Unable to include opencv in visp build

[saiakash]

hi, i want to integrate visp with opencv for advanced task for Android studio. so i installed opencv and visp using this tutrial: https://visp-doc.inria.fr/doxygen/visp-daily/tutorial-install-win11-msvc17.html#install_win11_msvc17_advanced .
But, when i run sdk build using the command
python3 [build_sdk.py](http://build_sdk.py/) --config [ndk-23.config.py](http://ndk-23.config.py/) --sdk_path c:\Users\TD02\AppData\Local\Android\Sdk --ndk_path C:\Users\TD02\AppData\Local\Android\Sdk\ndk-bundle c:\Users\TD02\visp-ws\visp-build-android-sdk c:\Users\TD02\visp-ws\visp --debug
visp unable to find opencv .
visp build without opencv setup.
Can you anyone guide me to include opencv in visp.

Below is my log file:

sdkbuild.log

-- ANDROID_PLATFORM not set. Defaulting to minimum supported version
16.
-- The C compiler identification is Clang 11.0.5
-- The CXX compiler identification is Clang 11.0.5
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Users/TD02/AppData/Local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Users/TD02/AppData/Local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang++.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done

-- ==========================================================
-- General configuration information for ViSP 3.6.1
-- 
--   Version control:               unknown
-- 
--   Platform:
--     Timestamp:                   2024-03-22T05:57:01Z
--     Host:                        Windows 10.0.22621 AMD64
--     Target:                      Android 1 aarch64
--     CMake:                       3.28.1
--     CMake generator:             Ninja
--     CMake build tool:            C:/Users/TD02/Downloads/ninja-win/ninja.exe
--     Configuration:               Debug
-- 
--   System information:
--     Number of CPU logical cores: 12
--     Number of CPU physical cores: 6
--     Total physical memory (in MiB): 16110
--     OS name:                     Windows
--     OS release:                  Personal
--     OS version:                  (Build 22621)
--     OS platform:                 AMD64
--     CPU name:                    Unknown P6 family
--     Is the CPU 64-bit?           yes
--     Does the CPU have FPU?       yes
--     CPU optimization:            NEON
-- 
--   C/C++:
--     Built as dynamic libs?:      no
--     C++ Compiler:                C:/Users/TD02/AppData/Local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang++.exe  (ver 11.0.5)
--     C++ flags (Release):         -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security    -Wall -Wextra -fopenmp=libomp -pthread -std=c++17 -fvisibility=hidden -fPIC -O2 -DNDEBUG 
--     C++ flags (Debug):           -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security    -Wall -Wextra -fopenmp=libomp -pthread -std=c++17 -fvisibility=hidden -fPIC -O0 -fno-limit-debug-info 
--     C Compiler:                  C:/Users/TD02/AppData/Local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe
--     C flags (Release):           -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security   -Wall -Wextra -fopenmp=libomp -pthread -std=c++17 -fvisibility=hidden -fPIC -O2 -DNDEBUG 
--     C flags (Debug):             -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security   -Wall -Wextra -fopenmp=libomp -pthread -std=c++17 -fvisibility=hidden -fPIC -O0 -fno-limit-debug-info 
--     Linker flags (Release):      -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libgcc_real.a -Wl,--exclude-libs,libatomic.a -Wl,--build-id=sha1 -Wl,--no-rosegment -Wl,--fatal-warnings -Wl,--no-undefined -Qunused-arguments 
--     Linker flags (Debug):        -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libgcc_real.a -Wl,--exclude-libs,libatomic.a -Wl,--build-id=sha1 -Wl,--no-rosegment -Wl,--fatal-warnings -Wl,--no-undefined -Qunused-arguments 
--     Use cxx standard:            17
-- 
--   ViSP modules:
--     To be built:                 core gui imgproc io java_bindings_generator klt me sensor ar blob robot visual_features vs vision detection mbt tt tt_mi java
--     Disabled:                    -
--     Disabled by dependency:      -
--     Unavailable:                 -
-- 
--   Android NDK:                   C:/Users/TD02/AppData/Local/Android/Sdk/ndk-bundle (ver 22.1.7171670)
--     Android ABI:                 arm64-v8a
--     NDK toolchain:               aarch64-linux-android-clang
--     STL type:                    c++_shared
--     Native API level:            21
--   Android SDK:                   c:/Users/TD02/AppData/Local/Android/Sdk (tools: 26.1.1 build tools: 34.0.0)
-- 
--   Python 3:
--     Interpreter:                 C:/Users/TD02/AppData/Local/Microsoft/WindowsApps/python.exe (ver 3.11.8)
-- 
--   Java:                          export all functions
--     ant:                         no
-- 
--   Python3 bindings:              no
-- 
--   Build options: 
--     Build deprecated:            yes
--     Build with moment combine:   no
-- 
--   OpenCV: 
--     Version:                     n/a
-- 
--   Mathematics: 
--     Blas/Lapack:                 yes
--     \- Use MKL:                  no
--     \- Use OpenBLAS:             no
--     \- Use Atlas:                no
--     \- Use Netlib:               no
--     \- Use GSL:                  no
--     \- Use Lapack (built-in):    yes (ver 3.2.1)
--     Use Eigen3:                  no
--     Use OpenCV:                  no
-- 
--   Simulator: 
--     Ogre simulator: 
--     \- Use Ogre3D:               no
--     \- Use OIS:                  no
--     Coin simulator: 
--     \- Use Coin3D:               no
--     \- Use SoWin:                no
--     \- Use SoXt:                 no
--     \- Use SoQt:                 no
--     \- Use Qt5:                  no
--     \- Use Qt4:                  no
--     \- Use Qt3:                  no
-- 
--   Media I/O: 
--     Use JPEG:                    no
--     Use PNG:                     no
--     \- Use ZLIB:                 yes (ver 1.2.11)
--     Use OpenCV:                  no
--     Use stb_image (built-in):    yes (ver 2.27.0)
--     Use TinyEXR (built-in):      yes (ver 1.0.2)
--     Use simdlib (built-in):      yes
-- 
--   Real robots: 
--     Use Afma4:                   no
--     Use Afma6:                   no
--     Use Franka:                  no
--     Use Viper650:                no
--     Use Viper850:                no
--     Use ur_rtde:                 no
--     Use Kinova Jaco:             no
--     Use aria (Pioneer):          no
--     Use PTU46:                   no
--     Use Biclops PTU:             no
--     Use Flir PTU SDK:            no
--     Use MAVSDK:                  no
--     Use Parrot ARSDK:            no
--     \-Use ffmpeg:                no
--     Use Virtuose:                no
--     Use qbdevice (built-in):     yes (ver 2.6.0)
--     Use takktile2 (built-in):    no
--     Use pololu (built-in):       no
-- 
--   GUI: 
--     Use X11:                     no
--     Use GTK:                     no
--     Use OpenCV:                  no
--     Use GDI:                     no
--     Use Direct3D:                no
-- 
--   Cameras: 
--     Use DC1394-2.x:              no
--     Use CMU 1394:                no
--     Use V4L2:                    no
--     Use directshow:              no
--     Use OpenCV:                  no
--     Use FLIR Flycapture:         no
--     Use Basler Pylon:            no
--     Use IDS uEye:                no
-- 
--   RGB-D sensors: 
--     Use Realsense:               no
--     Use Realsense2:              no
--     Use Occipital Structure:     no
--     Use Kinect:                  no
--     \- Use libfreenect:          no
--     \- Use libusb-1:             no
--     \- Use std::thread:          yes
--     Use PCL:                     no
--     \- Use VTK:                  no
-- 
--   F/T sensors: 
--     Use atidaq (built-in):       no
--     Use comedi:                  no
--     Use IIT SDK:                 no
-- 
--   Mocap: 
--     Use Qualisys:                no
--     Use Vicon:                   no
-- 
--   Detection: 
--     Use zbar:                    no
--     Use dmtx:                    no
--     Use AprilTag (built-in):     yes (ver 3.1.1)
--     \- Use AprilTag big family:  no
-- 
--   Misc: 
--     Use Clipper (built-in):      no
--     Use pugixml (built-in):      yes (ver 1.9.0)
--     Use libxml2:                 no
--     Use json (nlohmann):         no
-- 
--   Optimization: 
--     Use OpenMP:                  yes
--     Use std::thread:             yes
--     Use pthread:                 no
--     Use pthread (built-in):      no
--     Use simdlib (built-in):      yes
-- 
--   DNN: 
--     Use CUDA Toolkit:            no
--     Use TensorRT:                no
-- 
--   Documentation: 
--     Use doxygen:                 no
--     \- Use mathjax:              no
-- 
--   Tests and samples:
--     Use catch2 (built-in):       yes (ver 2.13.7)
--     Tests:                       no
--     Apps:                        no
--     Demos:                       no
--     Examples:                    no
--     Tutorials:                   no
--     Dataset found:               no
-- 
--   Library dirs:
-- 
--   Install path:                  C:/Users/TD02/visp-ws/visp-build-android-sdk/o4a/install
-- 
-- ==========================================================
-- Configuring done (47.2s)
-- Generating done (0.2s)
-- Build files have been written to: C:/Users/TD02/visp-ws/visp-build-android-sdk/o4a


BUILD SUCCESSFUL in 14s

51 actionable tasks: 51 executed

Watched directory hierarchies: [C:\Users\TD02\visp-ws\visp-build-android-sdk\o4a\visp_android]

[10/11] Install the project...
Package configuration:
================================================================================
ABIs = [
#    ABI("2", "armeabi-v7a", None, cmake_vars=dict(ANDROID_ABI='armeabi-v7a with NEON', ANDROID_GRADLE_PLUGIN_VERSION='4.1.2', GRADLE_VERSION='7.0')),
    ABI("3", "arm64-v8a",   None, cmake_vars=dict(ANDROID_GRADLE_PLUGIN_VERSION='4.1.2', GRADLE_VERSION='7.0')),
 #  ABI("5", "x86_64",      None, cmake_vars=dict(ANDROID_GRADLE_PLUGIN_VERSION='4.1.2', GRADLE_VERSION='7.0')),
  #  ABI("4", "x86",         None, cmake_vars=dict(ANDROID_GRADLE_PLUGIN_VERSION='4.1.2', GRADLE_VERSION='7.0')),
]
================================================================================

[karthiTD]

https://visp-doc.inria.fr/doxygen/visp-daily/tutorial-create-android-sdk.html . i follow the link for install visp android sdk the build was succesfull but there is no opencv how to add it

[fspindle]

Never done. Did you first build OpenCV android sdk and then during ViSP configuration set OpenCV_DIR cmake var to its location ?

[saiakash]

To resolve an issue, I made adjustments in both the build_sdk.py and CMakelist.txt files.

In the build_sdk.py file, I incorporated additional CMake parameters within the build_library function. These parameters were essential for configuring the build process properly. The added parameters include:

 def build_library(self, abi, do_install):
        cmd = [self.cmake_path, "-GNinja"]
        cmake_vars = dict(
            CMAKE_TOOLCHAIN_FILE=self.get_toolchain_file(),
            BUILD_EXAMPLES="OFF",
            BUILD_TESTS="OFF",
            BUILD_TUTORIALS="OFF",
            BUILD_DEMOS="OFF",
            BUILD_ANDROID_EXAMPLES="ON",
            INSTALL_ANDROID_EXAMPLES="ON",
            OpenCV_DIR="C:\\Users\\TD02\\Downloads\\opencv-4.9.0-android-sdk\\OpenCV-android-sdk\\sdk\\native\\jni",
            USE_OPENCV="TRUE",
            OpenCV_FOUND="ON",
            OpenCV_VERSION="4.9.0"
        )

These parameters ensure that the correct OpenCV directory is referenced and that OpenCV is properly utilized in the build process.

Furthermore, I made adjustments to the logic in the CMakelist.txt file to ensure proper handling of OpenCV support for Android.

if(NOT CMAKE_TOOLCHAIN_FILE)
  # Find opencv2.framework for ios and naoqi
  VP_OPTION(USE_OPENCV      "MyOpenCV" QUIET "Include OpenCV support" "OpenCV_DIR;OpenCV_FOUND;OPENCV_FOUND" ON)
  message("Include OpenCV support --------------648---------------------${OpenCV_DIR} ${OpenCV_FOUND} ${OPENCV_FOUND}")
else()
  message("Include OpenCV support ------------------650-------else----------${USE_OPENCV}")
  VP_OPTION(USE_OPENCV      "OpenCV;MyOpenCV" QUIET "Include OpenCV support" "OpenCV_DIR;OpenCV_FOUND;OPENCV_FOUND" ON)
  message("Include OpenCV support ------------------652-------else----------${USE_OPENCV}")
endif()

Hopefully, these modifications prove beneficial to others facing similar challenges.