下载

下载指定版本的opencv-4.1.0和opencv_contrib-4.1.0的源码

下载的压缩包拷贝到linux服务器上，解压

安装cmake-gui

sudo apt-get install cmake-gui

运行cmake-gui

选择source code路径和build路径，点击Configure

选择交叉编译配置选项

配置c和c++的编译器

点击finish会进行初步的配置

进一步配置

配置build类型

配置安装路径

将opencv_contrib模块也编译进来

保险起见，添加交叉编译器的根目录

勾选BUILD_opencv_world

再次点击Configure，开始解问题吧 ( :

问题1 缺少boostdesc_bgm.i

cmake尝试下载该文件，但网络问题卡住

打开opencv_contrib-4.1.0\modules\xfeatures2d\CMakeLists.txt，注释掉下载的命令

该模块也会因此被disable，目前用不到，先关了吧

也可以自行下载对应的文件放到对应的位置，这里先不管了(是福不是祸，是祸躲不过 ( : )

问题2 缺少face_landmark_model.dat

打开opencv_contrib-4.1.0\modules\face\CMakeLists.txt，注释掉下载的命令

同样，影响暂时未知

再次点击Configure，Configuring done

点击Generate，Generating done

开始make

cd build_hisi
make -j8

问题1

在common.cc中增加宏定义#define HAVE_PTHREAD

问题2 类型转换错误

打开opencv-4.1.0\build_hisi\CMakeCache.txt，添加 -fpermissive 编译选项

问题3 缺少boostdesc_bgm.i

终究逃不掉，自己下载吧
打开\opencv_contrib-4.1.0\modules\xfeatures2d\cmake\download_boostdesc.cmake，参照里面的下载内容打开url，右键另存为文件。

同理打开\opencv_contrib-4.1.0\modules\xfeatures2d\cmake\download_vgg.cmake，下载所需内容
将这些下载的文件拷贝到opencv_contrib-4.1.0\modules\xfeatures2d\src下

问题4 undefined reference to “pthread_key_create”

打开opencv-4.1.0\build_hisi\CMakeCache.txt，CMAKE_EXE_LINKER_FLAGS添加 -lpthread -lrt -ldl 链接选项

问题5

打开\opencv-4.1.0\3rdparty\libpng\pngpriv.h，做如下替换

#  if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \

替换为

#if defined(PNG_ARM_NEON) && (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \

问题6

头文件include地址不对，features2d/test/test_detectors_regression.impl.hpp在opencv-4.1.0的opencv-4.1.0/modules/而不是opencv_contrib-4.1.0/modules/

将以下几个文件从opencv-4.1.0\modules\features2d\test目录拷贝到opencv_contrib-4.1.0\modules\xfeatures2d\test目录下

test_descriptors_invariance.impl.hpp
test_descriptors_regression.impl.hpp
test_detectors_invariance.impl.hpp
test_detectors_regression.impl.hpp
test_invariance_utils.hpp

打开\opencv_contrib-4.1.0\modules\xfeatures2d\test\test_features2d.cpp

#include "features2d/test/test_detectors_regression.impl.hpp"
#include "features2d/test/test_descriptors_regression.impl.hpp"

替换为

#include "test_detectors_regression.impl.hpp"
#include "test_descriptors_regression.impl.hpp"

打开\opencv_contrib-4.1.0\modules\xfeatures2d\test\test_rotation_and_scale_invariance.cpp

#include "features2d/test/test_detectors_invariance.impl.hpp" // main OpenCV repo
#include "features2d/test/test_descriptors_invariance.impl.hpp" // main OpenCV repo

替换为

#include "test_detectors_invariance.impl.hpp"
#include "test_descriptors_invariance.impl.hpp"

make install

make install

测试库

创建以下文件：

cvtColor.cpp

#include <opencv2/opencv.hpp>
using namespace cv;
int main(void){
    Mat img = imread("./dog.jpg");
    if (img.empty()){
        printf("reading image fails \n");
    }
    Mat gray;
    cvtColor(img, gray, COLOR_BGR2GRAY);
    imwrite("./dog_gray.png", gray);
    printf("cvtColor done\n");
    return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.0.0 FATAL_ERROR)
find_package(OpenCV REQUIRED opencv_world)
# SET(OpenCV_LIBS "/home/aaron-wu/opencv/arm-linux-hisi/lib/libopencv_world.so")
# SET(OpenCV_INCLUDE_DIRS "/home/aaron-wu/opencv/arm-linux-hisi/include/opencv4")

# skip rpath
# SET(CMAKE_SKIP_RPATH TRUE)
# SET(CMAKE_SKIP_BUILD_RPATH TRUE)
# SET(CMAKE_SKIP_INSTALL_RPATH TRUE)

# set rpath self
SET(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
SET(CMAKE_INSTALL_RPATH "/lib")

add_executable(demo cvtColor.cpp)
SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lpthread -lrt -ldl")
message(STATUS ${OpenCV_LIBS})
target_link_libraries(demo PUBLIC ${OpenCV_LIBS})
target_include_directories(demo PUBLIC ${OpenCV_INCLUDE_DIRS})

build&make

mkdir build
cd build
touch build.sh
# 编辑build.sh如下
sh build.sh

build.sh

cmake -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_C_COMPILER=aarch64-himix210-linux-gcc \
    -DCMAKE_CXX_COMPILER=aarch64-himix210-linux-g++ \
    -DOpenCV_DIR=/home/aaron-wu/opencv/arm-linux-hisi/lib/cmake/opencv4 \
    ..
make -j4