andriod 编译ocr demo时find_package(opencv require) 时出错

[hch-baobei]

D:\code\Paddle-Lite-Demo\ocr\android\app\cxx\ppocr_demo\app\src\main\cpp\CMakeLists.txt : C/C++ debug|arm64-v8a : CMake Error at D:\code\Paddle-Lite-Demo\ocr\android\app\cxx\ppocr_demo\app\src\main\cpp\CMakeLists.txt:16 (find_package):
By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "OpenCV", but
CMake did not find one.

Could not find a package configuration file provided by "OpenCV" with any
of the following names:

OpenCVConfig.cmake
opencv-config.cmake

Add the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH or set
"OpenCV_DIR" to a directory containing one of the above files. If "OpenCV"
provides a separate development package or SDK, be sure it has been
installed.

我应该怎么做？