opencv 编译

0. 准备

安装cuda，cudnn；

修改github clone代理

zjr@zjr:~/disk/prjs/data/src/mdw/middleware_hal_camera/3rd/x86/opencv/build$ cat ~/.gitconfig 
[url "https://ghproxy.com/https://github.com"]
    insteadOf = https://github.com

1. 下载

git clone https://ghproxy.com/https://github.com/opencv/opencv.git
cd opencv && git checkout 4.5.5 -b b_4.5.5

2. IPPICV ade github下载失败的问题，可添加github代理

diff --git a/3rdparty/ippicv/ippicv.cmake b/3rdparty/ippicv/ippicv.cmake
index 257af6fcc6..aeb2db6dae 100644
--- a/3rdparty/ippicv/ippicv.cmake
+++ b/3rdparty/ippicv/ippicv.cmake
@@ -39,7 +39,7 @@ function(download_ippicv root_var)
                URL
                  "${OPENCV_IPPICV_URL}"
                  "$ENV{OPENCV_IPPICV_URL}"
-                 "https://raw.githubusercontent.com/opencv/opencv_3rdparty/${IPPICV_COMMIT}/ippicv/"
+                 "https://ghproxy.com/https://raw.githubusercontent.com/opencv/opencv_3rdparty/${IPPICV_COMMIT}/ippicv/"
                DESTINATION_DIR "${THE_ROOT}"
                ID IPPICV
                STATUS res
diff --git a/modules/gapi/cmake/DownloadADE.cmake b/modules/gapi/cmake/DownloadADE.cmake
index aa24e949ea..56aabfd119 100644
--- a/modules/gapi/cmake/DownloadADE.cmake
+++ b/modules/gapi/cmake/DownloadADE.cmake
@@ -7,7 +7,7 @@ ocv_download(FILENAME ${ade_filename}
              URL
                "${OPENCV_ADE_URL}"
                "$ENV{OPENCV_ADE_URL}"
-               "https://github.com/opencv/ade/archive/"
+               "https://ghproxy.com/https://github.com/opencv/ade/archive/"
              DESTINATION_DIR ${ade_src_dir}
              ID ADE
              STATUS res

3. opencv_cudev报错

CMake Error at modules/core/CMakeLists.txt:55 (message):
  CUDA: OpenCV requires enabled 'cudev' module from 'opencv_contrib'
  repository: https://github.com/opencv/opencv_contrib

手动clone，参考opencv_contrib的README，添加cmake flag: -DOPENCV_EXTRA_MODULES_PATH

cmake -DWITH_CUDA=1 -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules ..

 4. 编译

mkdir build && cd build && cmake -DWITH_CUDA=1 -DWITH_CUDNN=1 -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules ..