import cv2
import numpy as np

def preprocess_image(image):
    image = np.array(image)
    image = cv2.cvtColor(image, cv2.COLOR_RGB2GRAY)
    image = cv2.resize(image, (224, 224))
    image = image / 255.0
    image = image.reshape(1, 224, 224, 1)
    return image