使用SciKit图像中的匹配模板检查模板是否存在

match_template 方法从SciKit图像库中检查模板是否存在于图像中并获取其X和Y位置。我用的是 scikit-image template matching example

我的代码如下:

#!/usr/bin/env python
# -*- encoding: utf-8 -*-

import numpy as np
from skimage import io
from skimage.color import rgb2gray
from skimage.feature import match_template


def exists(image, template):
    """Perform a template match and returns the X and Y positions.

    Args:
        image (str): path to the full image.
        template (str): path to the template image.

    Returns:
        If there is a match, return the X and Y positions.
        If there is not match, return None.
    """

    image = io.imread(image, as_gray=True)
    template = io.imread(template, as_gray=True)

    result = match_template(image, template, pad_input=True)

    return np.unravel_index(np.argmax(result), result.shape)[::-1]

    # unreachable
    return None

如何检查模板是否不存在并返回 None