Android NDK交叉编译openCV
2021-10-20 本文已影响0人
招金
下载openCV
- 下载wget https://github.com/opencv/opencv/archive/3.4.6.tar.gz
- 解压openCV tar -xvf 3.4.6.tar.gz
下载NDK交叉编译链
注意android-ndk-r16b-linux-x86_64.zip编译测试程序时候会link出错，建议用r18b
- 下载链接android-ndk-r18b-linux-x86_64.zip
- 解压unzip android-ndk-r18b-linux-x86_64.zip
下载android SDK
- 下载wget http://dl.google.com/android/android-sdk_r24.4.1-linux.tgz
- 解压tar -xvf android-sdk_r24.4.1-linux.tgz
- 更新sdk tools/android update sdk --no-ui
把脚本build.sh放入openCV根目录
#!/bin/bash
NDK_ROOT="/home/kaober/disk4T1/raojun3/android-ndk-r18b"
SDK_ROOT="/home/kaober/disk4T1/raojun3/android-sdk-linux"
### ABIs setup
ANDROID_ABI_LIST=("arm64-v8a" "armeabi-v7a")
### path setup
SCRIPT=$(readlink -f $0)
WD=`dirname $SCRIPT`
OPENCV_ROOT="${WD}"
N_JOBS=48
INSTALL_DIR="${WD}/build"
rm -rf "${INSTALL_DIR}"
### Make each ABI target iteratly and sequentially
for i in "${ANDROID_ABI_LIST[@]}"
do
ANDROID_ABI="${i}"
echo "Start building ${ANDROID_ABI} version"
if [ "${ANDROID_ABI}" = "armeabi" ]; then
API_LEVEL=19
else
API_LEVEL=24
fi
temp_build_dir="${OPENCV_ROOT}/platforms/build_android_${ANDROID_ABI}"
### Remove the build folder first, and create it
rm -rf "${temp_build_dir}"
mkdir -p "${temp_build_dir}"
cd "${temp_build_dir}"
echo ${INSTALL_DIR}
cmake \
-DCMAKE_MAKE_PROGRAM=/usr/bin/make \
-DCMAKE_BUILD_WITH_INSTALL_RPATH=ON \
-DCMAKE_TOOLCHAIN_FILE=${NDK_ROOT}/build/cmake/android.toolchain.cmake \
-DANDROID_ABI=${ANDROID_ABI} \
-DANDROID_STL=c++_shared \
-DCMAKE_BUILD_TYPE=Release \
-DANDROID_NATIVE_API_LEVEL=${API_LEVEL} \
-DCMAKE_BUILD_TYPE=Release \
-DWITH_FFMPEG=ON \
-D BUILD_opencv_java=ON \
-D BUILD_ANDROID_PROJECTS=ON \
-D WITH_CUDA=OFF \
-D WITH_MATLAB=OFF \
-D BUILD_ANDROID_EXAMPLES=OFF \
-D BUILD_DOCS=OFF \
-D BUILD_PERF_TESTS=OFF \
-D BUILD_TESTS=OFF \
-DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
-DANDROID_SDK=${SDK_ROOT} \
../..
# Build it
make -j${N_JOBS}
# Install it
make install/strip
### Remove temp build folder
cd "${WD}"
rm -rf "${temp_build_dir}"
echo "end building ${ANDROID_ABI} version"
done
运行build.sh
build下就生成我们需要的OpenCV sdk。
验证SDK
编写测试cpp
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#define CV_CXX_STD_ARRAY 0
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp" //OpenCV 图像处理头文件
using namespace cv; // 包含 cv 命名空间
using namespace std;
int main()
{
// 读取图片
Mat src = imread("/sdcard/1.jpg", 1);
Mat dst;
// 彩色转为灰度图片
cvtColor(src,dst,CV_BGR2GRAY);
imwrite("/sdcard/2.jpg",dst);
src.release();
dst.release();
return 0;
}
构建CMakeLists.txt
cmake_minimum_required(VERSION 2.8.3)
project(main_arm)
add_definitions("-Wall -g")
set(OpenCVHome /home/kaober/disk4T1/raojun3/opencv-3.4.6/build/sdk/native)
include_directories(${OpenCVHome}/jni/include)
link_directories(${OpenCVHome}/staticlibs/armeabi-v7a
${OpenCVHome}/3rdparty/libs/armeabi-v7a)
link_libraries(
opencv_imgcodecs
opencv_imgproc
opencv_highgui
opencv_core
opencv_video
opencv_features2d
opencv_videoio
cpufeatures
tegra_hal
IlmImf
libjasper
libjpeg-turbo
libpng
libprotobuf
libtiff
libwebp
# quirc
log
z
)
add_executable(${PROJECT_NAME} main.cpp)
install(TARGETS ${PROJECT_NAME}
RUNTIME DESTINATION ${PROJECT_SOURCE_DIR})
编译build.sh
#/bin/bash
export ANDROID_NDK=/home/kaober/disk4T1/raojun3/android-ndk-r18b
rm -r build
mkdir build && cd build
cmake -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK/build/cmake/android.toolchain.cmake \
-DANDROID_ABI="armeabi-v7a" \
-DANDROID_NDK=$ANDROID_NDK \
-DANDROID_PLATFORM=android-26 \
..
make && make install
cd ..
运行build.sh
1634720693(1).png
编译完成
验证
- push main_arm到android运行
-
运行main-arm
之前img
1.jpg
run之后img
2.jpg
验证成功
如果需要验证libopencv_java3.so动态库
用如下CMakeLists.txt编译运行程序
cmake_minimum_required(VERSION 2.8.3)
project(main_arm)
add_definitions("-Wall -g")
set(OpenCVHome /home/kaober/disk4T1/raojun3/opencv-3.4.6/build/sdk/native)
include_directories(${OpenCVHome}/jni/include)
link_directories(${OpenCVHome}/libs/armeabi-v7a
${OpenCVHome}/3rdparty/libs/armeabi-v7a)
link_libraries(
c++_static
opencv_java3
log
z
)
add_executable(${PROJECT_NAME} main.cpp)
install(TARGETS ${PROJECT_NAME}
RUNTIME DESTINATION ${PROJECT_SOURCE_DIR})
- push libopencv_java3.so /system/lib/
- push main_arm /system/bin/
- 运行main_arm
