Error setting DNN_BACKEND_INFERENCE_ENGINE with Opencv and Pyqt5

[Madureira__Anderson_]

Hello everbody

i have an app where I use Pyqt5 GUI and run:

self.net = cv2.dnn.readNetFromCaffe("no_bn.prototxt", "no_bn.caffemodel")

If I set self.net.setPreferableBackend(cv2.dnn.DNN_BACKEND_OPENCV), my GUI works perfect

If I set self.net.setPreferableBackend(cv2.dnn.DNN_BACKEND_INFERENCE_ENGINE), this following error appear:

File "/home/piscicultura/Documentos/contadorr/defDetect.py", line 25, in detect
    detections = net.forward()    
cv2.error: OpenCV(4.1.0-openvino) /home/jenkins/workspace/OpenCV/OpenVINO/build/opencv/modules/dnn/src/op_inf_engine.cpp:747: error: (-215:Assertion failed) Failed to initialize Inference Engine backend: aspect_ratio param can't be equal to zero in function 'initPlugin'

But when I run everthing out of the GUI, in pure Python opencv, BACKEND_INFERENCE_ENGINE works perfect too.

I am using l_openvino_toolkit_p_2019.1.133 and OpenCV(4.1.0-openvino)

Thanks if someone could help me.

[Shubha_R_Intel]

Dear Madureira, Anderson Luiz, This forum is for OpenVino topics such as those related to Model Optimizer or Inference Engine. For OpenCV related questions, please post your question to here:

https://answers.opencv.org/questions/

Thanks,

Shubha

[Scott_W_Intel]

This could be related to your locale, specifically your default distro "LC_NUMERIC" setting. This can cause a conflict with certain POSIX functions which can mess with data type conversion and math functions. Try adding the following to your application:

import locale

locale.setlocale(locale.LC_NUMERIC, 'C')

More info: https://doc.qt.io/qt-5/qcoreapplication.html#locale-settings