使用 cmake 在项目中链接 Opencv

Question

我安装了两个 opencv，一个在 /usr/local 中，另一个在 /usr 中。所以 /usr/share/OpenCV 有 Opencv2.4.10 的 OpencvConfig.cmake 和 /usr/local/share/OpenCV 有 Opencv3.1.0 的 OpencvConfig.cmake。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，该项目试图链接到 OPencv3.1.0 并且错误是

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,

没错，它应该是/usr/include/opencv2，但现在是/usr/local/include/opencv2。所以我的项目仍然链接到Opencv3.1.0。我该如何纠正？谢谢

Answer 1

我猜你是用apt-get install来安装opencv的，如果我错了请告诉我。

首先显示 OpenCV_INCLUDE_DIRS 或 OpenCV_LIBS 等 opencvConfig.cmake 变量。

您可以使用此代码：

  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})

这些变量位于您的 OpencvConfig.cmake 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"

但是，我会推荐一些提示：

由于您的静态目录路径，使用 cmake-gui 定义您的 OPENCV_DIR 目录。

• 不要用apt-get install openCV，有时候更新不够。

• 尝试编译 opencv 或下载预建文件http://opencv.org/downloads.html。

• 编译 opencv 并在您之前编译的构建目录中为您的应用项目设置您的 OPENCV_DIR。

干杯。