python如何实时识别摄像头中手势？

以下是使用Python、OpenCV和MediaPipe实现实时手势识别的完整代码。这个示例可以识别"OK"、"剪刀"、"握拳"、"一"、"二"、"三"等手势：

import cv2
import mediapipe as mp
import math

# 初始化MediaPipe
mp_hands = mp.solutions.hands
hands = mp_hands.Hands(
    static_image_mode=False,
    max_num_hands=2,
    min_detection_confidence=0.5,
    min_tracking_confidence=0.5
)
mp_draw = mp.solutions.drawing_utils

# 打开摄像头
cap = cv2.VideoCapture(0)

def calculate_distance(p1, p2):
    """计算两点之间的距离"""
    return math.sqrt((p1.x - p2.x)**2 + (p1.y - p2.y)**2)

def recognize_gesture(hand_landmarks):
    """识别手势"""
    # 获取所有手指的关键点
    thumb_tip = hand_landmarks.landmark[4]
    index_tip = hand_landmarks.landmark[8]
    middle_tip = hand_landmarks.landmark[12]
    ring_tip = hand_landmarks.landmark[16]
    pinky_tip = hand_landmarks.landmark[20]

    # 获取手掌基准点
    wrist = hand_landmarks.landmark[0]
    thumb_base = hand_landmarks.landmark[2]
    index_base = hand_landmarks.landmark[5]
    middle_base = hand_landmarks.landmark[9]
    ring_base = hand_landmarks.landmark[13]
    pinky_base = hand_landmarks.landmark[17]

    # 计算每个手指尖到手掌的距离
    thumb_dist = calculate_distance(thumb_tip, wrist)
    index_dist = calculate_distance(i...

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