feat: blur detection via Laplacian variance

analyzer.py

@@ -0,0 +1,11 @@
+import cv2
+import numpy as np
+
+
+def is_blurry(path: str, threshold: float = 100.0) -> bool:
+    """Gibt True zurueck, wenn das Bild unscharf ist (Laplacian Variance < threshold)."""
+    img = cv2.imread(path, cv2.IMREAD_GRAYSCALE)
+    if img is None:
+        return False
+    variance = cv2.Laplacian(img, cv2.CV_64F).var()
+    return bool(variance < threshold)