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fps_demo.py

+# USAGE
+# python fps_demo.py
+# python fps_demo.py --display 1
+
+# import the necessary packages
+from __future__ import print_function
+from imutils.video import WebcamVideoStream
+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 = WebcamVideoStream(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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