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comparison python/cvutils.py @ 657:51269511229b

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added script printing video info
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Wed, 13 May 2015 17:24:19 +0200
parents 4e7925cb4f8f
children 6668f541b915
comparison
equal deleted inserted replaced
656:2813d74b3635 657:51269511229b
34 return chr(key&255)== 'q' or chr(key&255) == 'Q' 34 return chr(key&255)== 'q' or chr(key&255) == 'Q'
35 35
36 def saveKey(key): 36 def saveKey(key):
37 return chr(key&255) == 's' 37 return chr(key&255) == 's'
38 38
39 def int2FOURCC(x):
40 fourcc = ''
41 for i in xrange(4):
42 fourcc += unichr((x >> 8*i)&255)
43 return fourcc
44
39 def plotLines(filename, origins, destinations, w = 1, resultFilename='image.png'): 45 def plotLines(filename, origins, destinations, w = 1, resultFilename='image.png'):
40 '''Draws lines over the image ''' 46 '''Draws lines over the image '''
41 import Image, ImageDraw # PIL 47 import Image, ImageDraw # PIL
42 48
43 img = Image.open(filename) 49 img = Image.open(filename)
117 newCameraMatrix = deepcopy(intrinsicCameraMatrix) 123 newCameraMatrix = deepcopy(intrinsicCameraMatrix)
118 newCameraMatrix[0,2] = newImgSize[0]/2. 124 newCameraMatrix[0,2] = newImgSize[0]/2.
119 newCameraMatrix[1,2] = newImgSize[1]/2. 125 newCameraMatrix[1,2] = newImgSize[1]/2.
120 return cv2.initUndistortRectifyMap(intrinsicCameraMatrix, array(distortionCoefficients), identity(3), newCameraMatrix, newImgSize, cv2.CV_32FC1) 126 return cv2.initUndistortRectifyMap(intrinsicCameraMatrix, array(distortionCoefficients), identity(3), newCameraMatrix, newImgSize, cv2.CV_32FC1)
121 127
122 def playVideo(filename, firstFrameNum = 0, frameRate = -1, interactive = False, printFrames = True, text = None, rescale = 1.): 128 def playVideo(filename, firstFrameNum = 0, frameRate = -1, interactive = False, printFrames = True, text = None, rescale = 1., step = 1):
123 '''Plays the video''' 129 '''Plays the video'''
124 windowName = 'frame' 130 windowName = 'frame'
125 cv2.namedWindow(windowName, cv2.WINDOW_NORMAL) 131 cv2.namedWindow(windowName, cv2.WINDOW_NORMAL)
126 wait = 5 132 wait = 5
127 if frameRate > 0: 133 if frameRate > 0:
133 key = -1 139 key = -1
134 ret = True 140 ret = True
135 frameNum = firstFrameNum 141 frameNum = firstFrameNum
136 capture.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrameNum) 142 capture.set(cv2.cv.CV_CAP_PROP_POS_FRAMES, firstFrameNum)
137 while ret and not quitKey(key): 143 while ret and not quitKey(key):
138 ret, img = capture.read() 144 #ret, img = capture.read()
145 for i in xrange(step):
146 ret, img = capture.read()
139 if ret: 147 if ret:
140 if printFrames: 148 if printFrames:
141 print('frame {0}'.format(frameNum)) 149 print('frame {0}'.format(frameNum))
142 frameNum+=1 150 frameNum+=step
143 if text is not None: 151 if text is not None:
144 cv2.putText(img, text, (10,50), cv2.cv.CV_FONT_HERSHEY_PLAIN, 1, cvRed) 152 cv2.putText(img, text, (10,50), cv2.cv.CV_FONT_HERSHEY_PLAIN, 1, cvRed)
145 cvImshow(windowName, img, rescale) 153 cvImshow(windowName, img, rescale)
146 key = cv2.waitKey(wait) 154 key = cv2.waitKey(wait)
147 if saveKey(key): 155 if saveKey(key):
148 cv2.imwrite('image-{}.png'.format(frameNum), img) 156 cv2.imwrite('image-{}.png'.format(frameNum), img)
149 cv2.destroyAllWindows() 157 cv2.destroyAllWindows()
158 else:
159 print('Video capture for {} failed'.format(filename))
160
161 def infoVideo(filename):
162 '''Provides all available info on video '''
163 cvPropertyNames = {cv2.cv.CV_CAP_PROP_FORMAT: "format",
164 cv2.cv.CV_CAP_PROP_FOURCC: "codec (fourcc)",
165 cv2.cv.CV_CAP_PROP_FPS: "fps",
166 cv2.cv.CV_CAP_PROP_FRAME_COUNT: "number of frames",
167 cv2.cv.CV_CAP_PROP_FRAME_HEIGHT: "heigh",
168 cv2.cv.CV_CAP_PROP_FRAME_WIDTH: "width",
169 cv2.cv.CV_CAP_PROP_RECTIFICATION: "rectification",
170 cv2.cv.CV_CAP_PROP_SATURATION: "saturation"}
171 capture = cv2.VideoCapture(filename)
172 if capture.isOpened():
173 for cvprop in [#cv2.cv.CV_CAP_PROP_BRIGHTNESS
174 #cv2.cv.CV_CAP_PROP_CONTRAST
175 #cv2.cv.CV_CAP_PROP_CONVERT_RGB
176 #cv2.cv.CV_CAP_PROP_EXPOSURE
177 cv2.cv.CV_CAP_PROP_FORMAT,
178 cv2.cv.CV_CAP_PROP_FOURCC,
179 cv2.cv.CV_CAP_PROP_FPS,
180 cv2.cv.CV_CAP_PROP_FRAME_COUNT,
181 cv2.cv.CV_CAP_PROP_FRAME_HEIGHT,
182 cv2.cv.CV_CAP_PROP_FRAME_WIDTH,
183 #cv2.cv.CV_CAP_PROP_GAIN,
184 #cv2.cv.CV_CAP_PROP_HUE
185 #cv2.cv.CV_CAP_PROP_MODE
186 #cv2.cv.CV_CAP_PROP_POS_AVI_RATIO
187 #cv2.cv.CV_CAP_PROP_POS_FRAMES
188 #cv2.cv.CV_CAP_PROP_POS_MSEC
189 #cv2.cv.CV_CAP_PROP_RECTIFICATION,
190 #cv2.cv.CV_CAP_PROP_SATURATION
191 ]:
192 prop = capture.get(cvprop)
193 if cvprop == cv2.cv.CV_CAP_PROP_FOURCC and prop > 0:
194 prop = int2FOURCC(int(prop))
195 print('Video {}: {}'.format(cvPropertyNames[cvprop], prop))
150 else: 196 else:
151 print('Video capture for {} failed'.format(filename)) 197 print('Video capture for {} failed'.format(filename))
152 198
153 def getImagesFromVideo(videoFilename, firstFrameNum = 0, nFrames = 1, saveImage = False, outputPrefix = 'image'): 199 def getImagesFromVideo(videoFilename, firstFrameNum = 0, nFrames = 1, saveImage = False, outputPrefix = 'image'):
154 '''Returns nFrames images from the video sequence''' 200 '''Returns nFrames images from the video sequence'''