Intel Edison error :- Gtk-WARNING **: cannot open display:

[idata]

Hi,

I installed opencv for Intel edison from http://repo.opkg.net/edison/repo/core2-32/ Alext"s repository.

Now I'm trying to capture image from webcam using opencv but it gives the following error:-

Error:-

(frame:2379): Gtk-WARNING **: cannot open display:

My code:-

import numpy as np

import cv2

cap = cv2.VideoCapture(0)

while(True):

# Capture frame-by-frame

ret, frame = cap.read()

# Display the resulting frame

cv2.imshow('frame',frame)

if cv2.waitKey(1) & 0xFF == ord('q'):

break

# When everything done, release the capture

cap.release()

cv2.destroyAllWindows()

how to solve this ?

[Carlos_M_Intel · Accepted solution]

Hi Falak,

The error you are getting could be related with the function of the code you are using. The code seems to capture video and then shows it in a window, you can't do this because there is no video on the Edison. I suggest you to try with this code:

import cv2.cv as cv

capture = cv.CaptureFromCAM(0)

img = cv.QueryFrame(capture)

cv.SaveImage("camera.jpg", img)

Regards,

Charlie

[idata]

Hi CMata_Intel,

the solution is correct. But what if i want to stream video using OpenCV with Python/C++ on my Intel Edison ?

[Carlos_M_Intel]

Hi Falak,

I found this code: https://gist.github.com/n3wtron/4624820 Simple Python Motion Jpeg (mjpeg server) from webcam. Using: OpenCV,BaseHTTPServer · GitHub and it worked for me.

1. You need to know which is the IP address of your board, you can check this with configure_edison –showWiFiIP, you should get something like 192.168.10.XX.

[Let's say that your IP address is 192.168.10.10]

2. Then run the code with python

3. Finally go to your web browser and access to 192.168.10.10:8080/cam.mjpg

Regards,

Charlie

[idata]

hi CMata_Intel,

the command you provided also worked for me. It looks like the program works properly.

but it doesn't start my camera. so I can see only "server started" message in terminal.

i cannot see video on the 192.168.1.10:8080/cam.mjpg (192.168.1.10 is my edison ip)

[Carlos_M_Intel]

Hi Falak,

Is the PC and Board on the same network?

Are you running something else in your board that may be blocking the functionality of the python code?

Regards,

Charlie

[idata]

Hi CMata_Intel,

yes the pc and edison board both are on the same network.

and I'm not running any other program. I'm just running this single script containing this python code.

[Carlos_M_Intel]

Hi Falak,

Which image version do you have currently? I suggest you to use the 159 version.

Have you changed something in the code?

Are you behind a proxy?

When you type 192.168.1.10:8080/cam.mjpg on your web browser, what are you getting as result?

I know you have installed FFMPEG I your board, what other packages have you installed? I also suggest you to try with a clean image so if you can flash the board and try again with the example let me know.

Regards,

Charlie

[YYeon1]

Hi CMata_Intel,

I'm facing the same problem. Both PC and board are on same network.

[tcp @ 0x1ca0700] Connection to tcp://192.168.8.101:8080?timeout=0 failed: Connection refused

I am using 120 version. edison-image-ww05-15.

May I know how to check the port number? Is it the same (port 8080) for everyone?

Btw, how to solve the proxy issue?

Thanks

Regards,

Yeong