使用cmake在项目中链接Opencv

Question

使用cmake在项目中链接Opencv

4

我安装了两个OpenCV，一个在/usr/local，另一个在/usr。因此，/usr/share/OpenCV中有OpencvConfig.cmake适用于Opencv2.4.10，而/usr/local/share/OpenCV中有OpencvConfig.cmake适用于Opencv3.1.0。在我的项目的cmake中，我将OPencv2.4.10的路径设置为

cmake_minimum_required(VERSION 2.8)
project(five-point-nister)

SET("OpenCV_DIR" "/usr/share/OpenCV")
find_package( OpenCV REQUIRED )

add_executable(five-point-nister
    five-point.cpp precomp.cpp modelest.cpp)
target_link_libraries(five-point-nister ${OpenCV_LIBS})

但是当我编译项目时，项目会尝试链接到OPencv3.1.0，导致出现错误：

In file included from /usr/local/include/opencv2/core.hpp:59:0,
                 from /usr/local/include/opencv2/calib3d.hpp:47,
                 from /usr/local/include/opencv2/calib3d/calib3d.hpp:48,

按照正确的路径应该是/usr/include/opencv2，但现在是/usr/local/include/opencv2。所以我的项目仍然连接到Opencv3.1.0。我该如何纠正它？谢谢

- batuman

变量 OpenCV_LIBS 和 OpenCV_INCLUDE_DIRS 的内容是什么？ - Tsyvarev

1个回答

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- uelordi · Accepted Answer

我猜您使用apt-get install安装了OpenCV，如果我猜错了，请告诉我。

首先展示opencvConfig.cmake变量，例如OpenCV_INCLUDE_DIRS或OpenCV_LIBS。

您可以使用以下代码：

  cmake_minimum_required(VERSION 2.8)
  project(five-point-nister)
  SET("OpenCV_DIR" "/usr/share/OpenCV")
  find_package( OpenCV REQUIRED )

  MESSAGE(STATUS "Include dirs ${OpenCV_INCLUDE_DIRS}")
  MESSAGE(STATUS "LINK LIBRARIES ${OpenCV_LIBS}")

  add_executable(five-point-nister
  five-point.cpp precomp.cpp modelest.cpp)
  target_link_libraries(five-point-nister ${OpenCV_LIBS})

这些变量位于 OpencvConfig.cmake 文件中，例如：

#    This file will define the following variables:
#      - OpenCV_LIBS                     : The list of all imported targets for OpenCV modules.
#      - OpenCV_INCLUDE_DIRS             : The OpenCV include directories.
#      - OpenCV_COMPUTE_CAPABILITIES     : The version of compute capability.
#      - OpenCV_ANDROID_NATIVE_API_LEVEL : Minimum required level of Android API.
#      - OpenCV_VERSION                  : The version of this OpenCV build: "2.4.9"
#      - OpenCV_VERSION_MAJOR            : Major version part of OpenCV_VERSION: "2"
#      - OpenCV_VERSION_MINOR            : Minor version part of OpenCV_VERSION: "4"
#      - OpenCV_VERSION_PATCH            : Patch version part of OpenCV_VERSION: "9"
#      - OpenCV_VERSION_TWEAK            : Tweak version part of OpenCV_VERSION: "0"

然而，我建议您一些提示：

使用cmake-gui来定义您的OPENCV_DIR目录，因为它是您的静态目录路径。

不要使用apt-get安装openCV，有时更新不足够。
尝试编译opencv或下载预构建文件http://opencv.org/downloads.html。
编译opencv并在您之前编译的构建目录中设置您的应用程序项目中的OPENCV_DIR。

干杯。