Imshow produces many windows(c++, Visualstudio)

asked 2017-11-16 07:55:49 -0500

esconda gravatar image

updated 2017-11-16 07:57:46 -0500

I just would like to run opencv project in Visual Studio.I set all necessarry variables , directory include files and succesfully builded example project.

The only problem is; Imshow command produces many window when I run the program.I try to get frames as a Video using videocapture and I am using opencv 2412 x86 version for windows.

My example code:

#include <opencv2/highgui/highgui.hpp>
#include <opencv2/opencv.hpp>

using namespace std;
using namespace cv;

int main()
Mat kernel;
Mat_<float> kernel1(3, 3);
int kernel_size;
int ind = 0;
VideoCapture cap(0); // open the default camera
if (!cap.isOpened())  // check if we succeeded
    return -1;

Mat edges;
Mat frame;
while (true)

    cap>>frame; // get a new frame from camera

    imshow("Livestream", frame);

    if (waitKey(30) == 27) //wait for 'esc' key press for 30 ms. If 'esc' key is pressed, break loop
        cout << "esc key is pressed by user" << endl;
// the camera will be deinitialized automatically in VideoCapture destructor
return 0;


After compiling(Pictures):

image description

As you see, Imshow produces many frame and window with different names(strange window names) after compiling the program.

Any help would be apreciated.

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mostly, problems like this are due to linking the wrong libs. (e.g. debug libs with release build of your prog)

" I am using opencv 2412 x86 version for windows." -- did you build those, locally ? (to my knowledge the prebuild libs are for vs2015, x64 ONLY)

berak gravatar imageberak ( 2017-11-16 08:03:14 -0500 )edit

I will use another version and inform you about that.

esconda gravatar imageesconda ( 2017-11-16 08:20:03 -0500 )edit

I chose opencv 3.0 version for visualstudio and I built opencv with "cmake -gui" for visualstudio2013,It created 2 types of files which is x64 and x86 version to be used in Visual studio.Then I correctly linked everything like libraries, include file etc(opencv_world300.lib , opencv_ts300.lib ,opencv_ts300d.lib opencv_world300d.lib) .It shows nothing now, no window appears.The program succesfully builded but , it shows nothing after I run the program.The program directly closes itself with exit code : -1073741515 (0xc0000135) 'A dependent dll was not found'.

esconda gravatar imageesconda ( 2017-11-16 08:51:03 -0500 )edit

please link either opencv_world300.lib or opencv_world300d.lib, but never both !

(and you do not need the ts libs at all, they're only for building unit tests)

berak gravatar imageberak ( 2017-11-16 09:28:16 -0500 )edit

Hi berak, I tried all solution for this operation.But unfortunately it gives me same error.Visual studio directly close my program with exit code : 'BarcodeRecognition.exe' (Win32): Loaded 'C:\Windows\SysWOW64\tmumh\20019\TmMon\\tmmon.dll'. Cannot find or open the PDB file. The program '[7440] BarcodeRecognition.exe' has exited with code -1073741515 (0xc0000135) 'A dependent dll was not found'.

esconda gravatar imageesconda ( 2017-11-17 01:11:05 -0500 )edit
  • Loaded 'C:\Windows\SysWOW64\tmumh\20019\TmMon\\tmmon.dll' -- 32 / 64 bit mismatch.
  • Cannot find or open the PDB file. -- that's a warning, not an error.

in the end: -- your problems are all about setting up your project, and using your ide correctly.

berak gravatar imageberak ( 2017-11-17 01:19:51 -0500 )edit

I solved it copying dll files for opencv libraries to inside of my main Visual studio application file.Thank you for your help, it works very well now

esconda gravatar imageesconda ( 2017-11-18 15:17:55 -0500 )edit