cv2.imshow() isn't working [edge R]

[Goolge 0]

I installed devian10 on tinker-edge-r.

The following error occurred as soon as cv2.imshow() was performed with the test code.

And I try to apt-get install libgtk2.0-dev and pkg-config.
How can I resolve the error?

 

Quote

error: (-2:Unspecified error) The function is not implemented.
Rebuild the library with Windows, GTK+ 2.x or Cocoa support.
If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config,
then re-run cmake or configure script in function 'cvShowImage'

 

 

Edited August 31, 2022 by Goolge

[tooz 52]

hello @Goolge, 

what is your test code? have you done what the notice suggested?

(If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage')

[tooz 52]

just tested the cv2.imshow() function on my side and no errors shown. if the debian 10 os you're using is the official release from our website, python/ opencv pakages are built in the image; if you're using a third party debian 10 os, maybe follow this tutorial to get all the necessary libs/ pkgs installed: https://linuxize.com/post/how-to-install-opencv-on-debian-10/

[Goolge 0]

On 9/2/2022 at 5:07 PM, tooz said:

just tested the cv2.imshow() function on my side and no errors shown. if the debian 10 os you're using is the official release from our website, python/ opencv pakages are built in the image; if you're using a third party debian 10 os, maybe follow this tutorial to get all the necessary libs/ pkgs installed: https://linuxize.com/post/how-to-install-opencv-on-debian-10/

Thank you very much.
I almost gave up.
I'll give it a try.

I have one more question.
Two webcams were connected in the tinker edge. 'cv2.open' works well for two webcams, but only one webcam can be read. How do I 'cv2.read' two webcams at the same time?

[Tinker Board 2]

Hi,

Usually, before you use `cv2.open`, should have a define codes to let cv2 know use which camera.

so should such as:

import cv2
cam0 = cv2.VideoCapture(0)
cam1 = cv2.VideoCapture(1)
ret0, frame0 = cam0.read()

and node ID is based on your camera node in system.

[marco@bigsis.tech 0]

On 9/2/2022 at 9:07 AM, tooz said:

just tested the cv2.imshow() function on my side and no errors shown. if the debian 10 os you're using is the official release from our website, python/ opencv pakages are built in the image; if you're using a third party debian 10 os, maybe follow this tutorial to get all the necessary libs/ pkgs installed: https://linuxize.com/post/how-to-install-opencv-on-debian-10/

i have downloaded the debian 10 official realease from tinker board asus website and then followed your suggested tutorial to install opencv but i am still getting the error:

error: (-2:Unspecified error) The function is not implemented.
Rebuild the library with Windows, GTK+ 2.x or Cocoa support.
If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config,
then re-run cmake or configure script in function 'cvShowImage'

 

Edited November 23, 2022 by marco@bigsis.tech

[tooz 52]

hello @marco@bigsis.tech

which version of opencv were you building? were you building it on tinker board 2s?

[marco@bigsis.tech 0]

Hi,

thank you for your reply. No, I am building it on the Tinker Edge R, and the downloaded version of opencv after following that  tutorial is 4.6.0.

I also tried to execute the RKNN toolkit which gives opencv 4.4.0 and still got that error message.

Edited November 23, 2022 by marco@bigsis.tech

[marco@bigsis.tech 0]

19 minutes ago, tooz said:

hello @marco@bigsis.tech

which version of opencv were you building? were you building it on tinker board 2s?

Hi,

thank you for your reply. No, I am building it on the Tinker Edge R, and the downloaded version of opencv after following that  tutorial is 4.6.0.

I also tried to execute the RKNN toolkit which gives opencv 4.4.0 and still got that error me

Edited November 23, 2022 by marco@bigsis.tech

[tooz 52]

hello @marco@bigsis.tech, 

i was testing tinker board 2s and did manage to compile opencv:

sudo apt-get update
sudo apt install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev

git clone https://github.com/opencv/opencv.git
cd opencv/
git checkout 4.1
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D INSTALL_C_EXAMPLES=OFF \
-D PYTHON_EXECUTABLE=$(which python3) \
-D BUILD_opencv_python2=OFF \
-D PYTHON3_EXECUTABLE=$(which python3) \
-D WITH_GSTREAMER=ON ..
make && sudo make install

 

will check on tinker edge r and let you know 

[marco@bigsis.tech 0]

2 minutes ago, tooz said:

hello @marco@bigsis.tech, 

i was testing tinker board 2s and did manage to compile opencv:

sudo apt-get update
sudo apt install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev

git clone https://github.com/opencv/opencv.git
cd opencv/
git checkout 4.1
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D INSTALL_C_EXAMPLES=OFF \
-D PYTHON_EXECUTABLE=$(which python3) \
-D BUILD_opencv_python2=OFF \
-D PYTHON3_EXECUTABLE=$(which python3) \
-D WITH_GSTREAMER=ON ..
make && sudo make install

 

will check on tinker edge r and let you know 

thank you for your response, I will try uninstall opencv and recompile it with your modification and let you know as well

[tooz 52]

hello @marco@bigsis.tech, 

forgot to mention that if you're using the releases from us: https://tinker-board.asus.com/download-list.html?product=tinker-edge-r

the script file of rknn toolkit installation is included (you can find it on desktop) 

no need to install opencv as it's included in the toolkit installation

[tooz 52]

16 hours ago, marco@bigsis.tech said:

Hi,

thank you for your reply. No, I am building it on the Tinker Edge R, and the downloaded version of opencv after following that  tutorial is 4.6.0.

I also tried to execute the RKNN toolkit which gives opencv 4.4.0 and still got that error message.

hello @marco@bigsis.tech, 

so the version of opencv-python was upgraded, if you've encountered import cv2.imshow() error, please remove the build-in opencv-python:

python3 -m pip uninstall opencv-python

then re-install:

python3 -m pip install opencv-python --user 

 

[marco@bigsis.tech 0]

1 hour ago, tooz said:

hello @marco@bigsis.tech, 

so the version of opencv-python was upgraded, if you've encountered import cv2.imshow() error, please remove the build-in opencv-python:

python3 -m pip uninstall opencv-python

then re-install:

python3 -m pip install opencv-python --user 

 

Hi,

thank you again for your quick response.

at the end I was able to solve the error by re-compiling opencv  following the same tutorial  BUT  installing  libgtk2.0-dev  instead of libgtk-3-dev.

I will try your suggestion as well.

However I am currently facing another problem..

I am trying to capture videos from 4 usb cameras.  I am able to preview only 3 cameras together, but if I try with 4 I gets the following error:

(-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow

Any suggestion please?

 

 

[tooz 52]

hello @marco@bigsis.tech, 

this is the imshow function error, perhaps you want to check and adjust the import frame

[marco@bigsis.tech 0]

6 hours ago, tooz said:

hello @marco@bigsis.tech, 

this is the imshow function error, perhaps you want to check and adjust the import frame

Hello,

Do you mean the frame size?