cv2.imread始终返回None类型-使用cv虚拟环境

Question

I am using a virtual environment, which I called cv. I am trying to read into a numpy array using opencv a .cr2 raw image.

Using:

import cv2
img = cv2.imread("raw.cr2")
print img

Returns:

None

Always.

I believe the problem is in the path of raw.cr2 , which cannot be found apparently. I have tried including the absolute path in the file I pass to imread. My file is in the home folder (~) where I run python from. I know the path is the issue because if I run sys.os.exists(path) , it always returns False .

Lastly, I also tried reading raw.cr2 using scipy.misc:

img = scipy.misc.imread(path)

Returns:

IOError: cannot identify image file 'raw.cr2'

Answer 1

Don't know if you ever solved this. I recently encountered the same problem (using ArchLinux) and found it was a permissions issue. Had to chown the images I wanted to use. Silly me.