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# author: Adrian Rosebrock
# website: http://www.pyimagesearch.com
# USAGE
# BE SURE TO INSTALL 'imutils' PRIOR TO EXECUTING THIS COMMAND
# python fps_demo.py
# python fps_demo.py --display 1
# import the necessary packages
from __future__ import print_function
from imutils.video import VideoStream
from imutils.video import FPS
import argparse
import imutils
import cv2
# construct the argument parse and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-n", "--num-frames", type=int, default=100,
help="# of frames to loop over for FPS test")
ap.add_argument("-d", "--display", type=int, default=-1,
help="Whether or not frames should be displayed")
args = vars(ap.parse_args())
# grab a pointer to the video stream and initialize the FPS counter
print("[INFO] sampling frames from webcam...")
stream = cv2.VideoCapture(0)
fps = FPS().start()
# loop over some frames
while fps._numFrames < args["num_frames"]:
# grab the frame from the stream and resize it to have a maximum
# width of 400 pixels
(grabbed, frame) = stream.read()
frame = imutils.resize(frame, width=400)
# check to see if the frame should be displayed to our screen
if args["display"] > 0:
cv2.imshow("Frame", frame)
key = cv2.waitKey(1) & 0xFF
# update the FPS counter
fps.update()
# stop the timer and display FPS information
fps.stop()
print("[INFO] elasped time: {:.2f}".format(fps.elapsed()))
print("[INFO] approx. FPS: {:.2f}".format(fps.fps()))
# do a bit of cleanup
stream.release()
cv2.destroyAllWindows()
# created a *threaded *video stream, allow the camera senor to warmup,
# and start the FPS counter
print("[INFO] sampling THREADED frames from webcam...")
vs = VideoStream(src=0).start()
fps = FPS().start()
# loop over some frames...this time using the threaded stream
while fps._numFrames < args["num_frames"]:
# grab the frame from the threaded video stream and resize it
# to have a maximum width of 400 pixels
frame = vs.read()
frame = imutils.resize(frame, width=400)
# check to see if the frame should be displayed to our screen
if args["display"] > 0:
cv2.imshow("Frame", frame)
key = cv2.waitKey(1) & 0xFF
# update the FPS counter
fps.update()
# stop the timer and display FPS information
fps.stop()
print("[INFO] elasped time: {:.2f}".format(fps.elapsed()))
print("[INFO] approx. FPS: {:.2f}".format(fps.fps()))
# do a bit of cleanup
cv2.destroyAllWindows()
vs.stop()
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