OpenCV

import cv2

import numpy as np

cam = cv2.VideoCapture(0)

cv2.namedWindow("test")

img_counter = 0

while True:

    ret, frame = cam.read()

    cv2.imshow("test", frame)

    if not ret:

        break

    k = cv2.waitKey(1)

    if k%256 == 27:

        # ESC pressed

print("Escape hit, closing...")

        break

elif k%256 == 32:

        # SPACE pressed

img_name = "opencv_frame_{}.png".format(img_counter)

        cv2.imwrite(img_name, frame)

print("{} written!".format(img_name))

img_counter += 1

cam.release()

cv2.destroyAllWindows()

________________________________________________________

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()