将cv2.resize源码写出来

cv2.resize的源码如下：

def resize(src, dsize, fx=None, fy=None, interpolation=None):
    """
    Resizes an image.

    :param src: input image
    :param dsize: output image size; if both fx and fy are set to None, it is interpreted as the output image
        size and the aspect ratio is preserved.
    :param fx: scale factor along the horizontal axis; if set to None, it is computed as (dsize[0] / src.shape[1])
    :param fy: scale factor along the vertical axis; if set to None, it is computed as (dsize[1] / src.shape[0])
    :param interpolation: interpolation method to use; defaults to INTER_LINEAR
    :return: resized image
    """
    if fx is None and fy is None:
        fx = dsize[0] / src.shape[1]
        fy = dsize[1] / src.shape[0]
    elif fx is None:
        fx = fy
    elif fy is None:
        fy = fx

    if interpolation is None:
        interpolation = cv2.INTER_LINEAR

    return cv2.resize(src, dsize, fx=fx, fy=fy, interpolation=interpolation)

其中，cv2.resize是调用opencv库中的函数实现的，具体实现可以参考opencv官方文档。