图像无法加载为灰度(skimage)

Question

我正在尝试将图像加载为灰度,如下所示:

from skimage import data
from skimage.viewer import ImageViewer

img = data.imread('my_image.png', as_gray=True)

但是,如果我使用img.shape它检查它的形状,结果证明它是一个三维的,而不是二维的数组.我究竟做错了什么？

Answer 1

从scikit-image文档中,签名data.imread如下:

skimage.data.imread(fname, as_grey=False, plugin=None, flatten=None, **plugin_args)

您的代码无法正常运行,因为关键字参数as_grey拼写错误(您放置as_gray).

样品运行

In [4]: from skimage import data

In [5]: img_3d = data.imread('my_image.png', as_grey=False)

In [6]: img_3d.dtype
Out[6]: dtype('uint8')

In [7]: img_3d.shape
Out[7]: (256L, 640L, 3L)

In [8]: img_2d = data.imread('my_image.png', as_grey=True)

In [9]: img_2d.dtype
Out[9]: dtype('float64')

In [10]: img_2d.shape
Out[10]: (256L, 640L)