Pi TFT and OenCV : cannot open display

[snoygues]

I try to use OpenCV lib (for Python) in order to display an image on Pi TFT screen.
here is my code :

import os
import cv2

#Load image
img = cv2.imread("/home/pi/image.jpg")

#Show Images
cv2.imshow("img",img)
cv2.waitKey(0)

If I run it from SSH, if open a new window and display my image inside it.
But if I run my script from Pi TFT shell : pi@raspberrypi ~ $ python toto.py
I get following error message : (im:2433): Gtk-WARNING **: cannot open display

Notes :
* it's not a problem of image loading
* actually, it works if I execute the script after loading "startx" and use "LxTerminal", but I would like use my soft directly from shell cmd.

somebody can help me ?

[adafruit_support_mike]

A shell command isn't associated with any output terminal, so the OS doesn't know where to send the image.

Try running the following script from either context to see how the environments are different:

Code: Select all

#!/usr/bin/python

import os
os.system("set > ~/env-log")