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Error running example app on ncappzoo

Hi Everyone,
I recently bought a nc stick and I am running into an error while trying to run the example apps. Specifically, the gender_age_lbp.

I am receiving the following error:

cp gendernet.graph gender_graph/graph;
cp agenet.graph age_graph/graph;
no videoio library
Created cpp/gender_age_lbp executable

making run age
cd cpp; ./gender_age_lbp age; cd ..;
MVNC device 0 name: 2
Successfully opened MVNC device2
Num of NCS connected: 1
Successfully Allocated Age graph for MVNC device
OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file /build/opencv-SviWsf/opencv-, line 269
terminate called after throwing an instance of 'cv::Exception'
what(): /build/opencv-SviWsf/opencv- error: (-215) size.width>0 && size.height>0 in function imshow

Aborted (core dumped)

Running Ubuntu 16.04 on virtual box.

Any help appreciated.



  • 8 Comments sorted by Votes Date Added
  • @leeroy It seems that maybe you do not have a USB/web camera connected. This example uses a webcam for live inference so please make sure you have a web camera or usb camera connected and try again. By default, the camera source is set to device 0, you can try adjusting this value to 1 if 0 does not work for you.

  • @Tome_at_Intel Hi, I encounter the same issue even after running it by replacing define CAM_SOURCE by a 1 instead of 0. trying to find out if it is not coming from the cpp videocapture function but I'm not a cpp user. Any idea?
    By the way the prototype is running very well on a computer, this issue is really raspberry pi related.

  • @leeroy Hi, don't know if you figured out how to handle this but in case here is what I've found.
    It looks like the error comes from opencv installation. I managed to get rid of it by reinstalling opencv following this tutorial.

    @Tome_at_Intel On an other hand, I managed to run the entire make all and make run for the gender_ager example on the raspberry pi but I have the following issue:
    After Successfully Allocated both Gender and Age grahs, I have a quick display of the camera and then the script stopped saying : "Segmentation fault".

    Maybe you have an idea of where it comes from ?


  • @malonzo Can you try recloning the ncappzoo from the githuub repo and try again? There was an issue with the gender_age_lbp app, but a fix was added. I can confirm that it works on my Pi.

  • @Tome_at_Intel Indeed, recloning the ncappzoo fixes the issue, thank you.

  • Hi guys,
    Great timing on my part as i've just got the spare time to return to this problem. That seems a very complex way to install openCV. Although the openCV version i previously installed was an older version as instructed by pyimagesearch. I will try a fresh install on my pi today and see how things go.
    Thanks for the help guys,

  • Hi,
    I've the same issue with the last version of the appzoo (ncsdk2 branch). Actually Opencv is waiting for a camera plugged in an usb port and so don't consider the piCamera. You can easily simulate an usb camera with the piCamera by running

    sudo modprobe bcm2835_v4l2

    before launching gender_age_lbp

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