Sample2NativeCamera.java

package org.opencv.samples.tutorial2;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener;
import org.opencv.highgui.Highgui;
import org.opencv.imgproc.Imgproc;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.WindowManager;

public class Sample2NativeCamera extends Activity implements CvCameraViewListener {
    private static final String  TAG             = "OCVSample::Activity";

    public static final int      VIEW_MODE_RGBA  = 0;
    public static final int      VIEW_MODE_GRAY  = 1;
    public static final int      VIEW_MODE_CANNY = 2;

    private static int           viewMode       = VIEW_MODE_RGBA;
    private MenuItem             mItemPreviewRGBA;
    private MenuItem             mItemPreviewGray;
    private MenuItem             mItemPreviewCanny;
    private Mat                  mRgba;
    private Mat                  mIntermediateMat;

    private CameraBridgeViewBase mOpenCvCameraView;

    private BaseLoaderCallback  mLoaderCallback = new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status) {
            switch (status) {
                case LoaderCallbackInterface.SUCCESS:
                {
                    Log.i(TAG, "OpenCV loaded successfully");
                    mOpenCvCameraView.enableView();
                } break;
                default:
                {
                    super.onManagerConnected(status);
                } break;
            }
        }
    };

    public Sample2NativeCamera() {
        Log.i(TAG, "Instantiated new " + this.getClass());
    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.i(TAG, "called onCreate");
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        setContentView(R.layout.tutorial2_surface_view);

        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial2_activity_surface_view);
        mOpenCvCameraView.setCvCameraViewListener(this);
    }

    @Override
    public void onPause()
    {
        if (mOpenCvCameraView != null)
            mOpenCvCameraView.disableView();
        super.onPause();
    }

    @Override
    public void onResume()
    {
        super.onResume();
        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
    }

    public void onDestroy() {
        super.onDestroy();
        if (mOpenCvCameraView != null)
            mOpenCvCameraView.disableView();
    }

    public void onCameraViewStarted(int width, int height) {
        mRgba = new Mat(height, width, CvType.CV_8UC4);
        mIntermediateMat = new Mat(height, width, CvType.CV_8UC4);
    }

    public void onCameraViewStopped() {
        mRgba.release();
        mIntermediateMat.release();
    }

    public Mat onCameraFrame(Mat inputFrame) {
        switch (Sample2NativeCamera.viewMode) {
            case Sample2NativeCamera.VIEW_MODE_GRAY:
            {
            	long start = System.nanoTime();
                Imgproc.cvtColor(inputFrame, mRgba, Imgproc.COLOR_GRAY2RGBA, 4);
                long end = System.nanoTime();
                System.out.println("time is:" + (end - start));
            } break;
            case Sample2NativeCamera.VIEW_MODE_RGBA:
            {
            	long start = System.nanoTime();
                inputFrame.copyTo(mRgba);
                Core.putText(mRgba, "OpenCV+Android", new Point(10, inputFrame.rows() - 10), 3, 1, new Scalar(255, 0, 0, 255), 2);
                long end = System.nanoTime();
                System.out.println("time is:" + (end - start));
            } break;
            case Sample2NativeCamera.VIEW_MODE_CANNY:
            {
            	long start = System.nanoTime();
                Imgproc.Canny(inputFrame, mIntermediateMat, 80, 100);
                Imgproc.cvtColor(mIntermediateMat, mRgba, Imgproc.COLOR_GRAY2BGRA, 4);
                long end = System.nanoTime();
                System.out.println("time is:" + (end - start));
            } break;
        }

        return mRgba;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        Log.i(TAG, "called onCreateOptionsMenu");
        mItemPreviewRGBA = menu.add("Preview RGBA");
        mItemPreviewGray = menu.add("Preview GRAY");
        mItemPreviewCanny = menu.add("Canny");
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Log.i(TAG, "called onOptionsItemSelected; selected item: " + item);
        if (item == mItemPreviewRGBA)
        {
            mOpenCvCameraView.SetCaptureFormat(Highgui.CV_CAP_ANDROID_COLOR_FRAME_RGBA);
            viewMode = VIEW_MODE_RGBA;
        }
        else if (item == mItemPreviewGray)
        {
            mOpenCvCameraView.SetCaptureFormat(Highgui.CV_CAP_ANDROID_GREY_FRAME);
            viewMode = VIEW_MODE_GRAY;
        }
        else if (item == mItemPreviewCanny)
        {
            mOpenCvCameraView.SetCaptureFormat(Highgui.CV_CAP_ANDROID_GREY_FRAME);
            viewMode = VIEW_MODE_CANNY;
        }

        return true;
    }
}