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comparison python/cvutils.py @ 231:249d65ff6c35

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merged modifications for windows
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Mon, 02 Jul 2012 23:49:39 -0400
parents b7612c6d5702
children ab1a11176d7b
comparison
equal deleted inserted replaced
230:bc4ea09b1743 231:249d65ff6c35
88 def draw(img, positions, color, lastCoordinate = None): 88 def draw(img, positions, color, lastCoordinate = None):
89 last = lastCoordinate+1 89 last = lastCoordinate+1
90 if lastCoordinate != None and lastCoordinate >=0: 90 if lastCoordinate != None and lastCoordinate >=0:
91 last = min(positions.length()-1, lastCoordinate) 91 last = min(positions.length()-1, lastCoordinate)
92 for i in range(0, last-1): 92 for i in range(0, last-1):
93 cv2.line(img, positions[i].astuple(), positions[i+1].astuple(), color) 93 cv2.line(img, positions[i].asint().astuple(), positions[i+1].asint().astuple(), color)
94 94
95 def playVideo(filename): 95 def playVideo(filename, firstFrameNum = 0):
96 '''Plays the video''' 96 '''Plays the video'''
97 capture = cv2.VideoCapture(filename) 97 capture = cv2.VideoCapture(filename)
98 if capture.isOpened(): 98 if capture.isOpened():
99 key = -1 99 key = -1
100 while key!= 113: # 'q' 100 ret = True
101 frameNum = firstFrameNum
102 capture.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrameNum)
103 while ret and key!= 113: # 'q'
101 ret, img = capture.read() 104 ret, img = capture.read()
102 if ret: 105 if ret:
106 print('frame {0}'.format(frameNum))
107 frameNum+=1
103 cv2.imshow('frame', img) 108 cv2.imshow('frame', img)
104 key = cv2.waitKey(5) 109 key = cv2.waitKey(5)
105 110
106 def getImagesFromVideo(filename, nImages = 1): 111 def getImagesFromVideo(filename, nImages = 1, saveImage = False):
107 '''Returns nImages images from the video sequence''' 112 '''Returns nImages images from the video sequence'''
108 images = [] 113 images = []
109 capture = cv2.VideoCapture(filename) 114 capture = cv2.VideoCapture(filename)
110 if capture.isOpened(): 115 if capture.isOpened():
111 ret = False 116 ret = False
112 while len(images)<nImages: 117 numImg = 0
118 while numImg<nImages:
113 ret, img = capture.read() 119 ret, img = capture.read()
114 while not ret: 120 i = 0
121 while not ret and i<10:
115 ret, img = capture.read() 122 ret, img = capture.read()
123 i += 1
116 if img.size>0: 124 if img.size>0:
117 images.append(img) 125 numImg +=1
126 if saveImage:
127 cv2.imwrite('image{0:04d}.png'.format(numImg), img)
128 else:
129 images.append(img)
118 return images 130 return images
119 131
120 def displayTrajectories(videoFilename, objects, homography = None): 132 def displayTrajectories(videoFilename, objects, homography = None, firstFrameNum = 0):
121 '''Displays the objects overlaid frame by frame over the video ''' 133 '''Displays the objects overlaid frame by frame over the video '''
122 capture = cv2.VideoCapture(videoFilename) 134 capture = cv2.VideoCapture(videoFilename)
123 if capture.isOpened(): 135 if capture.isOpened():
124 key = -1 136 key = -1
125 frameNum = 1 137 ret = True
126 while key!= 113: # 'q' 138 frameNum = firstFrameNum
139 capture.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrameNum)
140 while ret and key!= 113: # 'q'
141 print('capture')
127 ret, img = capture.read() 142 ret, img = capture.read()
128 if ret: 143 if ret:
129 print(frameNum) 144 print('frame {0}'.format(frameNum))
130 for obj in objects: 145 for obj in objects:
131 if obj.existsAtInstant(frameNum): 146 if obj.existsAtInstant(frameNum):
132 #obj.getTimeInterval() 147 if obj.getFirstInstant() == frameNum:
133 if homography != None and obj.getFirstInstant() == frameNum: 148 if homography != None:
134 obj.projectedPositions = obj.positions.project(homography) 149 obj.projectedPositions = obj.positions.project(homography)
150 else:
151 obj.projectedPositions = obj.positions
135 draw(img, obj.projectedPositions, cvRed, frameNum-obj.getFirstInstant()) 152 draw(img, obj.projectedPositions, cvRed, frameNum-obj.getFirstInstant())
136 cv2.putText(img, '{0}'.format(obj.num), obj.projectedPositions[frameNum-obj.getFirstInstant()].astuple(), cv2.FONT_HERSHEY_PLAIN, 1, cvRed) 153 cv2.putText(img, '{0}'.format(obj.num), obj.projectedPositions[frameNum-obj.getFirstInstant()].asint().astuple(), cv2.FONT_HERSHEY_PLAIN, 1, cvRed)
137 cv2.imshow('frame', img) 154 cv2.imshow('frame', img)
138 key = cv2.waitKey(50) 155 key = cv2.waitKey(50)
139 frameNum += 1 156 frameNum += 1
140 157
141 def printCvMat(cvmat, out = stdout): 158 def printCvMat(cvmat, out = stdout):