): 83 for i in range(cvmat.rows):
84 for j in range(cvmat.cols): 84 for j in range(cvmat.cols):
85 cvmat[i,j] = a[i,j] 85 cvmat[i,j] = a[i,j]
86 return cvmat 86 return cvmat
87 87
88 def draw(img, positions, color, lastCoordinate = None):
89 last = lastCoordinate+1
90 if lastCoordinate != None and lastCoordinate >=0:
91 last = min(positions.length()-1, lastCoordinate)
92 for i in range(0, last-1):
93 cv2.line(img, positions[i].astuple(), positions[i+1].astuple(), color)
94
88 def playVideo(filename): 95 def playVideo(filename):
89 '''Plays the video''' 96 '''Plays the video'''
90 capture = cv2.VideoCapture(filename) 97 capture = cv2.VideoCapture(filename)
91 if capture.isOpened(): 98 if capture.isOpened():
92 key = -1 99 key = -1
93 while key!= 1048689: # 'q' 100 while key!= 113: # 'q'
94 ret, img = capture.read() 101 ret, img = capture.read()
95 if ret: 102 if ret:
96 cv2.imshow('frame', img) 103 cv2.imshow('frame', img)
97 key = cv2.waitKey(5) 104 key = cv2.waitKey(5)
98 105
108 ret, img = capture.read() 115 ret, img = capture.read()
109 if img.size>0: 116 if img.size>0:
110 images.append(img) 117 images.append(img)
111 return images 118 return images
112 119
120 def displayTrajectories(videoFilename, objects, homography = None):
121 '''Displays the objects overlaid frame by frame over the video '''
122 capture = cv2.VideoCapture(videoFilename)
123 if capture.isOpened():
124 key = -1
125 frameNum = 1
126 while key!= 113: # 'q'
127 ret, img = capture.read()
128 if ret:
129 print(frameNum)
130 for obj in objects:
131 if obj.existsAtInstant(frameNum):
132 #obj.getTimeInterval()
133 if homography != None and obj.getFirstInstant() == frameNum:
134 obj.projectedPositions = obj.positions.project(homography)
135 draw(img, obj.projectedPositions, cvRed, frameNum-obj.getFirstInstant())
136 cv2.imshow('frame', img)
137 key = cv2.waitKey(50)
138 frameNum += 1
139
113 def printCvMat(cvmat, out = stdout): 140 def printCvMat(cvmat, out = stdout):
114 '''Prints the cvmat to out''' 141 '''Prints the cvmat to out'''
115 for i in xrange(cvmat.rows): 142 for i in xrange(cvmat.rows):
116 for j in xrange(cvmat.cols): 143 for j in xrange(cvmat.cols):
117 out.write('{0} '.format(cvmat[i,j])) 144 out.write('{0} '.format(cvmat[i,j]))