import cv2
import numpy as np

def visualize_pieces(image: np.ndarray, pieces: list) -> np.ndarray:
    vis_image = image.copy()
    for piece in pieces:
        contour = piece.get('contour')  # Assume contour is stored
        if contour is not None:
            cv2.drawContours(vis_image, [contour], -1, (0, 255, 0), 2)
            cv2.putText(
                vis_image,
                f"ID: {piece['id']}",
                (int(contour[:, :, 0].min()), int(contour[:, :, 1].min()) - 10),
                cv2.FONT_HERSHEY_SIMPLEX,
                0.5,
                (0, 0, 255),
                1
            )
    return vis_image