1.安装交叉编译工具gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu。

2.解压opencv库，在目录中新建build

3.进入build目录，打开终端，输入命令：

cmake ../  -D CMAKE_C_COMPILER=/home/KAS-300/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc -D CMAKE_CXX_COMPILER=/home/KAS-300/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-g++  -D CMAKE_AR=/home/KAS-300/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-ar -D CMAKE_TOOLCHAIN_FILE=/media/KAS-300/dd1/opencv-4.5.2/platforms/linux/aarch64-gnu.toolchain.cmake -DBUILD_opencv_core=ON -DBUILD_opencv_imgcodecs=ON -DBUILD_opencv_highgui=ON

其中，只编译部分模块，使用参数-DBUILD_opencv_core=ON

设置交叉编译链-D CMAKE_TOOLCHAIN_FILE=/media/KAS-300/dd1/opencv-4.5.2/platforms/linux/aarch64-gnu.toolchain.cmake

设置交叉编译器CMAKE_C_COMPILER=/home/KAS-300/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc -D CMAKE_CXX_COMPILER=/home/KAS-300/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-g++  -D CMAKE_AR=/home/KAS-300/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-ar

5.使用make;make install