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from __future__ import print_function
import cv2 as cv
import argparse
parser = argparse.ArgumentParser(description='This program shows how to use background subtraction methods provided by \
OpenCV. You can process both videos and images.')
parser.add_argument('--input', type=str, help='Path to a video or a sequence of image.', default='vtest.avi')
parser.add_argument('--algo', type=str, help='Background subtraction method (KNN, MOG2).', default='MOG2')
args = parser.parse_args()
## [create]
#create Background Subtractor objects
if args.algo == 'MOG2':
backSub = cv.createBackgroundSubtractorMOG2()
else:
backSub = cv.createBackgroundSubtractorKNN()
## [create]
## [capture]
capture = cv.VideoCapture(cv.samples.findFileOrKeep(args.input))
if not capture.isOpened():
print('Unable to open: ' + args.input)
exit(0)
## [capture]
while True:
ret, frame = capture.read()
if frame is None:
break
## [apply]
#update the background model
fgMask = backSub.apply(frame)
## [apply]
## [display_frame_number]
#get the frame number and write it on the current frame
cv.rectangle(frame, (10, 2), (100,20), (255,255,255), -1)
cv.putText(frame, str(capture.get(cv.CAP_PROP_POS_FRAMES)), (15, 15),
cv.FONT_HERSHEY_SIMPLEX, 0.5 , (0,0,0))
## [display_frame_number]
## [show]
#show the current frame and the fg masks
cv.imshow('Frame', frame)
cv.imshow('FG Mask', fgMask)
## [show]
keyboard = cv.waitKey(30)
if keyboard == 'q' or keyboard == 27:
break
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