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July 1, 2018 03:45
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| from time import time | |
| _MAX_AREA_FLUCTUATION = 0.6 #percent | |
| _STONG_FRAME_COUNT = 20 | |
| _OBJECT_TIMEOUT = 3 #seconds | |
| class TrackedObject(object): | |
| """ | |
| A class to track objects detected in a frame. The class logs frame | |
| locations an object is detected and calculates an area the object is | |
| likely to be in. | |
| >>> trackedObject = TrackedObject("Bob") | |
| >>> trackedObject.addTrackPoint(None) | |
| >>> trackedObject.addTrackPoint(None) | |
| >>> trackedObject.numTrackPoints() | |
| 2 | |
| >>> trackedObject.noMatchFound() | |
| >>> trackedObject.addTrackPoint(None) | |
| >>> trackedObject.numTrackPoints() | |
| 3 | |
| """ | |
| def __init__(self, name): | |
| self._name = name | |
| self._consecFailedMatchs = 0 | |
| self._trackPoints = [] | |
| self._lastSeen = time() | |
| self._firstSeen = None | |
| def getScanSpace(self): | |
| "return estimated area object is located" | |
| scanArea = self._trackPoints[-1].copy() | |
| scanArea *= self.timeElapsedSinceLastSeen() * 20 | |
| scanArea.center = self._trackPoints[-1].center | |
| return scanArea | |
| def numTrackPoints(self): return len(self._trackPoints) | |
| def timeElapsedSinceLastSeen(self): | |
| return time() - self._lastSeen | |
| def hasLeftFrame(self): | |
| """ | |
| >>> from time import sleep | |
| >>> trackedObject = TrackedObject("Bob") | |
| >>> trackedObject.addTrackPoint(None) | |
| >>> trackedObject.noMatchFound() | |
| >>> sleep(4) | |
| >>> trackedObject.hasLeftFrame() | |
| True | |
| """ | |
| return self._consecFailedMatchs > 0 and self.timeElapsedSinceLastSeen() > _OBJECT_TIMEOUT | |
| def strongFrameCount(self): | |
| return len(self._trackPoints) > _STONG_FRAME_COUNT | |
| def addTrackPoint(self, rect): | |
| self._lastSeen = time() | |
| if not self._firstSeen: | |
| self._firstSeen = time() | |
| self._consecFailedMatchs = 0 | |
| self._trackPoints.append(rect) | |
| def isMatchToRect(self, rect): | |
| intersectingRect = rect.intersectingRect(self.rect) | |
| if not intersectingRect: | |
| return False | |
| percentAreaChange = abs(intersectingRect.area() / float(self.rect.area())) | |
| # if the new found object covers _MAX_AREA_FLUCTUATION of the area of the last found object then we have a match | |
| return percentAreaChange > _MAX_AREA_FLUCTUATION | |
| def noMatchFound(self): | |
| self._consecFailedMatchs += 1 | |
| if __name__ == "__main__": | |
| import doctest | |
| doctest.testmod(verbose=True) |
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