如何在 Qt 中 use/link OpenCV 3.4.1 for Android？

Question

我想在我的 Qt 中为 Android 项目使用 OpenCV 3.4.1，但是我遇到构建错误，例如：

.../libopencv_core.a(system.cpp.o):system.cpp:function cv::HWFeatures::initialize(): error: undefined reference to 'android_getCpuFeatures'
.../libopencv_core.a(arithm.cpp.o):arithm.cpp:function cv::hal::cmp8u(unsigned char const*, unsigned int, unsigned char const*, unsigned int, unsigned char*, unsigned int, int, int, void*): error: undefined reference to 'carotene_o4t::isSupportedConfiguration()'
.../libopencv_core.a(arithm.cpp.o):arithm.cpp:function cv::hal::cmp8u(unsigned char const*, unsigned int, unsigned char const*, unsigned int, unsigned char*, unsigned int, int, int, void*): error: undefined reference to 'carotene_o4t::cmpGE(carotene_o4t::Size2D const&, unsigned char const*, int, unsigned char const*, int, unsigned char*, int)'

Full error file here （对于 Stack Overflow 来说太大了）

这是我在我的 *.pro 文件中写的：

QT += core quick quickcontrols2 widgets
CONFIG += c++11 console

#...

OPENCVSDKNATIVE = $$PWD/3rdparty/opencv-3.4.1-android-sdk/sdk/native

INCLUDEPATH += $$OPENCVSDKNATIVE/jni/include

equals(ANDROID_TARGET_ARCH, armeabi-v7a) {
    message("setting armeabi-v7a OPENCV libs")

    # OPENCV LIBS
    LIBS += -L"$$OPENCVSDKNATIVE/3rdparty/libs/armeabi-v7a" -llibtiff -llibjpeg -llibjasper -llibpng -llibwebp -lIlmImf -ltbb -ltegra_hal
    LIBS += -L"$$OPENCVSDKNATIVE/staticlibs/armeabi-v7a" -lopencv_core -lopencv_imgcodecs -lopencv_imgproc

    ANDROID_EXTRA_LIBS += $$OPENCVSDKNATIVE/libs/armeabi-v7a/libopencv_java3.so
}

以及我在 cpp 代码中输入的内容：

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/imgcodecs/imgcodecs.hpp>

int main (int argc, char *argv[]){
    QString imgPath = "path_to_my_image.jpg";     
    cv::Mat image = cv::imread(imgPath.toStdString().c_str());
    //...
}

如何 use/link Qt 中的 OpenCV 3.4.1 for Android ?

使用的版本：

用于 Android 3.4.1 的 OpenCV SDK 来自 here.
Qt 5.10.1
Qt Creator 4.6.1
Android for armeabi-v7a（GCC 4.9，Qt 5.10.1 for Android armv72）发布

编辑 1：我更新了 *.pro 文件中的 LIBS var，但仍然有问题

LIBS +=\
    -L"$$OPENCVSDKNATIVE/3rdparty/libs/armeabi-v7a"\
    -L"$$OPENCVSDKNATIVE/staticlibs/armeabi-v7a"\
    -llibtiff -llibjpeg -llibjasper -llibpng -lIlmImf   -llibprotobuf\
    -lopencv_core -lopencv_imgproc -lopencv_imgcodecs\
    -ltbb -lcpufeatures -ltegra_hal

Answer 1

出现问题是因为 *.pro 文件中 LIBS var 的定义错误。

这是一个有效的（我添加了 -lcpufeatures 并将库整理得井井有条）

    LIBS +=\
    -L"$$OPENCVSDKNATIVE/3rdparty/libs/armeabi-v7a"\
    -L"$$OPENCVSDKNATIVE/staticlibs/armeabi-v7a"\
     -lopencv_imgcodecs -lopencv_imgproc -lopencv_core -llibtiff -llibjpeg -llibjasper -llibpng -lIlmImf -llibprotobuf -llibwebp -ltbb -lcpufeatures -ltegra_hal

如何在 Qt 中 use/link OpenCV 3.4.1 for Android？

How to use/link OpenCV 3.4.1 in Qt for Android?

qt

android

opencv

qmake