def find_block_transform(image, resized_image, x, y, block_size, stride):
    '''Find best transformation for given rank block.

    Parameters
    ----------
    image : np.array
        Source B/W image.

    resized_image: np.array
        Resized source image.

    x, y: int, int
        Coordinates of the rank block.

    block_size: int
        Size of rank block.

    stride: int
        Vertical and horizontal stride for domain block search.

    Returns
    -------
    best_transform: BlockTransform
        Best transformation.
    '''

    # YOUR CODE HERE

    return best_transform