Create landmarks.py

landmarks.py

@@ -0,0 +1,37 @@
+import numpy as np
+from numpy.linalg import norm
+
+def normalize_landmarks(landmarks):
+    """
+    Normalize the hand landmarks.
+    
+    Parameters:
+        landmarks (numpy.ndarray): Array of hand landmarks.
+
+    Returns:
+        numpy.ndarray: Normalized landmarks.
+    """
+    center = np.mean(landmarks, axis=0)
+    landmarks_centered = landmarks - center
+    std_dev = np.std(landmarks_centered, axis=0)
+    landmarks_normalized = landmarks_centered / std_dev
+    return np.nan_to_num(landmarks_normalized)
+
+def calculate_angles(landmarks):
+    """
+    Calculate angles between hand landmarks.
+    
+    Parameters:
+        landmarks (numpy.ndarray): Array of hand landmarks.
+
+    Returns:
+        list: List of calculated angles.
+    """
+    angles = []
+    for i in range(20):
+        for j in range(i + 1, 21):
+            vector = landmarks[j] - landmarks[i]
+            angle_x = np.arccos(np.clip(vector[0] / norm(vector), -1.0, 1.0))
+            angle_y = np.arccos(np.clip(vector[1] / norm(vector), -1.0, 1.0))
+            angles.extend([angle_x, angle_y])
+    return angles