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编译opencv
1.安装cmake和cmake-gui工具：
sudo apt install cmake
sudo apt install cmake-gui
2.在命令行输入cmake-gui ，打开cmake-gui，在where is the source code，输入opencv的项目，在where to build the binaries，输入项目的编译文件build：
3.然后点击configure，出现一下的界面 ：
4.选择第三个选项，得到以下的界面，选择opencv源文件的tootchain文件：opencv-3.4.11/platforms/linux/aarch64-gnu.toolchain.cmake
最后点击generate，在build文件里编译命令：make -j8
编译ncnn：跟上面的步骤雷同：
选择编译链，ncnn-master/toolchains/aarch64-linux-gnu.toolchain.cmake，点击configure，得到的变量，有两处要改：
1.ncnn_build_tools的沟要去掉
2.opencv_dir选择到opencv编译好的build
最后在点击configure和generate，最后编译make -j8,并且安装：make install DESTDIR=ncnn,得到install文件夹，里面包含include和ncnn.a文件。
编译自己的项目，同样的步骤：先写cmakelists：
cmake_minimum_required(VERSION 2.8)
project(FaceDetector)
add_definitions(-std=c++11)
add_definitions("-Wall")
add_definitions(-DUNICODE -D_UNICODE)
FIND_PACKAGE( OpenMP REQUIRED)
if(OPENMP_FOUND)
message("OPENMP FOUND")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
endif()
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/ncnn/include/ncnn)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
link_directories(${CMAKE_CURRENT_SOURCE_DIR}/ncnn/lib)
find_package( OpenCV REQUIRED )
if (NOT OpenCV_FOUND)
message(FATAL_ERROR "opencv Not Found!")
else()
message(STATUS "OpenCV_LIBS: ${OpenCV_LIBS}")
message(STATUS "OpenCV_INCLUDE_DIRS: ${OpenCV_INCLUDE_DIRS}")
include_directories(${OpenCV_INCLUDE_DIRS})
endif (NOT OpenCV_FOUND)
set(SRC_LIB
src/ocr.cpp
src/RRLib.cpp
)
add_library(text_recognition SHARED ${SRC_LIB} )
target_link_libraries(text_recognition ncnn ${OpenCV_LIBS} )
set(SRC src/main.cpp)
add_executable(Text_recognition ${SRC})
target_link_libraries(Text_recognition text_recognition ncnn ${OpenCV_LIBS})
首先需要从ncnn项目拷贝toolchain文件夹和install文件夹（install重新命名为ncnn）到自己项目的根目录，然后打开cmake-gui，步骤和上面一样，tooltrain，在拷贝的ncnn tooltrain文件夹里面找，同时也要设置好opencv的build路径，最后就可以成功编译。 | 
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