real_time_circle_detection_android's Introduction

Real Time Circle Detection and Tracking for Android

This repository focuses on real time circle detection with OpenCV on Android OS. Please contact if you need professional object detection & tracking & counting projects on Android devices with the super high accuracy!

What does this program do?

Gets the camera frames and turn each frame to gray.
Applies the Hough Circle Transform to the grayed image.
Turn each frame to RGB and display the detected circle in a window.

Theory

Hough Circle Transform was used for circle detection in this project. It works in a roughly analogous way to the Hough Line Transform.

The flow diagram of this application;

OnCameraFrame method which is located at MainActivity.java;

public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
        Mat input = inputFrame.gray();
        Mat circles = new Mat();
        Imgproc.blur(input, input, new Size(7, 7), new Point(2, 2));
        Imgproc.HoughCircles(input, circles, Imgproc.CV_HOUGH_GRADIENT, 2, 100, 100, 90, 0, 1000);

        Log.i(TAG, String.valueOf("size: " + circles.cols()) + ", " + String.valueOf(circles.rows()));

        if (circles.cols() > 0) {
            for (int x=0; x < Math.min(circles.cols(), 5); x++ ) {
                double circleVec[] = circles.get(0, x);

                if (circleVec == null) {
                    break;
                }

                Point center = new Point((int) circleVec[0], (int) circleVec[1]);
                int radius = (int) circleVec[2];

                Imgproc.circle(input, center, 3, new Scalar(255, 255, 255), 5);
                Imgproc.circle(input, center, radius, new Scalar(255, 255, 255), 2);
            }
        }

        circles.release();
        input.release();
        return inputFrame.rgba();
}

Project Demo

The demo video of this project is available on YouTube: https://www.youtube.com/watch?v=eWxtt1411Xs
The screenshots;

Installation

Dependencies:

Android Studio
OpenCV (version 3.1.0)

How to build and run this source?

Clone project by using Android Studio
Select and build module CircleDetection

Citation

If you use this code for your publications, please cite it as:

@ONLINE{vdtc,
    author = "Ahmet Özlü",
    title  = "Real Time Circle Detection and Tracking for Android OS",
    year   = "2017",
    url    = "https://github.com/ahmetozlu/real_time_circle_detection_android"
}

Author

Ahmet Özlü

License

This system is available under the MIT license. See the LICENSE file for more info.

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real_time_circle_detection_android's Issues

please update it to be used with newer versions of android studio

I can not detect all the circles with Android Camera

Hello,

I need to detect circles taken with their positions X Y, I want to use this data to compare them with the original image to retrieve an ID. It's like the principle of QR Code.

I want to create a system like Snapcode (snapchat)

We want scan like this picture https://ibb.co/gMkEJd with the Android Camera

Cordially,

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