Get a opencv_gpu function working in Qt5 - c++

Question

I have an OpenSUSE 13.2 System with Qt5 and OpenCV installed with cudasupport. The Hardware is an Intel i5 processor with an integrated intel gpu chip and a NVidia GForce 940 M and i have tried to compile this file.
#include <iostream>
#include <time.h>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/opencv.hpp"
#include "opencv2/gpu/gpu.hpp"
using namespace std;
int main()
{
try
{
cv::Mat dst_mat;
cv::Mat src_host = cv::imread("/home/peter/testCuda/testCuda/GothaOrangerie.JPG", CV_LOAD_IMAGE_GRAYSCALE);
cv::namedWindow("Result",cv::WINDOW_NORMAL);
cv::imshow("Result", src_host);
cv::waitKey();
cv::gpu::GpuMat dst, src;
src.upload(src_host);
clock_t t = clock();
cv::gpu::threshold(src, dst, 128.0, 255.0, CV_THRESH_BINARY);
t = clock() -t;
cv::Mat result_host(dst);
cout << ((float)t)/CLOCKS_PER_SEC << endl;
cv::imshow("Result", result_host);
cv::waitKey();
t = clock();
cv::threshold(src_host, dst_mat, 128.0, 255.0, CV_THRESH_BINARY);
t = clock() -t;
cout << ((float)t)/CLOCKS_PER_SEC << endl;
cv::imshow("Result", dst_mat);
cv::waitKey();
}
catch(const cv::Exception& ex)
{
cout << "Error: " << ex.what() << endl;
}
return 0;
}
The compilation in the shell with
g++ main.cpp -o threshold `pkg-config --cflags --libs opencv` -lopencv_gpu -L/usr/local/cuda-7.5/lib64
works pretty well i can run the small program without any issues. If i try it with the Qt5 IDE it returns me this error.
OpenCV Error: No GPU support (The library is compiled without CUDA support) in mallocPitch, file /home/abuild/rpmbuild/BUILD/opencv-2.4.9/modules/dynamicuda/include/opencv2/dynamicuda/dynamicuda.hpp, line 126
Error: /home/abuild/rpmbuild/BUILD/opencv-2.4.9/modules/dynamicuda/include/opencv2/dynamicuda/dynamicuda.hpp:126: error: (-216) The library is compiled without CUDA support in function mallocPitch
If i run the shellcompiled program with this command
optirun ./threshold
i get the same error.
The .pro File is
#-------------------------------------------------
#
# Project created by QtCreator 2015-10-15T04:02:07
#
#-------------------------------------------------
TARGET = testCuda
LIBS += -L/usr/lib64/
LIBS += -L/usr/local/cuda-7.5/lib64 -lopencv_gpu
LIBS += `pkg-config opencv --cflags --libs`
SOURCES += main.cpp
and the Qt compilation command is
22:58:12: Running steps for project testCuda...
22:58:12: Configuration unchanged, skipping qmake step.
22:58:12: Starting: "/usr/bin/make"
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I../testCuda -I/usr/include/QtCore -I/usr/include/QtGui -I/usr/include -I. -I../testCuda -I. -o main.o ../testCuda/main.cpp
g++ -Wl,-O1 -o testCuda main.o -L/usr/lib64 -L/usr/lib64/ -L/usr/local/cuda-7.5/lib64 -lopencv_gpu `pkg-config opencv --cflags --libs` -lQtGui -L/usr/lib64 -L/usr/X11R6/lib -lQtCore -lpthread
22:58:13: The process "/usr/bin/make" exited normally.
22:58:13: Elapsed time: 00:01.
Anybody an idea how to fix that?

Answer 1

Deinstalling the preinstalled libopencv-2.4.9 package solved it.