Question

在尝试将档案中的图像作为枕头对象保存到列表时，我遇到了一些问题。我正在使用python和jupyter笔记本的枕头库来处理图像。最初，我想列出一个词汇表，其中的一个键是一个枕头对象，这样我就可以轻松获得自己的图像（在我看来，这可能是我错了）。我一次将存档中的图像作为文件对象打开一次，然后将其作为枕头对象打开。在此步骤中，我想保存该枕头对象，以便以后使用。所有图像都很好，如果我在将它们附加到列表时使用显示，则会显示它们。但是有一件事对我来说看起来很奇怪。如果在将图像添加到列表时不显示图像，则从该列表中获取图像时将无法进一步显示它们。我希望你能帮助我。我想问题可能出在我对文件的处理上。也许有更好的方法来满足我的需求。

import zipfile

from PIL import Image
import pytesseract
import cv2 as cv
import numpy as np

#%%
file = zipfile.ZipFile('small_img.zip', 'r')

data = []
images = []
for name in file.namelist():
    with file.open(name, 'r') as img_file:
        image = Image.open(img_file)
        data.append({'name': name, 'PilObject': image, 'text': None, 'bounding_boxes': None})
        images.append(image)
        #display(image)
        #if I leave the line above I could display my images further, fetching them from the list
        #If not, an error occurs
#%%
display(images[0])

    ---------------------------------------------------------------------------

AttributeError                            Traceback (most recent call last)

d:\pythonprojects\untitled\venv\lib\site-packages\IPython\core\formatters.py in __call__(self, obj)
    343             method = get_real_method(obj, self.print_method)
    344             if method is not None:
--> 345                 return method()
    346             return None
    347         else:

d:\pythonprojects\untitled\venv\lib\site-packages\PIL\Image.py in _repr_png_(self)
    670         """
    671         b = io.BytesIO()
--> 672         self.save(b, "PNG")
    673         return b.getvalue()
    674 

d:\pythonprojects\untitled\venv\lib\site-packages\PIL\Image.py in save(self, fp, format, **params)
   2122 
   2123         # may mutate self!
-> 2124         self._ensure_mutable()
   2125 
   2126         save_all = params.pop("save_all", False)

d:\pythonprojects\untitled\venv\lib\site-packages\PIL\Image.py in _ensure_mutable(self)
    616     def _ensure_mutable(self):
    617         if self.readonly:
--> 618             self._copy()
    619         else:
    620             self.load()

d:\pythonprojects\untitled\venv\lib\site-packages\PIL\Image.py in _copy(self)
    609 
    610     def _copy(self):
--> 611         self.load()
    612         self.im = self.im.copy()
    613         self.pyaccess = None

d:\pythonprojects\untitled\venv\lib\site-packages\PIL\ImageFile.py in load(self)
    241                         while True:
    242                             try:
--> 243                                 s = read(self.decodermaxblock)
    244                             except (IndexError, struct.error) as e:
    245                                 # truncated png/gif

d:\pythonprojects\untitled\venv\lib\site-packages\PIL\PngImagePlugin.py in load_read(self, read_bytes)
    861         self.__idat = self.__idat - read_bytes
    862 
--> 863         return self.fp.read(read_bytes)
    864 
    865     def load_end(self):

~\AppData\Local\Programs\Python\Python37\lib\zipfile.py in read(self, n)
    928         self._offset = 0
    929         while n > 0 and not self._eof:
--> 930             data = self._read1(n)
    931             if n < len(data):
    932                 self._readbuffer = data

~\AppData\Local\Programs\Python\Python37\lib\zipfile.py in _read1(self, n)
    996             data = self._decompressor.unconsumed_tail
    997             if n > len(data):
--> 998                 data += self._read2(n - len(data))
    999         else:
   1000             data = self._read2(n)

~\AppData\Local\Programs\Python\Python37\lib\zipfile.py in _read2(self, n)
   1028         n = min(n, self._compress_left)
   1029 
-> 1030         data = self._fileobj.read(n)
   1031         self._compress_left -= len(data)
   1032         if not data:

~\AppData\Local\Programs\Python\Python37\lib\zipfile.py in read(self, n)
    751                         "is an open writing handle on it. "
    752                         "Close the writing handle before trying to read.")
--> 753             self._file.seek(self._pos)
    754             data = self._file.read(n)
    755             self._pos = self._file.tell()

AttributeError: 'NoneType' object has no attribute 'seek'

<PIL.PngImagePlugin.PngImageFile image mode=RGB size=3600x6300 at 0x24E8704B1C8>

Answer 1

我很好奇，问题中的代码是否按原样工作？
因为似乎发生了各种奇怪的事情。
（由于缺少opencv软件包，我无法按原样进行测试。）

以此为基准，检查图像是否有效，
从档案中读取时。

import zipfile

from PIL import Image

archive = zipfile.ZipFile('media.zip', 'r')
fileNames = archive.namelist()
fileNames.pop(0)  # Remove directory entry (here, 'media/').

# Opening the image files, could be as simple as this:
images = [Image.open(fName) for fName in fileNames]

# Test images, by displaying them with tkinter.
import tkinter as tk
from PIL import ImageTk
tk.Tk()
# Store references, to keep PhotoImages alive (for tkinter).
tkImages = [ImageTk.PhotoImage(img) for img in images]
for img in tkImages: tk.Label(image=img).pack()
tk.mainloop()

能否更新打开图像的循环，
根据这个，看看问题是否仍然存在？

为什么在尝试显示图像（PIL对象）时出现属性错误

1 个答案: