import cv2
import numpy as np

def calculate_focus_score(frame):
    """
    Calculate focus score using Laplacian variance.
    """
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    laplacian = cv2.Laplacian(gray, cv2.CV_64F)
    score = laplacian.var()
    return score

def calculate_focus_score_sobel(frame):
    """
    Focus score using Sobel gradients.
    """
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    sobel_x = cv2.Sobel(gray, cv2.CV_64F, 1, 0, ksize=3)
    sobel_y = cv2.Sobel(gray, cv2.CV_64F, 0, 1, ksize=3)
    score = np.mean(sobel_x**2 + sobel_y**2)
    return score