ubuntu下opencv2.4.10 和 opencv 3.10 多版本切换问题

客官°小女子只卖身不卖艺 2022-05-28 13:47 483阅读 0赞

1.由于需要，之前系统中是opencv2.4.10版本，后来安装opencv3.10版本，并支持多版本切换。通过以下命令可以查看opencv版本

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1.  pkg-config --modversion opencv

2.如果编译好并安装了opencv3.10版本，想切换到3.10版本，可以通过如下的方式，

通过修改bashrc文件来设置PKG\_ CONFIG\_PATH 和 LD\_LIBRARY\_PATH的路径来选择对应的opencv版本

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1.  sudo gedit ~/.bashrc

并在文件的默认追加新编译的3.10版本的路径，也就是cmake时：CMAKE\_INSTALL\_PREFIX=/usr/local/opencv/3.10

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1.  export PKG\_CONFIG\_PATH=/usr/local/opencv/3.10/lib/pkgconfig
2.  export LD\_LIBRARY\_PATH=/usr/local/opencv/3.10/lib

然后执行命令，后面用pkg-config --modversion opencv 查看opencv版本的时候就是3.10版本

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1.  source ~/.bashrc

3.上面的这些过程并不能保证在写makefile中调用的是3.10版本的库，可能还是调用之前的2.4.10的库，具体还是要在CMakeList.txt中指定要找的opencv的目录，

opencv3.10的编译目录 /usr/local/opencv-3.1.0/build 下找到 OpenCVConfig.cmake 文件，并在CMakeList.txt中添加对应的路径信息。这样cmake的时候调用的就是3.10的库，想切换成原来的2.4.10版本只需将第二步的 bashrc文件和CMakeList.txt文件中修改的内容改成对应的opencv2.4.10的位置就好了。

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1.  \# cmake needs this line
2.  cmake\_minimum\_required(VERSION 2.8)
3.  set (OpenCV\_DIR "/usr/local/opencv-3.1.0/build")
4.  \# Define project name
5.  project(myTest)
6.  \# Find OpenCV, you may need to set OpenCV\_DIR variable
7.  \# to the absolute path to the directory containing OpenCVConfig.cmake file
8.  \# via the command line or GUI
9.  find\_package(OpenCV REQUIRED)
10. \# If the package has been found, several variables will
11. \# be set, you can find the full list with descriptions
12. \# in the OpenCVConfig.cmake file.
13. \# Print some message showing some of them
14. message(STATUS "OpenCV library status:")
15. message(STATUS " version: $\{OpenCV\_VERSION\}")
16. message(STATUS " libraries: $\{OpenCV\_LIBS\}")
17. message(STATUS " include path: $\{OpenCV\_INCLUDE\_DIRS\}")
18. if(CMAKE\_VERSION VERSION\_LESS "2.8.11")
19.  \# Add OpenCV headers location to your include paths
20. include\_directories($\{OpenCV\_INCLUDE\_DIRS\})
21. endif()
22. \# Declare the executable target built from your sources
23. add\_executable(demo demo.cpp)
24. \# Link your application with OpenCV libraries
25. target\_link\_libraries(demo $\{OpenCV\_LIBS\})

## **【注意事项】** ##

**1、find\_package(OpenCV REQUIRED)中的OpenCV一定要遵循该大小写。**  
　　因为该句话是根据OpenCV作为前缀自动去/usr/local/share/OpenCV（如果你的opencv安装时，默认前缀设置为：/usr/local时）文件夹中去找OpenCVConfig.cmake，OpenCV-config.cmake 两个文件，进而确定你要引入的opencv头文件和库函数在哪里。

**2、自定义引入相应opencv版本**  
　　如果你有很多的opencv版本，尤其是一个是opencv2.x.x一个是opencv3.x.x，因为2和3在数据结构上有相对较大的变化，所以如果引入错误的版本可能导致程序的无法运行。因为find\_package找默认路径下的OpenCV，但是很多时候安装多个版本的库的时候都会make install在opt目录下。、

安装在opt的文件中会有share文件夹，这里面就有咱们需要的ＯｐenCV文件夹，所以如果要自己有选择的控制版本，则在find\_package这句话前面去设置opencv的ＯpenCV文件夹在哪里，添加**set(OpenCV\_DIR /opt/opencv-2.4.11/share/OpenCV)**这句话。因为我的opencv2.4.11版本install在/opt/opencv-2.4.11文件夹下。这个可以根据你install的位置去变化。

cmake\_minimum\_required(VERSION 2.8)  
project( DisplayImage )  
  
\#链接opencv2  
set(OpenCV\_DIR /usr/local/share/OpenCV)  
  
find\_package(OpenCV REQUIRED)  
  
INCLUDE\_DIRECTORIES($\{OpenCV\_INCLUDE\_DIRS\})  
\# 添加头文件  
include\_directories( $\{OpenCV\_INCLUDE\_DIRS\} )  
  
message(STATUS "OpenCV library status:")  
message(STATUS " version: $\{OpenCV\_VERSION\}")  
message(STATUS " libraries: $\{OpenCV\_LIBS\}")  
message(STATUS " include path: $\{OpenCV\_INCLUDE\_DIRS\}")  
  
  
add\_executable( DisplayImage DisplayImage.cpp )  
  
  
target\_link\_libraries( DisplayImage $\{OpenCV\_LIBS\} )

[view plain]: https://blog.csdn.net/kekong0713/article/details/53688131#