Icevision: opencv unable to load images with special characters in the filename

[attibalazs]

🐛 Bug

Describe the bug

Opencv is not able to load images with special characters in the filename.

To Reproduce

1) Take any image file rename the filename add a special character.
In my case it was the micron symbol "10µm"

2) load the image with the open_img function

fn = Path(r'c:\data\test image (6-9µm).jpg')
data = open_img(fn)

3) see error

C:\Anaconda\envs\ice\lib\site-packages\icevision\core\record_mixins.py in _load(self)
     79 
     80     def _load(self):
---> 81         self.img = open_img(self.filepath)
     82         # TODO, HACK: is it correct to overwrite height and width here?
     83         self.height, self.width, _ = self.img.shape

C:\Anaconda\envs\ice\lib\site-packages\icevision\utils\imageio.py in open_img(fn, gray)
      8         raise ValueError(f"File {fn} does not exists")
      9     color = cv2.COLOR_BGR2GRAY if gray else cv2.COLOR_BGR2RGB
---> 10     return cv2.cvtColor(cv2.imread(str(fn), cv2.IMREAD_UNCHANGED), color)
     11 
     12 

error: OpenCV(4.5.1) C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-vjyn6ztg\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

Desktop (please complete the following information):

• OS: [windows 10]

Additional context

I know this is not an icevision issue strictly speaking, but it might be worth considering a different library for loading the image, and not using opencv.

[lgvaz]

We are currently transition to PIL for loading images. Can you check if PIL handles this correctly?

[attibalazs]

yes it works with PIL

from PIL import Image

im = Image.open(r"image 9µm.jpg")