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)