A simple app to use OpenCV 4.5 in Android Studio Bumblebee

This repository has only educational and teaching purposes.

Description

This repository contains an example of an Android Studio app (for Android) showing how to use OpenCV 4.5 to perform a simple binarization in HSV Color Space.

Getting Started

Dependencies

• OpenCV 4.5 for Android
• Android Studio Bumblebee (2021.1.1) Stable

Installing

• Download Android Studio Bumblebee (2021.1.1) Stable and uncompress in any location
• Download OpenCV 4.5 for Android and uncompress in any location
• Download this repository

Executing program

• Update references to OpenCV 4.5. for Android libraries, according to your local paths
• Import the project into Android Studio and Run
• Add your own function according to your needs, following this format:

extern "C" JNIEXPORT void JNICALL
Java_giiata_vision_opencvhelade_MainActivity_filters(
        JNIEnv* env,
        jobject /* this */,
        jobject bitmapIn,
        jobject bitmapOut,
        jint hMin,
        jint sMin,
        jint vMin,
        jint hMax,
        jint sMax,
        jint vMax) {


    cv::Mat src;
    bitmapToMat(env, bitmapIn, src, false);
    //cv::flip(src, src, 0);
    cv::Mat tmp;
    cv::cvtColor(src, tmp, cv::COLOR_BGR2HSV);
    cv::inRange(tmp, cv::Scalar(hMin, sMin, vMin), cv::Scalar(hMax, sMax, vMax), tmp);

    matToBitmap(env, tmp, bitmapOut, false);
}

Sample video

Video-Sample-OpenCV-4.2-Android-Studio-Bumblebee.webm

Authors

Contributors names and contact info

Vladimir Robles-Bykbaev @vlarobbyk

Version History

• 0.1
  • Initial Release

License

This project is licensed under The GNU General Public License v3.0 License - see the LICENSE.md file for details

Acknowledgments

Inspiration:

• Joe Wong
• The Coding Notebook