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comparison python/moving.py @ 562:259ccb3dd962

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work on object trajectory smoothing
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Wed, 16 Jul 2014 02:12:34 -0400
parents f13220f765e0
children 072cedc3f33d
comparison
equal deleted inserted replaced
561:ee45c6eb6d49 562:259ccb3dd962
874 874
875 def predictPosition(self, instant, nTimeSteps, externalAcceleration = Point(0,0)): 875 def predictPosition(self, instant, nTimeSteps, externalAcceleration = Point(0,0)):
876 '''Predicts the position of object at instant+deltaT, 876 '''Predicts the position of object at instant+deltaT,
877 at constant speed''' 877 at constant speed'''
878 return predictPositionNoLimit(nTimeSteps, self.getPositionAtInstant(instant), self.getVelocityAtInstant(instant), externalAcceleration) 878 return predictPositionNoLimit(nTimeSteps, self.getPositionAtInstant(instant), self.getVelocityAtInstant(instant), externalAcceleration)
879
880 def computeSmoothTrajectory(self, minCommonIntervalLength):
881 '''Computes the trajectory as the mean of all features
882 if a feature exists, its position is
883
884 TODO? not use the first/last 1-.. positions'''
885 from numpy import array, median
886 nFeatures = len(self.features)
887 if nFeatures == 0:
888 print('Empty object features\nCannot compute smooth trajectory')
889 else:
890 # compute the relative position vectors
891 relativePositions = {} # relativePositions[(i,j)] is the position of j relative to i
892 for i in xrange(nFeatures):
893 for j in xrange(i):
894 fi = self.features[i]
895 fj = self.features[j]
896 inter = fi.commonTimeInterval(fj)
897 if inter.length() >= minCommonIntervalLength:
898 xi = array(fi.getXCoordinates()[inter.first-fi.getFirstInstant():int(fi.length())-(fi.getLastInstant()-inter.last)])
899 yi = array(fi.getYCoordinates()[inter.first-fi.getFirstInstant():int(fi.length())-(fi.getLastInstant()-inter.last)])
900 xj = array(fj.getXCoordinates()[inter.first-fj.getFirstInstant():int(fj.length())-(fj.getLastInstant()-inter.last)])
901 yj = array(fj.getYCoordinates()[inter.first-fj.getFirstInstant():int(fj.length())-(fj.getLastInstant()-inter.last)])
902 relativePositions[(i,j)] = Point(median(xj-xi), median(yj-yi))
903 relativePositions[(j,i)] = -relativePositions[(i,j)]
879 904
880 ### 905 ###
881 # User Type Classification 906 # User Type Classification
882 ### 907 ###
883 def classifyUserTypeSpeedMotorized(self, threshold, aggregationFunc = median, ignoreNInstantsAtEnds = 0): 908 def classifyUserTypeSpeedMotorized(self, threshold, aggregationFunc = median, ignoreNInstantsAtEnds = 0):