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comparison python/cvutils.py @ 305:ca9131968bce

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added sample to replay video
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Fri, 29 Mar 2013 21:20:12 -0400
parents 514f6b98cd8c
children 82b9be447608
comparison
equal deleted inserted replaced
304:20f9cd972dde 305:ca9131968bce
22 cvBlue = (255,0,0) 22 cvBlue = (255,0,0)
23 cvColors = utils.PlottingPropertyValues([cvRed, 23 cvColors = utils.PlottingPropertyValues([cvRed,
24 cvGreen, 24 cvGreen,
25 cvBlue]) 25 cvBlue])
26 26
27 def quitKey(key):
28 return chr(key&255)== 'q' or chr(key&255) == 'Q'
29
30 def saveKey(key):
31 return chr(key&255) == 's'
32
27 def drawLines(filename, origins, destinations, w = 1, resultFilename='image.png'): 33 def drawLines(filename, origins, destinations, w = 1, resultFilename='image.png'):
28 '''Draws lines over the image ''' 34 '''Draws lines over the image '''
29 35
30 img = Image.open(filename) 36 img = Image.open(filename)
31 37
83 if lastCoordinate != None and lastCoordinate >=0: 89 if lastCoordinate != None and lastCoordinate >=0:
84 last = min(positions.length()-1, lastCoordinate) 90 last = min(positions.length()-1, lastCoordinate)
85 for i in range(0, last-1): 91 for i in range(0, last-1):
86 cv2.line(img, positions[i].asint().astuple(), positions[i+1].asint().astuple(), color) 92 cv2.line(img, positions[i].asint().astuple(), positions[i+1].asint().astuple(), color)
87 93
88 def playVideo(filename, firstFrameNum = 0): 94 def playVideo(filename, firstFrameNum = 0, frameRate = -1):
89 '''Plays the video''' 95 '''Plays the video'''
96 wait = 5
97 if frameRate > 0:
98 wait = int(round(1000./frameRate))
90 capture = cv2.VideoCapture(filename) 99 capture = cv2.VideoCapture(filename)
91 if capture.isOpened(): 100 if capture.isOpened():
92 key = -1 101 key = -1
93 ret = True 102 ret = True
94 frameNum = firstFrameNum 103 frameNum = firstFrameNum
95 capture.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrameNum) 104 capture.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrameNum)
96 while ret and chr(key&255)!= 'q': 105 while ret and not quitKey(key):
97 ret, img = capture.read() 106 ret, img = capture.read()
98 if ret: 107 if ret:
99 print('frame {0}'.format(frameNum)) 108 print('frame {0}'.format(frameNum))
100 frameNum+=1 109 frameNum+=1
101 cv2.imshow('frame', img) 110 cv2.imshow('frame', img)
102 key = cv2.waitKey(5) 111 key = cv2.waitKey(wait)
103 112
104 def getImagesFromVideo(filename, nImages = 1, saveImage = False): 113 def getImagesFromVideo(filename, nImages = 1, saveImage = False):
105 '''Returns nImages images from the video sequence''' 114 '''Returns nImages images from the video sequence'''
106 images = [] 115 images = []
107 capture = cv2.VideoCapture(filename) 116 capture = cv2.VideoCapture(filename)
133 if not lastFrameNumArg: 142 if not lastFrameNumArg:
134 from sys import maxint 143 from sys import maxint
135 lastFrameNum = maxint 144 lastFrameNum = maxint
136 else: 145 else:
137 lastFrameNum = lastFrameNumArg 146 lastFrameNum = lastFrameNumArg
138 while ret and chr(key&255)!= 'q' and chr(key&255)!= 'Q' and frameNum < lastFrameNum: 147 while ret and not quitKey(key) and frameNum < lastFrameNum:
139 ret, img = capture.read() 148 ret, img = capture.read()
140 if ret: 149 if ret:
141 print('frame {0}'.format(frameNum)) 150 print('frame {0}'.format(frameNum))
142 for obj in objects: 151 for obj in objects:
143 if obj.existsAtInstant(frameNum): 152 if obj.existsAtInstant(frameNum):
148 obj.projectedPositions = obj.positions 157 obj.projectedPositions = obj.positions
149 draw(img, obj.projectedPositions, cvRed, frameNum-obj.getFirstInstant()) 158 draw(img, obj.projectedPositions, cvRed, frameNum-obj.getFirstInstant())
150 cv2.putText(img, '{0}'.format(obj.num), obj.projectedPositions[frameNum-obj.getFirstInstant()].asint().astuple(), cv2.FONT_HERSHEY_PLAIN, 1, cvRed) 159 cv2.putText(img, '{0}'.format(obj.num), obj.projectedPositions[frameNum-obj.getFirstInstant()].asint().astuple(), cv2.FONT_HERSHEY_PLAIN, 1, cvRed)
151 cv2.imshow('frame', img) 160 cv2.imshow('frame', img)
152 key = cv2.waitKey() 161 key = cv2.waitKey()
153 if chr(key&255) == 's': 162 if saveKey(key):
154 cv2.imwrite('image.png', img) 163 cv2.imwrite('image.png', img)
155 frameNum += 1 164 frameNum += 1
156 165
157 def printCvMat(cvmat, out = stdout): 166 def printCvMat(cvmat, out = stdout):
158 '''Prints the cvmat to out''' 167 '''Prints the cvmat to out'''