在Ubuntu 18.04上安装qt和opencv3.4.1
1.查看python版本
$ python3 --version
Python 3.6.5
2.
$ python3
>> print("OpenCV + Ubuntu 18.04!")
OpenCV + Ubuntu 18.04!
>> quit()
3.
$ sudo apt-get update
$ sudo apt-get upgrade
4.
$ sudo apt-get install build-essential cmake unzip pkg-config（重点）
$ sudo apt-get install libjpeg-dev libpng-dev libtiff-dev
$ sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
$ sudo apt-get install libxvidcore-dev libx264-dev
$ sudo apt-get install libgtk-3-dev
$ sudo apt-get install libatlas-base-dev gfortran
$ sudo apt-get install python3-dev
4.
$ unzip opencv.zip
$ unzip opencv_contrib.zip
5.
sudo apt-get install libopencv-dev（这是我当时缺少的）
sudo apt-get update
6.
/opt$ cd opencv
/opt/opencv$ mkdir release
/opt/opencv$ cd release
/opt/opencv/release$ cmake -D BUILD_TIFF=ON -D WITH_CUDA=OFF -D ENABLE_AVX=OFF -D WITH_OPENGL=OFF -D WITH_OPENCL=OFF -D WITH_IPP=OFF -D WITH_TBB=ON -D BUILD_TBB=ON -D WITH_EIGEN=OFF -D WITH_V4L=OFF -D WITH_VTK=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_EXTRA_MODULES_PATH=/opt/opencv_contrib/modules /opt/opencv/
/opt/opencv/release$ make -j4
/opt/opencv/release$ make install
/opt/opencv/release$ ldconfig
/opt/opencv/release$ exit
/opt/opencv/release$ cd ~
安装完毕
安装qt
打开QtCreator，点击File，选择New File or Project，选择None-Qt Project,选择Plain C++ Project，点击choose ，然后基本都选默认的就行。项目建立完成后就会看到一个*.pro文件，修改.pro文件中的内容，如下：
QT += core
QT -= gui
TARGET = opencv_test
CONFIG += console
CONFIG -= app_bundle
INCLUDEPATH += /usr/local/include \
/usr/local/include/opencv \
/usr/local/include/opencv2
LIBS += /usr/local/lib/libopencv_highgui.so \
/usr/local/lib/libopencv_core.so \
/usr/local/lib/libopencv_imgproc.so \
/usr/local/lib/libopencv_imgcodecs.so
TEMPLATE = app
SOURCES += main.cpp
将下面的cpp文件copy 到main.cpp中：
#include
int main()
{
cv::Mat image = cv::imread("/home/Picture/153.jpg", cv::IMREAD_COLOR);
cv::imshow("Hepburn",image);
cv::waitKey(0);
return 0;
}