Build Application with Static Libraries

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Hi all,

I'm trying to statically link my C++ (CMake) application to run on another computer which does not have OpenCV installed.

So far,

1. I built OpenCV from source by setting BUILD_SHARED_LIBS to OFF, so I can see library files under lib directory. (with .a extension)

2. I edited the environment variable for the new build of OpenCV, my IDE does see include directories and files, so this step also seems ok.

3. Added "-static" parameter to target_link_libraries command in CMake:

target_link_libraries(HoGPeopleDetector ${OpenCV_LIBS} "-static")

Then rebuilt the application, EXE size increased to 1.6 MB from 200 KB. So I guess linking process was successful.

The application works well when I run it within my IDE. However, when I try to run it from the EXE file, it still expects DLL files. (libopencv_core310.dll and maybe more)

IDE: CLion 2017.1.2 OpenCV: 3.1

Program Code:

#include <iostream>
#include <opencv2/objdetect.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/video.hpp>

using namespace cv;
using namespace std;

static void detectAndDraw(const HOGDescriptor &hog, Mat &img)
{
vector<Rect> found, found_filtered;

hog.detectMultiScale(img, found, 0, Size(8,8), Size(32,32), 1.05, 2);

for(size_t i = 0; i < found.size(); i++ )
{
    Rect r = found[i];

    size_t j;

    for ( j = 0; j < found.size(); j++ )
        if ( j != i && (r & found[j]) == r )
            break;

    if ( j == found.size() )
        found_filtered.push_back(r);
}

for (size_t i = 0; i < found_filtered.size(); i++)
{
    Rect r = found_filtered[i];

    r.x += cvRound(r.width*0.1);
    r.width = cvRound(r.width*0.8);
    r.y += cvRound(r.height*0.07);
    r.height = cvRound(r.height*0.8);
    rectangle(img, r.tl(), r.br(), cv::Scalar(0,255,0), 3);
}
}

int main(int argc, char** argv)
{

cout << "Cikis icin Q ya da ESC ye basin\n";

HOGDescriptor hog;
hog.setSVMDetector(HOGDescriptor::getDefaultPeopleDetector());
namedWindow("people detector", 1);

string pattern_glob = "";
string video_filename = "C:\\OpenCV\\video.mp4";

VideoCapture vc;
Mat frame;


vc.open(video_filename.c_str());
if (!vc.isOpened())
    throw runtime_error(string("Dosya acilamadi: " + video_filename));


for (;;)
{
    vc >> frame;

    if (frame.empty())
        break;

    detectAndDraw(hog, frame);

    imshow("people detector", frame);
    int c = waitKey( vc.isOpened() ? 10 : 0 ) & 255;
    if ( c == 'q' || c == 'Q' || c == 27)
        break;
}

return 0;
}

CMake:

cmake_minimum_required(VERSION 3.7)
project(HoGPeopleDetector)

set(CMAKE_CXX_STANDARD 11)

find_package(OpenCV REQUIRED)

set(SOURCE_FILES main.cpp)
add_executable(HoGPeopleDetector ${SOURCE_FILES})

target_link_libraries(HoGPeopleDetector ${OpenCV_LIBS} "-static")