This snippet is used as part of blog post related to HSV

BallDetection.py

# Initalize webcam. 0 starts built-in camera
cap = cv2.VideoCapture(0)

# Specify HSV range of Tennis Ball
ballHSVLower = np.array([25, 75, 85])
ballHSVUpper = np.array([50, 220, 255])

while True:
    # Read captured webcam frame
    _, frame = cap.read()
    
    # Convert color frame into HSV
    hsv_img = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)

    # Threshold the HSV image to get Tennis ball only
    mask = cv2.inRange(hsv_img, ballHSVLower, ballHSVUpper)

    # Find contours from HSV masked image
    _, contours, _ = cv2.findContours(mask.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)