def crop_center_point(image_array, size):
    """

    Finding point for center crop for gray scale

    image_array: numpy array of image
    size: desirable width & height as input
$
    return -> cropped the center of input image into given size
    """
    img_height, img_width = image_array.shape
    crop_height, crop_width = size
    location_crop = ((img_height - crop_height)//2, (img_width-crop_width)//2)
    return location_crop