System information (version)
OpenCV => 3.4.4
Platform => ARM (armeabiv7-a)
Android API Level => 24
Compiler => Clang 5.0
Android STL => gnustl_shared
NDK VERSION => NDK 15c
TOOLCHAIN USED => Opencv 3.4.4 toolchain android.
Goal of my request
Opti => NEON for Opencv (armeabiv7-a with NEON)
Introduction
My project, will use many things with Opencv, in Window we can't see a latency, however in Android we can see them.
After reading a lot of articles/forums/channels about Opencv with Android, I've seen that Opencv needed NEON on Android, ARM to do something well and without latency and run with optimizations
Configure / Make Shared Lib
So, to date, I have downloaded sources of opencv 3.4.4 from the official website, I have run it into my CMAKE-GUI, I've made a lot of correction to make a build successfully, but I would note that I haven't disable the essential modules from opencv like (core or any others).
(If it's necessary I can host my output of cmake here.)
Then after configure and make it, I have my shared library which will be linked into my Android studio project with cmakelists and other things..
After sync correct, I have made my project.
Errors occurred with Android Studio compile the project
So, I have encountered a few undefined symbols with opencv only.
We can see them :
error: undefined reference to 'cv::read(cv::FileNode const&, std::__ndk1::vector<cv::KeyPoint, std::__ndk1::allocator<cv::KeyPoint> >&)'
error: undefined reference to 'cv::write(cv::FileStorage&, cv::String const&, std::__ndk1::vector<cv::KeyPoint, std::__ndk1::allocator<cv::KeyPoint> > const&)'
error: undefined reference to 'cv::KeyPointsFilter::retainBest(std::__ndk1::vector<cv::KeyPoint, std::__ndk1::allocator<cv::KeyPoint> >&, int)'
error: undefined reference to 'cv::read(cv::FileNode const&, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >&, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&)'
error: undefined reference to 'cv::KeyPointsFilter::retainBest(std::__ndk1::vector<cv::KeyPoint, std::__ndk1::allocator<cv::KeyPoint> >&, int)'
error: undefined reference to 'cv::KeyPointsFilter::retainBest(std::__ndk1::vector<cv::KeyPoint, std::__ndk1::allocator<cv::KeyPoint> >&, int)'
error: undefined reference to 'cv::DescriptorMatcher::knnMatch(cv::_InputArray const&, cv::_InputArray const&, std::__ndk1::vector<std::__ndk1::vector<cv::DMatch, std::__ndk1::allocator<cv::DMatch> >, std::__ndk1::allocator<std::__ndk1::vector<cv::DMatch, std::__ndk1::allocator<cv::DMatch> > > >&, int, cv::_InputArray const&, bool) const'
error: undefined reference to 'cv::DescriptorMatcher::knnMatch(cv::_InputArray const&, cv::_InputArray const&, std::__ndk1::vector<std::__ndk1::vector<cv::DMatch, std::__ndk1::allocator<cv::DMatch> >, std::__ndk1::allocator<std::__ndk1::vector<cv::DMatch, std::__ndk1::allocator<cv::DMatch> > > >&, int, cv::_InputArray const&, bool) const'
error: undefined reference to 'cv::KeyPointsFilter::retainBest(std::__ndk1::vector<cv::KeyPoint, std::__ndk1::allocator<cv::KeyPoint> >&, int)'
error: undefined reference to 'cv::DescriptorMatcher::knnMatch(cv::_InputArray const&, cv::_InputArray const&, std::__ndk1::vector<std::__ndk1::vector<cv::DMatch, std::__ndk1::allocator<cv::DMatch> >, std::__ndk1::allocator<std::__ndk1::vector<cv::DMatch, std::__ndk1::allocator<cv::DMatch> > > >&, int, cv::_InputArray const&, bool) const'
error: undefined reference to 'cv::DescriptorMatcher::knnMatch(cv::_InputArray const&, cv::_InputArray const&, std::__ndk1::vector<std::__ndk1::vector<cv::DMatch, std::__ndk1::allocator<cv::DMatch> >, std::__ndk1::allocator<std::__ndk1::vector<cv::DMatch, std::__ndk1::allocator<cv::DMatch> > > >&, int, cv::_InputArray const&, bool) const'
error: undefined reference to 'cv::drawKeypoints(cv::_InputArray const&, std::__ndk1::vector<cv::KeyPoint, std::__ndk1::allocator<cv::KeyPoint> > const&, cv::_InputOutputArray const&, cv::Scalar_<double> const&, int)'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
I don't know what are she's doing, but I want these optimizations and I will be very grateful if you have some things to tell me.
Best Regards !!
EDIT :
I've test another config :
cmake -G "Unix Makefiles"
-DCMAKE_BUILD_WITH_INSTALL_RPATH=ON
-DTBB=ON
-DWITH_NEON=ON
-DWITH_EIGEN=ON
-DWITH_OPENCL=ON
-DBUILD_opencv_gpu=OFF
-DCMAKE_TOOLCHAIN_FILE=/home/Documents/opencv-3.4.4/platforms/android/android.toolchain.cmake
-DCMAKE_MAKE_PROGRAM=/home/Android/Sdk/ndk-bundle/prebuilt/linux-x86_64/bin/make
-DANDROID_ABI="armeabi-v7a with NEON"
-DOPENCV_EXTRA_MODULES_PATH=/home/Documents/opencv_contrib-3.4.4/modules/
-DBUILD_opencv_features2d=ON
-DBUILD_opencv_ximgproc=ON
-DBUILD_opencv_java=OFF
-DCMAKE_BUILD_TYPE=RELEASE
-DCXXFLAGS="-Wall -fpu=neon -O3"
-DBUILD_JAVA=OFF
-DBUILD_ANDROID_EXAMPLES=OFF
-DEIGEN_INCLUDE_PATH=/home/deps/Eigen_3.3.4/include/eigen3/
-DANDROID_NATIVE_API_LEVEL=24
-DCMAKE_ANDROID_API_MIN=24
-DANDROID_NDK=/home/Android/Sdk/ndk-bundle/
-DBUILD_SHARED_LIBS=ON
-DBUILD_DOCS=OFF
-DANDROID_STL=gnustl_static
..
CMake Warning at cmake/OpenCVUtils.cmake:611 (message):
Unexpected option: WITH_EIGEN (=ON)
Condition: IF ((;NOT;WINRT;AND;NOT;CMAKE_CROSSCOMPILING;))
Call Stack (most recent call first):
CMakeLists.txt:233 (OCV_OPTION)
-- Looking for ccache - not found
-- OpenCV disables pkg-config to avoid using of host libraries. Consider using PKG_CONFIG_LIBDIR to specify target SYSROOT
-- libjpeg-turbo: VERSION = 1.5.3, BUILD = opencv-3.4.4-libjpeg-turbo
-- Caffe: NO
-- Protobuf: NO
-- Glog: NO
-- freetype2: NO
-- harfbuzz: NO
-- Module opencv_ovis disabled because OGRE3D was not found
-- No preference for use of exported gflags CMake configuration set, and no hints for include/library directories provided. Defaulting to preferring an installed/exported gflags CMake configuration if available.
-- Failed to find installed gflags CMake configuration, searching for gflags build directories exported with CMake.
-- Failed to find gflags - Failed to find an installed/exported CMake configuration for gflags, will perform search for installed gflags components.
-- Failed to find gflags - Could not find gflags include directory, set GFLAGS_INCLUDE_DIR to directory containing gflags/gflags.h
-- Failed to find glog - Could not find glog include directory, set GLOG_INCLUDE_DIR to directory containing glog/logging.h
-- Module opencv_sfm disabled because the following dependencies are not found: Glog/Gflags
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse2.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse3.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.ssse3.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse4_1.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse4_2.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.avx.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.fp16.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.avx2.cpp
-- Excluding from source files list: <BUILD>/modules/core/test/test_intrin256.avx2.cpp
-- Excluding from source files list: modules/imgproc/src/corner.avx.cpp
-- Excluding from source files list: modules/imgproc/src/filter.avx2.cpp
-- Excluding from source files list: modules/imgproc/src/imgwarp.avx2.cpp
-- Excluding from source files list: modules/imgproc/src/imgwarp.sse4_1.cpp
-- Excluding from source files list: modules/imgproc/src/resize.avx2.cpp
-- Excluding from source files list: modules/imgproc/src/resize.sse4_1.cpp
-- Excluding from source files list: modules/imgproc/src/undistort.avx2.cpp
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx.cpp
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx2.cpp
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx512_skx.cpp
-- Excluding from source files list: modules/features2d/src/fast.avx2.cpp
-- Excluding from source files list: modules/objdetect/src/haar.avx.cpp
--
-- General configuration for OpenCV 3.4.4 =====================================
-- Version control: unknown
--
-- Extra modules:
-- Location (extra): /home/Documents/opencv_contrib-3.4.4/modules
-- Version control (extra): unknown
--
-- Platform:
-- Timestamp: 2018-11-28T08:29:40Z
-- Host: Linux 4.15.0-39-generic x86_64
-- Target: Android 1 armv7-a
-- CMake: 3.11.4
-- CMake generator: Unix Makefiles
-- CMake build tool: /home/Android/Sdk/ndk-bundle/prebuilt/linux-x86_64/bin/make
-- Configuration: RELEASE
--
-- CPU/HW features:
-- Baseline: NEON
-- requested: DETECT
-- required: NEON
-- disabled: VFPV3
--
-- C/C++:
-- Built as dynamic libs?: YES
-- C++ Compiler: /home/Android/Sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ (ver 4.9.0)
-- C++ flags (Release): -fexceptions -frtti -Wno-psabi --sysroot=/home/Android/Sdk/ndk-bundle/platforms/android-24/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=neon -fdata-sections -ffunction-sections -Wa,--noexecstack -DANDROID -D__ANDROID_API__=24 -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wno-missing-field-initializers -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -mfp16-format=ieee -fvisibility=hidden -fvisibility-inlines-hidden -mthumb -fomit-frame-pointer -fno-strict-aliasing -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fexceptions -frtti -Wno-psabi --sysroot=/home/Android/Sdk/ndk-bundle/platforms/android-24/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=neon -fdata-sections -ffunction-sections -Wa,--noexecstack -DANDROID -D__ANDROID_API__=24 -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wno-missing-field-initializers -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -mfp16-format=ieee -fvisibility=hidden -fvisibility-inlines-hidden -marm -fno-omit-frame-pointer -fno-strict-aliasing -O0 -g -DDEBUG -D_DEBUG -DDEBUG -D_DEBUG
-- C Compiler: /home/Android/Sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc
-- C flags (Release): -fexceptions -Wno-psabi --sysroot=/home/Android/Sdk/ndk-bundle/platforms/android-24/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=neon -fdata-sections -ffunction-sections -Wa,--noexecstack -DANDROID -D__ANDROID_API__=24 -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wno-missing-field-initializers -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -mfp16-format=ieee -fvisibility=hidden -mthumb -fomit-frame-pointer -fno-strict-aliasing -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fexceptions -Wno-psabi --sysroot=/home/Android/Sdk/ndk-bundle/platforms/android-24/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=neon -fdata-sections -ffunction-sections -Wa,--noexecstack -DANDROID -D__ANDROID_API__=24 -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wno-missing-field-initializers -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -mfp16-format=ieee -fvisibility=hidden -marm -fno-omit-frame-pointer -fno-strict-aliasing -O0 -g -DDEBUG -D_DEBUG -DDEBUG -D_DEBUG
-- Linker flags (Release): -Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,-allow-shlib-undefined -Wl,--gc-sections -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now
-- Linker flags (Debug): -Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,-allow-shlib-undefined -Wl,--gc-sections -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now
-- ccache: NO
-- Precompiled headers: NO
-- Extra dependencies: dl m log
-- 3rdparty dependencies:
--
-- OpenCV modules:
-- To be built: aruco bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dpm face features2d flann fuzzy hfs highgui img_hash imgcodecs imgproc java_bindings_generator line_descriptor ml objdetect optflow phase_unwrapping photo plot reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab xfeatures2d ximgproc xobjdetect xphoto
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: cnn_3dobj cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv freetype hdf java js matlab ovis python2 python3 sfm viz
-- Applications: tests perf_tests
-- Documentation: NO
-- Non-free algorithms: NO
--
-- Android NDK: location: /home/Android/Sdk/ndk-bundle
-- Android ABI: armeabi-v7a with NEON
-- NDK toolchain: arm-linux-androideabi-4.9
-- STL type: gnustl_static
-- Native API level: 24
-- Android SDK: (tools: build tools: )
--
-- GUI:
--
-- Media I/O:
-- ZLib: z (ver 1.2.3)
-- JPEG: build-libjpeg-turbo (ver 1.5.3-62)
-- WEBP: build (ver encoder: 0x020e)
-- PNG: build (ver 1.6.35)
-- TIFF: build (ver 42 - 4.0.9)
-- JPEG 2000: build (ver 1.900.1)
-- OpenEXR: build (ver 1.7.1)
-- HDR: YES
-- SUNRASTER: YES
-- PXM: YES
--
-- Video I/O:
--
-- Parallel framework: pthreads
--
-- Trace: YES (built-in)
--
-- Other third-party libraries:
-- Eigen: YES (ver 3.3.4)
-- Custom HAL: YES (carotene (ver 0.0.1))
-- Protobuf: build (3.5.1)
--
-- OpenCL: YES (no extra features)
-- Include path: /home/Documents/opencv-3.4.4/3rdparty/include/opencl/1.2
-- Link libraries: Dynamic load
--
-- Python (for build): /usr/bin/python2.7
--
-- Install to: /home/Documents/opencv-3.4.4/build_01/install
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
-- Build files have been written to: /home/Documents/opencv-3.4.4/build_01
But nothing happened.. someone found something ?
