OCVDecoder (Aka YAQD)

I started this project because i don't find a QR decoder that working well on iOS and Android using Qt6 and Felgo. I decided to use a decoder from OpenCV contrib (opencv_contrib) precesely wechat_qrcode. In the main branch it's possible already find the library compiled, don't worry no virus, no back door. If you want compile by yourself, feel free following the instructions.

Build

Prepare the code

1. clone the opencv mobile from opencv-mobile

   wget -q https://github.com/opencv/opencv/archive/4.8.0.zip -O opencv-4.8.0.zip unzip -q opencv-4.8.0.zip cd opencv-4.8.0 git clone https://github.com/opencv/opencv_contrib.git

   patch -p1 -i ../opencv-4.8.0-no-zlib.patch truncate -s 0 cmake/OpenCVFindLibsGrfmt.cmake rm -rf modules/gapi rm -rf modules/highgui cp -r ../highgui modules/

   patch -p1 -i ../opencv-4.8.0-no-rtti.patch

2. Overwrite the opencv4_cmake_options.txt with which you find in this project

Build

iOS

In the opencv directory:

1. mkdir build-ios
2. cd build-ios
3. cmake -DPLATFORM="OS" -DARCHS="arm64" \ -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules \ -DDEPLOYMENT_TARGET=$IOS_DEPLOYMENT_TARGET -DENABLE_BITCODE=$ENABLE_BITCODE \ -DENABLE_ARC=$ENABLE_ARC -DENABLE_VISIBILITY=$ENABLE_VISIBILITY \ -DCMAKE_C_FLAGS="-frtti" -DCMAKE_CXX_FLAGS="-frtti " \ -DCMAKE_INSTALL_PREFIX=install -DCMAKE_BUILD_TYPE=Release cat ../../opencv4_cmake_options.txt -DCMAKE_TOOLCHAIN_FILE=../../toolchains/ios.toolchain.cmake -DOPENCV_DISABLE_FILESYSTEM_SUPPORT=ON ..

Android

Set ANDROID_NDK_LATEST_HOME to the path of you Andoid NDK installation, then

1. mkdir build-android
2. cd build-android
3. cmake -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK_LATEST_HOME/build/cmake/android.toolchain.cmake\ -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules \ -DANDROID_USE_LEGACY_TOOLCHAIN_FILE=False -DANDROID_ABI="arm64-v8a" \ -DANDROID_PLATFORM=android-24 -DANDROID_CPP_FEATURES="rtti no-exceptions" \ -DCMAKE_INSTALL_PREFIX=install -DCMAKE_BUILD_TYPE=Release cat ../../opencv4_cmake_options.txt\ -DBUILD_opencv_world=OFF -DOPENCV_DISABLE_FILESYSTEM_SUPPORT=ON \ -DOPENCV_EXTRA_FLAGS="-mno-outline-atomics" ..

Installation

Thus copy the libraries in the correct path (see in the CMakeList.txt). Don't forget to copy the library from the 3rdyparty directory.

Use

1. Copy the ocvdecoder in your Qt project
2. Add this line add_subdirectory(ocvdecoder ${CMAKE_BINARY_DIR}/ocvdecoder) to the CMakeList.txt
3. Add the library ocvdecoder to the target_link_libraries
4. use import ocvdecoder in your Qml file
5. Only for Android add this cmake options ANDROID_PLATFORM=android-24

In the example directory there is an example created with Felgo but with pure Qt it's the same.

This project is working in progress, but stable to be used in project to decode Qr code like