ubuntu18上Qt5移植Opencv3.2.0 遇到的坑

编译报错1

1. 报错信息

   找不到Mat类的定义
   

2. 检查以下几个地方

   //包含头文件和命名空间
   #include <opencv2/opencv.hpp>
   using namespace cv;
   

   工程文件中添加要链接的库，在原有的内容上添加如下的内容 
   INCLUDEPATH += /usr/local/opencv
   INCLUDEPATH += /usr/local/opencv2
   
   CONFIG(debug, debug|release): {
   LIBS += -L/usr/local/lib \
   -lopencv_core \
   -lopencv_imgproc \
   -lopencv_highgui\
   -lopencv_ml \
   -lopencv_video \
   -lopencv_features2d \
   -lopencv_calib3d\
   -lopencv_objdetect \
   -lopencv_imgcodecs\
   -lopencv_flann
   } else:CONFIG(release, debug|release): {
   LIBS += -L/usr/local/lib \
   -lopencv_core \
   -lopencv_imgproc \
   -lopencv_highgui\
   -lopencv_ml \
   -lopencv_video \
   -lopencv_features2d \
   -lopencv_calib3d\
   -lopencv_objdetect \
   -lopencv_imgcodecs\
   -lopencv_flann
   }
   
   

编译报错2

1. 报错信息

   17:33:33: Starting /home/linux/study/QOpencv/build-1-OpencvTest-Desktop_Qt_5_14_0_GCC_64bit-Debug/1-OpencvTest ...
   Gtk-Message: 17:33:33.748: Failed to load module "canberra-gtk-module"
   OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file /home/linux/tool/Opencv3/opencv/modules/highgui/src/window.cpp, line 304
   terminate called after throwing an instance of 'cv::Exception'
     what():  /home/linux/tool/Opencv3/opencv/modules/highgui/src/window.cpp:304: error: (-215) size.width>0 && size.height>0 in function imshow
   
   

2. 解决办法

   $ sudo apt-get install libcanberra-gtk-module 
   

编译报错3

1. 报错信息

   17:57:16: Starting /home/linux/study/QOpencv/build-1-OpencvTest-Desktop_Qt_5_14_0_GCC_64bit-Debug/1-OpencvTest ...
   OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file /home/linux/tool/Opencv3/opencv/modules/highgui/src/window.cpp, line 304
   terminate called after throwing an instance of 'cv::Exception'
     what():  /home/linux/tool/Opencv3/opencv/modules/highgui/src/window.cpp:304: error: (-215) size.width>0 && size.height>0 in function imshow
   

2. 解决办法

   图片文件的路径写绝对路径