链接错误-Qt Creator OpenCV Ubuntu

Question

I am currently having a link error with Qt. I cant compile my code since i got the error message:

 error: undefined reference to `cv::imread(cv::String const&, int)'

Heres the content of my .pro

QT       += core

QT       -= gui

TARGET = edge_detection
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app


SOURCES += main.cpp


INCLUDEPATH += /usr/local/include/opencv
INCLUDEPATH += /usr/local/include/opencv2
LIBS += -L/usr/local/lib
LIBS += -lopencv_core
LIBS += -lopencv_imgproc
LIBS += -lopencv_highgui

Heres my simple code:

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>


int main(){

    cv::Mat img;

    img=cv::imread("/home/cgross/Downloads/2.jpg");


    return 0;


}

I am not sure of where is the problem

Answer 1

includepath must show opencv and opencv2.just like that:

INCLUDEPATH += C:\\opencv-2.4.6.1\\build-msvc2012\\install\\include
 LIBS+=-LC:\\opencv-2.4.6.1\\build-msvc2012\\install\\lib \
 -lopencv_calib3d246d \
 -lopencv_contrib246d \
 -lopencv_core246d \
 -lopencv_features2d246d \
 -lopencv_flann246d \

lıbs must show .lib file

Answer 2

Your code builds and runs just fine for me on a somewhat antique stock ubuntu 12.10 with opencv 2.3 from the distribution packages.

It picks up a cv::imread(std::string const &, int) from libopencv_highgui.