utils.py

''' Class for using separate thread for video streaming through web camera'''
import cv2
from threading import Thread
class WebcamVideoStream:
    	
		def __init__(self, src=0):
			self.stream = cv2.VideoCapture(src,cv2.CAP_DSHOW)
			(self.grabbed, self.frame) = self.stream.read()
			self.stopped = False

		def start(self):
				# start the thread to read frames from the video stream
			Thread(target=self.update, args=()).start()
			return self
			
		def update(self):
			# keep looping infinitely until the thread is stopped
			while True:
				# if the thread indicator variable is set, stop the thread
				if self.stopped:
					return
				# otherwise, read the next frame from the stream
				(self.grabbed, self.frame) = self.stream.read()

		def read(self):
			# return the frame most recently read
			return self.frame
		def stop(self):
			# indicate that the thread should be stopped
			self.stopped = True