how to deploy openvino-opencv in Qt - qt

Question

I want to use openvino-opencv for my Qt (Qt5.7.1) based project. I have downloaded and installed openvino411 (corresponding to opencv411) following the instructions here in windows10 https://docs.openvinotoolkit.org/latest/_docs_install_guides_installing_openvino_windows.html#Configure_MO. I write a .pri file to demploy the opencv in Qt:
INCLUDEPATH += C:/openvino-411/openvino_2019.2.275/opencv/include
CONFIG(release, debug|release):{
LIBS += -LC:/openvino-411/openvino_2019.2.275/opencv/lib \
-lopencv_core411 -lopencv_highgui411 -lopencv_imgproc411 -lopencv_imgcodecs411 -lopencv_features2d411 -lopencv_ml411 -lopencv_objdetect411 -lopencv_dnn411
}
CONFIG(debug, debug|release):{
LIBS += -LC:/openvino-411/openvino_2019.2.275/opencv/lib \
-lopencv_core411d -lopencv_highgui411d -lopencv_imgproc411d -lopencv_imgcodecs411d -lopencv_features2d411d -lopencv_ml411d -lopencv_objdetect411d -lopencv_dnn411d
}
But it seeems opencv canot be run in Qt, since I tried running the qt program. The popping up cmd window goes directly to "Press <RETURN> to close this window..." without doing any actually.

Answer 1

First of all, keep in mind that OpenVINO for windows is compiled against MSBUILD instead of MinGW, so if your Qt project is compiled using MinGW, OpenVINO pre-built libraries will likely fail during linking
That said, I managed to integrate OpenVINO Inference Engine with OpenCV succesfully in a big and already existent Qt based project (QT 5.13.1), under LINUX (Ubuntu 16.04), it apperas that under Windows the dependencies fragmentation makes it harder
This configuration is quite tricky and also is a work in progress (to me), I am trying to completely isolate OpenVINO dependencies aiming to deploy them completely embedded in our app, anyway like this it works:
First I installed OpenVINO (https://docs.openvinotoolkit.org/latest/_docs_install_guides_installing_openvino_linux.html) paying particular attention in following each step precisely as it is described,
also DON'T MISS TO RUN the two examples demo_security_barrier_camera and demo_squeezenet_download_convert_run, they will produce two libraries libcpu_extension.so and libgflags_nothreads.a WITHOUT WHICH OpenVINO WILL NOT WORK UNDER YOUR PROJECT, the reason why it was made this way is unknown to me
I copied the following libraries under a subfolder of my project (ThirdPartyLibraries/OpenVINOInferenceEngine):
libinference_engine.so (found in OpenVINO installation folder: /opt/intel/openvino/inference_engine/lib/intel64/libinference_engine.so)
libtbb.so (found in OpenVINO installation folder: /opt/intel/openvino/inference_engine/external/tbb/lib/intel64/libtbb.so)
for the two "cpu extension" libraries, I created a subfolder named "extension", so:
extension/libgflags_nothreads.a (found in OpenVINO Inference Engine Demo BUILD FOLDER, for me it is /home/myuser/inference_engine_demos_build/Release/lib/libgflags_nothreads.a)
extension/libcpu_extensio.so (found in OpenVINO Inference Engine Demo BUILD FOLDER, for me it is /home/myuser/inference_engine_demos_build/Release/lib/libcpu_extensio.so)
Then I also copied the includes of Inference Engine and Lib Cpu Extension from their respective installation folders to my ThirdPartyLibraries:
All the content found under /opt/intel/openvino/inference_engine/include/ goes under /ThirdPartyLibraries/OpenVINOInferenceEngine/include
All the content found under /opt/intel/openvino/deployment_toos/inference_engine/src/extension/ goes under /ThirdPartyLibraries/OpenVINOInferenceEngine/extension/include
Finally here's my .pri file for Qt:
OPENVINODIR = /home/myuser/code_qt5_HG/Libraries/ThirdPartyLibraries/OpenVINOInferenceEngine
LIBS_OPENVINO += -L$$OPENVINODIR \
-linference_engine \
-ltbb \
-L$$OPENVINODIR/extension \
-lcpu_extension
INCLUDES_OPENVINO += $$OPENVINODIR/include \
+= $$OPENVINODIR/extension/include
LIBS += $$LIBS_OPENVINO
INCLUDEEPATH += $$INCLUDES_OPENVINO
That's it, doing so allows me to reference and use Inference Engine in my project like this:
#include <ie_core.hpp>
#include <ie_plugin_config.hpp>
#include <cpp/ie_cnn_net_reader.h>
#include <ext_list.hpp>
.....
InferenceEngine::Core ie;
ie.AddExtension(std::make_shared<InferenceEngine::Extensions::Cpu::CpuExtensions>(), "CPU");
InferenceEngine::CNNNetReader netReader;
netReader.ReadNetwork(detectorXmlPath);
netReader.getNetwork().setBatchSize(1);
netReader.ReadWeights(detectorBinPath);
InferenceEngine::InputsDataMap inputInfo(netReader.getNetwork().getInputsInfo());
.....
to deploy my App to a third party machine I need to install OpenVINO on the machine following the regular procedure (https://docs.openvinotoolkit.org/latest/_docs_install_guides_installing_openvino_linux.html) and to deploy my App as I usually do, the dependencies are then correctly resolved.
My last two cents: I am in direct contact with Intel, which is supporting me with the OpenVINO integration, according to them "all the .so files in in /deployment_tools/inference_engine/lib/intel64, from /deployment_tools/inference_engine/external/mkltiny_lnx/lib, and /deployment_tools/inference_engine/external/tbb/lib are pretty much all the dependencies required", I still didn't have the time to confirm that yet