Native OpenCV in Android Studio with face detect

This application is a sample of the OpenCV in Android. In the sample we use the OpenCV SDK to detect faces.

The application has been tested with:

• Android Compile SDK '28'
• Android Build Tools '28.0.3'
• Gradle '3.4.2'
• OpenCV SDK '3.4.3'

Configuration / Usage:

Here is how to use this project to run native OpenCV code.

• Make sure you have Android SDK up to date, with NDK installed
• Download OpenCV SDK 3.4.3 for Android from OpenCV.org and decompress the zip file.
• Clone this project
• Create a symlink named jniLibs in app/src/main that points to ${YOUR_HOME_OPENCV_SDK}/sdk/native/libs
• In app/CMakeLists.txt change line 9 to points to ${YOUR_HOME_OPENCV_SDK}/sdk/native/jni/include
• Sync gradle
• Run the application

Notes:

• The openCVLibaray343 library inside the project contains the java code of /openCVLibrary343/src/main/java, copied from the ${YOUR_HOME_OPENCV_SDK}/sdk/java/src folder.

• The aidl folder /openCVLibrary343/src/main/aidl contains the contents of ${YOUR_HOME_OPENCV_SDK}/sdk/java/src/org/opencv/engine folder, keeping the same package.

• For detection we are using a Haar Cascade frontal face detection inserted in res/raw/haarcascade_frontalface_alt.xml ( We can find other Haar at: GitHub Link )

Sample App Image

References

• https://github.com/leadrien/opencv_native_androidstudio