OpenCV Display window title corrupted and multiple windows show

I had a very strange (and annoying problem) with an OpenCV project in VS2012, when my program created an image display window (namedWindow) I noticed that its window title was all garbled and soon afterwards other display windows were created even though the code had not requested them.

I spent a lot of time comparing the VS2012 projects settings with those of another working project and eventually found that I could make the problem go away by adding this to the ‘Preprocessor Definitions’ setting:

_ITERATOR_DEBUG_LEVEL=0

I have no idea at the moment why adding this fixed the problem but it did! I must have added it to the working project (which was born inside VS2010) but I can’t remember why!

7 replies
  1. Rajshekar Prabhakar
    Rajshekar Prabhakar says:

    PROBLEMS:
    1) Same as above
    2) Unable to load image into CV::Mat from a file, image size was 0 x 0 and
    Error: ” OpenCV Error: Assertion failed (size.width)0 && size.height)0) in cv::imshow, file C\builds\2_4_PackSlave-win64-vc12-shared\opencv\modules\highgui\src\window.cpp, line 261″ when trying to display image to window.

    MY SYSTEM CONFIG:
    Windows 8.1 x64
    OpenCV 2.4.8 with pre-built libs of VS 2012
    QtCreator 5.2 MSVC 2012 x64
    VS 2013 debugger

    SOLUTION:
    Adding the below line in .pro file of Qt Creator project solved both the problems.

    DEFINES += _ITERATOR_DEBUG_LEVEL=0

    Thank you!
    Rajshekar Prabhakar

    Reply
  2. Trønder
    Trønder says:

    This also happened to solve errors causing the program to request the release versions of DLLs even though I was compiling for debug.

    Thank you!

    Reply

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