import cv2


def sharpen_image(img):
    # No sharpening required.
    # Return image exactly as generated.
    return img


def upscale_image(img, scale=2):
    height = int(img.shape[0] * scale)
    width = int(img.shape[1] * scale)

    upscaled = cv2.resize(
        img,
        (width, height),
        interpolation=cv2.INTER_NEAREST
    )

    return upscaled