qt opencv can't read the image

Question

I'm quite new around the qt creator and I'm sick of it's building errors and tones of undefined errors. Eventually i installed opencv3.2 with no error. Noti can use opencv libraries but i can't read the files like "image.jpg". I tried everything. Path is %100 correct slashes are correct. There were no error during the cmake installation. Pls give me hand :D


LIBS += C:\opencv3.2\build\bin\libopencv_core320.dll
LIBS += C:\opencv3.2\build\bin\libopencv_highgui320.dll
LIBS += C:\opencv3.2\build\bin\libopencv_imgcodecs320.dll
LIBS += C:\opencv3.2\build\bin\libopencv_imgproc320.dll
LIBS += C:\opencv3.2\build\bin\libopencv_features2d320.dll
LIBS += C:\opencv3.2\build\bin\libopencv_calib3d320.dll

try {
     Mat image = imread("D:\\Adsız.jpeg",0);
     if (!image.data)
         cout << "Data is empty" << endl;
    
     namedWindow("My image");
     imshow("My image",image);
     waitKey();
} catch (const exception& e) {

}

Output

10:50:24: Starting C:\Users\YUNUS EMRE\Qt Workspace\build-OpenCVTest-Desktop_Qt_5_15_0_MinGW_32_bit-Release\release\OpenCVTest.exe ...
Data is empty
OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file C:\opencv3.2\sources\modules\highgui\src\window.cpp, line 312
[]10:50:27: C:\Users\YUNUS EMRE\Qt Workspace\build-OpenCVTest-Desktop_Qt_5_15_0_MinGW_32_bit-Release\release\OpenCVTest.exe exited with code 0

It returns empty image.

Something here might be relevant https://stackoverflow.com/questions/7417637/imread-not-working-in-opencv — Alan Birtles, Aug 16 '20 at 08:06
Are you sure that the image actually exists at the path you specified? Also I don't think you can leave the flags `0`. See https://docs.opencv.org/3.4/d4/da8/group__imgcodecs.html#ga288b8b3da0892bd651fce07b3bbd3a56 — Jan Schultke, Aug 16 '20 at 09:04
yes %100 sure the path is correct. I tried waitkey(0), waitkey(5000) and nothing is changed — Yunus Emre KÜTÜK, Aug 16 '20 at 09:05
Did you add `INCLUDEPATH += D:\opencv\build\include` too like LIBS ? — Yunus Temurlenk, Aug 16 '20 at 10:16

score 1 · Accepted Answer · answered Aug 16 '20 at 16:31

1

I solved the problem by installing Opencv 4.4.0 . It was a little bit hard to install but i figured it out thanks for replies.

answered Aug 16 '20 at 16:31

Yunus Emre KÜTÜK

65
7

qt opencv can't read the image

1 Answers1