TypeError: 图片数据不能转换为float // 导入.png图片时

Question

I saved inverted binarized images after extracting lines from tables as png (did it with opencv). Now when I try to load them with opencv or matplotlib it will show NoneType or the error in the headline. I have checked many different posts with the same error. I guess it has something to do with the image data.

import cv2
import matplotlib.pyplot as plt


imgs = cv2.imread('Users/marius/Desktop/PDF/imgvh/1.png')
cv2.imshow('Users/marius/Desktop/PDF/imgvh/1.png', imgs)

The error which occurs when using cv2:

cv2.error: OpenCV(4.2.0) /Users/travis/build/skvark/opencv-python/opencv/modules/highgui/src/window.cpp:376: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'

Using matplotlib in this way:

imgs = plt.imshow('Users/marius/Desktop/PDF/imgvh/1.png')
plt.show()

leads to the following error:

TypeError: Image data of dtype <U49 cannot be converted to float

Answer 1

The OpenCV part doesn't work because you omitted the slash at the start of the path ahead of Users/marius... . It should be:

imgs = cv2.imread('/Users/marius/Desktop/PDF/imgvh/1.png')

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The matplotlib part doesn't work because it should be:

imgs = cv2.imread('/Users/marius...')

plt.imshow(imgs)
plt.show()