E3

import cv2

import numpy as np

cap = cv2.VideoCapture(0)

while(1):

    # Take each frame

    _, frame = cap.read()

    # Convert BGR to HSV

hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)

    # define range of blue color in HSV

lower_blue = np.array([110,50,50])

upper_blue = np.array([130,255,255])

    # Threshold the HSV image to get only blue colors

    mask = cv2.inRange(hsv, lower_blue, upper_blue)

    # Bitwise-AND mask and original image

    res = cv2.bitwise_and(frame,frame, mask= mask)

    cv2.imshow('frame',frame)

    cv2.imshow('mask',mask)

    cv2.imshow('res',res)

    k = cv2.waitKey(5) & 0xFF

    if k == 27:

        break

cv2.destroyAllWindows()