Open CV安装可能报错及原因-CFANZ编程社区

文章目录

七 opencv安装报错

fatal error: boostdesc_bgm.i: No such file or directory
fatal error: opencv2/xfeatures2d/cuda.hpp: No such file or directory
nonfree.hpp no such file
Perhaps you should add the directory containing `OpenCV.pc' to the PKG_CONFI

7.4 opencv cmake编译过程中的红色警告

七 opencv安装报错

这个错误并不常见，在我按照之前安装的步骤安装时一直没有错误。但有一次安装的时候死活报下面这个错误。一般这种情况时没配置PKG_CONFIG_PATH的变量。不过我弄好了，还是这样。后来发现是代码中的opencv库都用小写就行。

fatal error: opencv2/OpenCV: No such file or directory

代码

#include <opencv2/opencv.hpp> 
g++ -o main main.cpp `pkg-config --libs --cflags opencv`

虽说Linux大小写敏感，可是之前为什么就可以呢。
usr/local/include/中文件夹opencv2，文件名opencv.hpp都是小写。
遇到找不到文件，一方面利用find全局搜索，看看文件在哪里。包含路径进去另一方面，可以使用apt-file serach package名找出该缺失文件所在的包，然后将缺失的包安装

fatal error: boostdesc_bgm.i: No such file or directory

在执行sudo make -j8的过程中，有可能遇到这个编译错误，到这一步就是下载吧下来，这时候，直接解压压缩包里的所有文件，放到opencv_contrib/modules/xfeatures2d/src/路径下即可。
5
GitHub英文教程：https://github.com/opencv/opencv_contrib/issues/1301

fatal error: opencv2/xfeatures2d/cuda.hpp: No such file or directory

这个错误在github中找到了答案，因为需要把cuda.hpp的绝对路径替换掉，一般情况不会出现这种错误。
打开opencv-3.4.0/modules/stitching/include/opencv2/stitching/detail/matchers.hpp文件，将第52行的opencv2/xfeatures2d/cuda.hpp换成绝对路径/home/cw/mytool/opencv-3.4.6/opencv_contrib-3.4.6/modules/xfeatures2d/include/opencv2/xfeatures2d/cuda.hpp 没有cuda就找一下这两个OpenCV文件夹。

okay, I added this path “/home/cw/mytool/opencv-3.4.6/opencv_contrib-3.4.6/modules/xfeatures2d/include/opencv2/xfeatures2d/cuda.hpp” replacing 52 line that is “opencv2/xfeatures2d/cuda.hpp” in file which path is “opencv-3.4.0/modules/stitching/include/opencv2/stitching/detail/matchers.hpp”

https://github.com/opencv/opencv_contrib/issues/1534

nonfree.hpp no such file

https://www.freesion.com/article/3840595876/

Perhaps you should add the directory containing `OpenCV.pc’ to the PKG_CONFI

大小写的问题，其实在/usr/local/lib/pkgconfig/中有opencv.hpp，并且/usr/local/lib/pkgconfig/也加入了pkgconfig的路径中，只是因为g++ -o main main.cpppkg-config --libs --cflags OpenCV`一开始是大写，所以才找不到OpenCV.pc。

7.4 opencv cmake编译过程中的红色警告

CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
  IPPICV: Download failed: 7;"Couldn't connect to server"

  For details please refer to the download log file:

  /home/dji/Downloads/opencv-4.5.0/build/CMakeDownloadLog.txt

Call Stack (most recent call first):
  3rdparty/ippicv/ippicv.cmake:37 (ocv_download)
  cmake/OpenCVFindIPP.cmake:244 (download_ippicv)
  cmake/OpenCVFindLibsPerf.cmake:12 (include)
  CMakeLists.txt:696 (include)

以前ippicv下载吧成功是无法构建的。现在可以忽略，但还是建议根据这个log解决问题。根据CMakeDownloadLog.txt指定的版本下载。
如果你照着网上的各种教程去下载文件并且各种转移就落了下乘。报错的原因是无法连接到网络。去报错提示的/home/dji/Downloads/opencv-4.5.0/build/CMakeDownloadLog.txt看知道有这么一段话：
TCP_NODELAY set Connected to raw.githubusercontent.com (151.101.0.133) port 443 (#0) schannel: SSL/TLS connection with raw.githubusercontent.com port 443 (step 1/3) schannel: disabled server certificate revocation checks schannel: sending initial handshake data: sending 199 bytes... 连不上
raw.githubusercontent.com
因为被墙了。
在网址https://www.ipaddress.com/中搜索raw.githubusercontent.com，我这里显示ip是199.232.68.133 执行以下操作。（你看到的ip可能和我的不一样。这是一种临时解决方案。）

sudo vi /etc/hosts
199.232.68.133 raw.githubusercontent.com#文件末尾添加这段话