part1-2_extract-hand.py

import cv2
import numpy as np
import mediapipe as mp

image = cv2.imread("thumbup.jpeg")


mp_hands = mp.solutions.hands
mp_drawing = mp.solutions.drawing_utils
mp_drawing_styles = mp.solutions.drawing_styles

# Run MediaPipe Hands.
with mp_hands.Hands(
    static_image_mode=True,
    max_num_hands=2,
    min_detection_confidence=0.7) as hands:
  
    # Convert the BGR image to RGB, flip the image around y-axis for correct 
    # handedness output and process it with MediaPipe Hands.
    results = hands.process(cv2.flip(cv2.cvtColor(image, cv2.COLOR_BGR2RGB), 1))

    # Print handedness (left v.s. right hand).
    print(results.multi_handedness)

  
    # Draw hand landmarks of each hand.
    image_hight, image_width, _ = image.shape
    annotated_image = cv2.flip(image.copy(), 1)
    for hand_landmarks in results.multi_hand_landmarks:
      # Print index finger tip coordinates.
      print(
          f'Index finger tip coordinate: (',
          f'{hand_landmarks.landmark[mp_hands.HandLandmark.INDEX_FINGER_TIP].x * image_width}, '
          f'{hand_landmarks.landmark[mp_hands.HandLandmark.INDEX_FINGER_TIP].y * image_hight})'
      )
      mp_drawing.draw_landmarks(
          annotated_image,
          hand_landmarks,
          mp_hands.HAND_CONNECTIONS,
          mp_drawing_styles.get_default_hand_landmarks_style(),
          mp_drawing_styles.get_default_hand_connections_style())



cv2.imshow("Image", annotated_image)
cv2.waitKey(0)
cv2.destroyAllWindows()
cv2.waitKey(1)  # normally unnecessary, but it fixes a bug on 
                    # MacOS where the window doesn't close view raw