import cv2 import mediapipe as mp import math import pandas as pd from sklearn.neighbors import KNeighborsClassifier

初始化MediaPipe的人体姿势模型

mp_drawing = mp.solutions.drawing_utils mp_pose = mp.solutions.pose

打开输入视频文件

cap = cv2.VideoCapture('6.mp4')

获取输入视频的帧率和分辨率

fps = int(cap.get(cv2.CAP_PROP_FPS)) width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)) height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))

创建输出视频文件

fourcc = cv2.VideoWriter_fourcc(*'mp4v') out = cv2.VideoWriter('9_1.mp4', fourcc, fps, (width, height))

加载动作数据集

warmup_df = pd.read_csv('dataset_warm-up.csv') combat_df = pd.read_csv('dataset_SHIZHAN POSE.csv') attack_df = pd.read_csv('dataset_hit.csv') respect_df = pd.read_csv('dataset_respect.csv')

将数据集合并为一个大的数据集

data = pd.concat([warmup_df, combat_df, attack_df, respect_df], ignore_index=True)

训练KNN分类器

knn = KNeighborsClassifier(n_neighbors=3) knn.fit(data[['angle1','angle2','angle3', 'angle4','angle5' ,'angle6', 'angle7','angle8','angle9','angle10','angle11']], data['label'])

处理视频文件中的每一帧

with mp_pose.Pose(min_detection_confidence=0.5, min_tracking_confidence=0.5) as pose: while cap.isOpened(): # 读取一帧 ret, frame = cap.read() if not ret: break

    # 将帧转换为RGB格式
    image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)

    # 处理人体姿势检测
    results = pose.process(image)

    # 判断是否检测到人体
    if results.pose_landmarks:
        # 绘制人体骨架
        mp_drawing.draw_landmarks(
            frame, results.pose_landmarks, mp_pose.POSE_CONNECTIONS)

        # 获取鼻子、右肩和右手腕关键点的信息
        nose = results.pose_landmarks.landmark[mp_pose.PoseLandmark.NOSE]
        right_shoulder = results.pose_landmarks.landmark[mp_pose.PoseLandmark.RIGHT_SHOULDER]
        right_wrist = results.pose_landmarks.landmark[mp_pose.PoseLandmark.RIGHT_WRIST]

        # 获取鼻子、右肩和右手腕的角度
        angle_nwr = math.degrees(math.atan2(right_wrist.y - nose.y, right_wrist.x - nose.x) - 
                                 math.atan2(right_shoulder.y - nose.y, right_shoulder.x - nose.x))


        # 获取右肘和右手腕关键点的信息
        right_elbow = results.pose_landmarks.landmark[mp_pose.PoseLandmark.RIGHT_ELBOW]
        right_wrist = results.pose_landmarks.landmark[mp_pose.PoseLandmark.RIGHT_WRIST]

        # 计算右肘和右手之间的长度
        length = math.sqrt((right_wrist.x - right_elbow.x)**2 + (right_wrist.y - right_elbow.y)**2)

        # 计算右肘和右手延长线的终点坐标
        end_x = right_wrist.x + 2 * (right_wrist.x - right_elbow.x)
        end_y = right_wrist.y + 2 * (right_wrist.y - right_elbow.y)

        # 在输出图片上绘制绿色直线
        cv2.line(frame, (int(right_wrist.x), int(right_wrist.y)), (int(end_x), int(end_y)), (0, 255, 0), 2)



        # 将数据输入KNN分类器进行预测


        label = knn.predict([[angle, angle1, angle_dl, angle_dr, angle_tr, angle_tl,angle_lka,angle_hls,angle_rka,angle_hrs,angle_nwr]])


        # 在输出图片上显示角度值和动作类型
        cv2.putText(frame, 'Angle: {:.2f}'.format(angle), (5, 43),
                    cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255), 2)


        cv2.putText(frame, label[0], (600, 450),
                    cv2.FONT_HERSHEY_SIMPLEX, 0.5, (100, 225, 225), 2)

        cv2.putText(frame, label[0], (5, 20),
                    cv2.FONT_HERSHEY_COMPLEX_SMALL, 1.5, (225, 100, 225), 2)

    else:
        # 如果未检测到人体，则跳过本帧处理
        cv2.putText(frame, 'No body detected', (50, 50),
                    cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 0, 255), 2)

    # 将帧写入输出视频文件
    out.write(frame)

    # 显示当前帧的结果
    cv2.imshow('MediaPipe Pose Detection press q exit', frame)

    # 检测是否按下q键退出
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

释放资源

cap.release() out.release() cv2.destroyAllWindows()

在右肘和右手延长线方向绘制绿色直线，直线长度为右肘和右手之间的长度的2倍内容：要在右肘和右手延长线方向绘制绿色直线，可以按照以下步骤进行：

1. 获取右肘和右手腕关键点的信息

在代码中已经获取了鼻子、右肩和右手腕关键点的信息，可以在其基础上获取右肘和右手腕关键点的信息。

right_elbow = results.pose_landmarks.landmark[mp_pose.PoseLandmark.RIGHT_ELBOW]
right_wrist = results.pose_landmarks.landmark[mp_pose.PoseLandmark.RIGHT_WRIST]

2. 计算右肘和右手之间的长度

可以使用两点之间的距离公式计算右肘和右手之间的长度。

length = math.sqrt((right_wrist.x - right_elbow.x)**2 + (right_wrist.y - right_elbow.y)**2)

3. 计算右肘和右手延长线的终点坐标

右肘和右手延长线的终点坐标可以通过以下公式计算：

end_x = right_wrist.x + 2 * (right_wrist.x - right_elbow.x)
end_y = right_wrist.y + 2 * (right_wrist.y - right_elbow.y)

其中，2代表直线长度为右肘和右手之间的长度的2倍。

4. 在输出图片上绘制绿色直线

可以使用cv2.line()函数在输出图片上绘制绿色直线。

cv2.line(frame, (int(right_wrist.x), int(right_wrist.y)), (int(end_x), int(end_y)), (0, 255, 0), 2)

将以上代码添加到原代码中的绘制人体骨架的部分，即可在右肘和右手延长线方向绘制绿色直线。