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python - raise ValueError( --> 182 "在 %s 模式下找不到读取指定文件的格式" % modename

问题描述

这两个代码都会引发错误。我不确定确切的原因是什么？我正在使用 Jupyter 笔记本运行。

from __future__ import print_function, division
import os
import torch
import torch.nn as nn
import torchvision
from torch.autograd import Variable
import pandas as pd
from skimage import io, transform
import numpy as np
import matplotlib.pyplot as plt
from torch.utils.data import Dataset, DataLoader
from torchvision import transforms, utils

def show_landmarks(image, landmarks):
    """Show image with landmarks"""
    plt.imshow(image)
    plt.scatter(landmarks[:, 0], landmarks[:, 1], s=80, marker='.', c='b')
    plt.pause(0.001)  # pause a bit so that plots are updated

plt.figure()
img_name = "faces/person-7.jpg"
print(img_name)

img = io.imread(img_name)
print('here')
show_landmarks(img, landmarks)
plt.show()

###def show_landmarks(image, landmarks):
###    """Show image with landmarks"""
###    plt.imshow(image)
###    plt.scatter(landmarks[:, 0], landmarks[:, 1], s=10, marker='.', c='r')
###    plt.pause(0.001)  # pause a bit so that plots are updated

###plt.figure()
###show_landmarks(io.imread(os.path.join('data/faces/', img_name)),
###               landmarks)
###plt.show()

错误是：

faces/person-7.jpg

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-14-972bef8edc6f> in <module>
      9 print(img_name)
     10 
---> 11 img = io.imread(img_name)
     12 print('here')
     13 show_landmarks(img, landmarks)

~/anaconda3/lib/python3.7/site-packages/skimage/io/_io.py in imread(fname, as_gray, plugin, **plugin_args)
     46 
     47     with file_or_url_context(fname) as fname:
---> 48         img = call_plugin('imread', fname, plugin=plugin, **plugin_args)
     49 
     50     if not hasattr(img, 'ndim'):

~/anaconda3/lib/python3.7/site-packages/skimage/io/manage_plugins.py in call_plugin(kind, *args, **kwargs)
    207                                (plugin, kind))
    208 
--> 209     return func(*args, **kwargs)
    210 
    211 

~/anaconda3/lib/python3.7/site-packages/skimage/io/_plugins/imageio_plugin.py in imread(*args, **kwargs)
      8 @wraps(imageio_imread)
      9 def imread(*args, **kwargs):
---> 10     return np.asarray(imageio_imread(*args, **kwargs))

~/anaconda3/lib/python3.7/site-packages/imageio/core/functions.py in imread(uri, format, **kwargs)
    263 
    264     # Get reader and read first
--> 265     reader = read(uri, format, "i", **kwargs)
    266     with reader:
    267         return reader.get_data(0)

~/anaconda3/lib/python3.7/site-packages/imageio/core/functions.py in get_reader(uri, format, mode, **kwargs)
    180         modename = MODENAMES.get(mode, mode)
    181         raise ValueError(
--> 182             "Could not find a format to read the specified file in %s mode" % modename
    183         )
    184 

ValueError: Could not find a format to read the specified file in single-image mode

<Figure size 432x288 with 0 Axes>

标签： pythonimagepython-imaging-library

解决方案

该错误似乎与第 11 行有关 - img = io.imread(img_name)。可能会引发此错误，因为您没有将可选的pluginstr与imread一起使用，或者因为imread找不到合适的插件来读取图像文件。

skimage.io.imread 带参数：

skimage.io.imread(fname, as_gray=False, plugin=None, **plugin_args)

pluginstr, optional
Name of plugin to use. By default, the different plugins are tried (starting with imageio) until a suitable candidate is found. If not given and fname is a tiff file, the tifffile plugin will be used.

您可以通过尝试各种插件来解决错误，如下例所示：

io.imread(f.name, plugin="tifffile")

这是可用插件的列表

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