shawnzhang31/mac-opencv-qt5.6

mac qt5.6 opencv

Mac+QT5+OpenCV

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Mac上OpenCV的安装

1. 首先检查OpenCV是否安装成功

brew info opencv

2. 安装OpenCV必须的依赖工具Cmake

brew install cmake

3. 安装OpenCV

• 安装OpenCV 2.4.X

brew tap homebrew/science
brew install opencv

• 安装OpenCV 3

brew tap homebrew/science
brew install opencv3

在mac上安装OpenCV3的详细教程，可以参阅:http://www.learnopencv.com/install-opencv-3-on-yosemite-osx-10-10-x/
在Mac上使用OpenCV3有点小问题，因为OpenCV3包含了一样的一些库文件，所以OpenCV3不是通过/usr/local/lib来部署连接其体的库文件的。

OpenCV在QT中的配置

1. 第一步，也是最重要的一步，找到pkg-config的存储位置。默认的pkg-config存储位置是：/usr/local/bin

which pkg-config
#returns /usr/local/bin/pkg-config

需要将/usr/local/bin添加到PATH中。打开构建环境,添加/usr/local/bin到PATH，不要忘记在之前添加":"。
如果使用的是OpenCV3还需要添加一个新的环境变脸：PKG_CONFIG_PATH,并将该环境变量的值设置为包含opencv.pc的目录，使用如下命令，你可以找到文件所在的目录:

find /usr/local -name "opencv.pc"
#/usr/local/Cellar/opencv3/3.3.0_3/lib/pkgconfig/opencv.pc

2. 配置在QT的工程设置中

• 我们需要添加一行配置告诉QT的qmake使用opencv的pkg-config来进行编译：

# The following lines tells Qmake to use pkg-config for opencv
QT_CONFIG -= no-pkg-config
CONFIG  += link_pkgconfig
PKGCONFIG += opencv

如果使用的是OpenCV3,编译器可能会报出如下错误（我的配置没有遇到这种错误）:

ld: library not found for -lippicv

如果遇到这种错误，可以使用如下方法修复:
编译器报出的ippicv库实际上就在OpenCV的安装目录下，但是没有连接正确，可以使用如下命令找到实际的安装位置：

find /usr/local/Cellar -name "libippicv*"
#/usr/local/Cellar/opencv3/3.3.0_3/share/OpenCV/3rdparty/lib/libippicv.a

可以将这个库添加到.pro文件中：

LIBS += -L/usr/local/Cellar/opencv3/3.3.0_3/share/OpenCV/3rdparty/lib

• 配置OpenCV的库文件

#OpenCV库文件
INCLUDEPATH +=-I/usr/local/Cellar/opencv/3.3.0_3/include
INCLUDEPATH +=-I/usr/local/Cellar/opencv/3.3.0_3/include/opencv
INCLUDEPATH +=-I/usr/local/Cellar/opencv/3.3.0_3/include/opencv2

LIBS += -L/usr/local/Cellar/opencv/3.3.0_3/lib -lopencv_stitching -lopencv_superres -lopencv_videostab -lopencv_photo -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_dpm -lopencv_face -lopencv_fuzzy -lopencv_img_hash -lopencv_line_descriptor -lopencv_optflow -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_phase_unwrapping -lopencv_surface_matching -lopencv_tracking -lopencv_datasets -lopencv_text -lopencv_dnn -lopencv_plot -lopencv_ml -lopencv_xfeatures2d -lopencv_shape -lopencv_video -lopencv_ximgproc -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_flann -lopencv_xobjdetect -lopencv_imgcodecs -lopencv_objdetect -lopencv_xphoto -lopencv_imgproc -lopencv_core

3. 查看OpenCV库文件的路径
   可以使用如下命令来查看安装的OpenCV在Mac中环境变量

pkg-config --cflags --libs opencv

使用如下命令，可以查看当前安装的所有库

pkg-config --list-all

如我的电脑查看到的OpenCV库文件的路径如下

-I/usr/local/Cellar/opencv/3.3.0_3/include/opencv -I/usr/local/Cellar/opencv/3.3.0_3/include -L/usr/local/Cellar/opencv/3.3.0_3/lib -lopencv_stitching -lopencv_superres -lopencv_videostab -lopencv_photo -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_dpm -lopencv_face -lopencv_fuzzy -lopencv_img_hash -lopencv_line_descriptor -lopencv_optflow -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_phase_unwrapping -lopencv_surface_matching -lopencv_tracking -lopencv_datasets -lopencv_text -lopencv_dnn -lopencv_plot -lopencv_ml -lopencv_xfeatures2d -lopencv_shape -lopencv_video -lopencv_ximgproc -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_flann -lopencv_xobjdetect -lopencv_imgcodecs -lopencv_objdetect -lopencv_xphoto -lopencv_imgproc -lopencv_core

4. 常见问题处理

• 如果出现如下错误：

dyld: Symbol not found: __cg_jpeg_resync_to_restart
  Referenced from: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
  Expected in: /usr/local/lib/libJPEG.dylib
 in /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
The program has unexpectedly finished.

修复这个问题需要去到:项目->运行->Run Environment下取消DYLD_LIBRARY_PATH的设置：