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object-tracking.py
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object-tracking.py
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#!/usr/bin/env python
"""object-tracking.py: Object detection using openCV."""
__author__ = "Aldo Vargas"
__copyright__ = "Copyright 2015 Altax.net"
__license__ = "GPL"
__version__ = "1"
__maintainer__ = "Aldo Vargas"
__email__ = "alduxvm@gmail.com"
__status__ = "Development"
import numpy as np
import cv2
def run_main():
cap = cv2.VideoCapture('crash-480.mp4')
#cap.set(3,320)
#cap.set(4,240)
# Read the first frame of the video
ret, frame = cap.read()
# Set the ROI (Region of Interest). Actually, this is a
# rectangle of the building that we're tracking
c,r,w,h = 427,240,50,50
track_window = (c,r,w,h)
# Create mask and normalized histogram
roi = frame[r:r+h, c:c+w]
hsv_roi = cv2.cvtColor(roi, cv2.COLOR_BGR2HSV)
mask = cv2.inRange(hsv_roi, np.array((0., 30.,32.)), np.array((180.,255.,255.)))
roi_hist = cv2.calcHist([hsv_roi], [0], mask, [180], [0, 180])
cv2.normalize(roi_hist, roi_hist, 0, 255, cv2.NORM_MINMAX)
term_crit = (cv2.TERM_CRITERIA_EPS | cv2.TERM_CRITERIA_COUNT, 80, 1)
while True:
t = cv2.getTickCount()
ret, frame = cap.read()
hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)
dst = cv2.calcBackProject([hsv], [0], roi_hist, [0,180], 1)
ret, track_window = cv2.meanShift(dst, track_window, term_crit)
x,y,w,h = track_window
cv2.rectangle(frame, (x,y), (x+w,y+h), 255, 2)
cv2.putText(frame, 'Tracked', (x-25,y-10), cv2.FONT_HERSHEY_SIMPLEX,
.5, (255,255,255), 1, cv2.CV_AA)
t = cv2.getTickCount() - t
print "detection time = %gms" % (t/(cv2.getTickFrequency()*1000.))
cv2.imshow('Tracking', frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
if __name__ == "__main__":
run_main()