"""Blur/sharpness scoring for best-frame selection."""

from __future__ import annotations

import cv2
import numpy as np


def sharpness_score(image: np.ndarray) -> float:
    """Variance of the Laplacian; higher = sharper."""
    if image.ndim == 3:
        image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
    return float(cv2.Laplacian(image, cv2.CV_64F).var())