常連

注目の的

社会貢献

質問力

私はandroidstudioでアプリ開発を行っています。

#実現したいこと
opencvで赤い色を検知して赤色を白に、それ以外を黒にしてそのあとに赤い物の輪郭の中心座標を返したいです。

#問題点
onCameraViewStopped()の中のinRangeで赤を白に、それ以外を黒にすることはできましたがfindContoursがうまくいっていないのか、輪郭に線を引くことができていません。これでは中心点も出せないですよね？実行しても黒と白の映像しか出てきません


#当該のコード
```java

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import android.view.SurfaceView;
import android.view.WindowManager;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
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.MatOfInt;
import org.opencv.core.MatOfInt4;
import org.opencv.core.MatOfPoint;
import org.opencv.core.MatOfPoint2f;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.imgproc.Imgproc;
import org.opencv.imgproc.Moments;


import java.util.ArrayList;
import java.util.List;

import static org.opencv.core.CvType.CV_8U;
import static org.opencv.core.CvType.CV_8UC1;


public class MainActivity extends Activity implements CameraBridgeViewBase.CvCameraViewListener {
    private static final String TAG = "OCVSample::Activity";

    int i =0;

    private CameraBridgeViewBase mOpenCvCameraView;
    private boolean mIsJavaCamera = true;
    private MenuItem mItemSwitchCamera = null;


    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status) {
            switch (status) {
                // 読み込みが成功したらカメラプレビューを開始
                case LoaderCallbackInterface.SUCCESS:
                {
                    Log.i(TAG, "OpenCV loaded successfully");
                    mOpenCvCameraView.enableView();
                } break;
                default: {
                    super.onManagerConnected(status);
                }break;
            }
        }
    };

    public MainActivity() {
        Log.i(TAG, "Instantiated new " + this.getClass());
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.i(TAG, "called onCreate");
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.activity_main);

        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.camera_view);

        mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);

        mOpenCvCameraView.setCvCameraViewListener(this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mOpenCvCameraView != null)
            mOpenCvCameraView.disableView();
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (!OpenCVLoader.initDebug()) {
            Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
        } else {
            Log.d(TAG, "OpenCV library found inside package. Using it!");
            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mOpenCvCameraView != null)
            mOpenCvCameraView.disableView();
    }


    @Override
    public void onCameraViewStarted(int width, int height) {// カメラプレビュー開始時に呼ばれる
    }

    @Override
    public void onCameraViewStopped() {// カメラプレビュー終了時に呼ばれる
    }

    @Override
    public Mat onCameraFrame(Mat inputFrame) {
        Mat src = inputFrame;
        Mat dst = Mat.zeros(inputFrame.width(),inputFrame.height(),CV_8U);
        Imgproc.cvtColor(src, dst, Imgproc.COLOR_RGB2HSV);//HSVに変換
        Imgproc.medianBlur(dst, dst, 5);
        Mat mask = Mat.zeros(inputFrame.width(),inputFrame.height(),CV_8U);
        Core.inRange(dst, new Scalar(150,100,100),new Scalar(180,255,255),mask);

        Mat hierarchy=Mat.zeros(new Size(5,5), CvType.CV_8UC1);
        Mat invsrc=mask.clone();

        List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
        Imgproc.findContours(invsrc, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_TC89_L1);
        Scalar color=new Scalar(255,0,0);
        Imgproc.drawContours(mask, contours, -1, color,1);

        return mask;
    }
}

```


なぜうまくいかないのかわかる方がいましたらご教授願います。

android  opencvで輪郭描画

私はandroidstudioでアプリ開発を行なっており今opencvを使っています。
フレームの中に入っている緑の色をしている領域の中で一番面積が大きいものを選び出し、その輪郭を囲んだものを画面に表示するものを作りたいと思っています。

#問題点
buildとrunはできてandroidにインストールできます。
起動させた時に一瞬だけ領域を枠で囲めていましたが『アプリを終了します』と出てきてすぐにアプリが終了してしまいました。

関数のconvexityDefectsをコメントアウトしてみると枠で囲むことはできませんが、カメラが起動しエラーは起きません。
どこが間違えいるのか教えていただけないでしょうか？


#当該のコード
```java

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MenuItem;
import android.view.SurfaceView;
import android.view.WindowManager;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
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.MatOfInt;
import org.opencv.core.MatOfInt4;
import org.opencv.core.MatOfPoint;
import org.opencv.core.MatOfPoint2f;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.imgproc.Imgproc;
import org.opencv.imgproc.Moments;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import static org.opencv.core.CvType.CV_8U;


public class MainActivity extends Activity implements CameraBridgeViewBase.CvCameraViewListener {

    int i =0;
    private static final String TAG = "OCVSample::Activity";

    private CameraBridgeViewBase mOpenCvCameraView;
    //private boolean mIsJavaCamera = true;
    //private MenuItem mItemSwitchCamera = null;

    // ライブラリ初期化完了後に呼ばれるコールバック
    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
        // LoaderCallbackInterface.SUCCESSで読み込みが成功したら
        // enableView()でカメラプレビューを開始できる
        @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;
            }
        }
    };

    //Objectの実行時クラスを送信する
    public MainActivity() {
        Log.i(TAG, "Instantiated new " + this.getClass());
    }
    //Activityが初めて生成された時に呼ばれる
    //画面が消えないようにつけたままにしてactivity_mainで作ったレイアウトを表示
    //カメラから撮った画像を表示
    //フレームをキャプチャする毎にonCameraFrameを呼ぶ
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.i(TAG, "called onCreate");
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.activity_main);

        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.camera_view);

        mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);

        mOpenCvCameraView.setCvCameraViewListener(this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mOpenCvCameraView != null)
            mOpenCvCameraView.disableView();
    }
    //Activityが表示された時に呼ばれる
    //ライブラリの読み込み,初期化を行う
    @Override
    protected void onResume() {
        super.onResume();
        if (!OpenCVLoader.initDebug()) {
            Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_3_0, this, mLoaderCallback);
        } else {
            Log.d(TAG, "OpenCV library found inside package. Using it!");
            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }
    }

    //Activityが終わる時に呼び出される
    //映像が残っていた場合消す
    @Override
    protected void onDestroy() {
        super.onDestroy();

        if (mOpenCvCameraView != null)
            mOpenCvCameraView.disableView();
    }

// カメラプレビュー開始時に呼ばれる
    @Override
    public void onCameraViewStarted(int width, int height) {

    }

    // カメラプレビュー終了時に呼ばれる
    @Override
    public void onCameraViewStopped() {

    }

   
    @Override
    public Mat onCameraFrame(Mat inputFrame) {
        Mat src = inputFrame;
        Mat dst = Mat.zeros(inputFrame.width(),inputFrame.height(),CV_8U);
        Imgproc.cvtColor(src, dst, Imgproc.COLOR_RGB2HSV);//HSVに変換
        Imgproc.medianBlur(dst, dst, 3);
        Mat dst2 = greenDetect(dst);

        List<MatOfPoint> contours=new ArrayList<MatOfPoint>();
        Mat hierarchy = new Mat(dst2.cols(), dst2.rows(),
                CvType.CV_32SC1);
        Imgproc.findContours(dst2,contours,hierarchy,Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);

        //double tmp1 = Imgproc.contourArea(dst2);
        int index = -1;
        double area = 0;
        int n = contours.size();

        i = i +1;
        if (i < n){//面積が一番大きいものを探す
            double tmp = Imgproc.contourArea(contours.get(i));
            if (area < tmp) {
                area = tmp;
                index = i;//一番面積が大きかったiの番号
            }
        }

        if (index != -1) {
            MatOfInt hull = new MatOfInt();
            MatOfPoint contour = contours.get(index);
            Imgproc.convexHull(contour, hull);

            Point data[] = contour.toArray();
            int v = -1;
            for (int i : hull.toArray()) {
                if (v == -1) {
                    v = i;
                } else {
                    Imgproc.line(src, data[i], data[v], new Scalar(0, 255, 0));
                    v = i;
                }
            }
            convexityDefects(src, contour,hull);
            Imgproc.drawContours(src, contours, index, new Scalar(255, 0, 0));
        }

        return src;


    }

    Mat greenDetect(Mat mat){
        Mat mat1 = new Mat();
        Core.inRange(mat, new Scalar(30,70,70),new Scalar(70,250,250),mat1);
        return mat1;
    }

    Point getcenter(MatOfPoint2f map)
    {
        Moments moments = Imgproc.moments(map);
        Point centroid = new Point();
        centroid.x = moments.get_m10() / moments.get_m00();
        centroid.y = moments.get_m01() / moments.get_m00();
        return centroid;
    }

    void convexityDefects(Mat img,MatOfPoint contour,MatOfInt hull) {
        Point data[] = contour.toArray();
        MatOfInt4 convexityDefects = new MatOfInt4();
        Imgproc.convexityDefects(contour, hull, convexityDefects);
        int cd[] = convexityDefects.toArray();
        if(cd==null)return;
        int j = 0;
        if  (j < cd.length) {
            j = j + 4;
            Imgproc.line(img, data[cd[j+1]], data[cd[j+2]], new Scalar(255,255,255));
            Imgproc.line(img, data[cd[j]], data[cd[j+2]], new Scalar(255,255,255));
        }
    }



}

```

android opencv で色検出

###前提・実現したいこと
MessageAPIを利用して送信する方法が分からなくて詰まっています。
mobile\SubActivity.java内の**IntsumKido**の値をwearに送るにはどうすればいいでしょうか。


先日SmartWatchを購入したばかりで勉強中です。
データの送受信について触れてみようと思っているのですが難しい…
Webでも調べたんですがpathやnodeの理解が浅いせいか、試行錯誤しても上手くいきませんでした。

###mobile\SubActivity.java
```ここに言語を入力
package com.example.taka.wtf;

import android.app.Activity;
import android.os.Bundle;
import java.io.IOException;
import java.util.Collection;
import java.util.HashSet;

import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.PorterDuff.Mode;
import android.graphics.SurfaceTexture;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.wearable.DataApi;
import com.google.android.gms.wearable.DataMap;
import com.google.android.gms.wearable.MessageApi;
import com.google.android.gms.wearable.Node;
import com.google.android.gms.wearable.NodeApi;
import com.google.android.gms.wearable.PutDataMapRequest;
import com.google.android.gms.wearable.PutDataRequest;
import com.google.android.gms.wearable.Wearable;


public class SubActivity extends Activity {

    private GoogleApiClient client;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        CameraView view = new CameraView(this);
        setContentView(view);

        this.client = new GoogleApiClient.Builder(this)
        .addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
            @Override
            public void onConnected(Bundle bundle) {
                Log.d("MyFragment", "onConnected");
            }
            @Override
            public void onConnectionSuspended(int i) {
                Log.d("MyFragment", "onConnectionSuspended");
            }
        })
        .addOnConnectionFailedListener(new GoogleApiClient.OnConnectionFailedListener() {
            @Override
            public void onConnectionFailed(ConnectionResult connectionResult) {
                Log.d("MyFragment", "onConnectionFailed");
            }
        })
        .addApi(Wearable.API)
        .build();
this.client.connect();
    }

    public class CameraView extends SurfaceView implements SurfaceHolder.Callback, Camera.PreviewCallback {
        private Camera mCamera = null;
        private SurfaceTexture mSurfaceTexture = null;
        private static final int Width = 640;
        private static final int Height = 480;
        private int Buffer;
        private float[] Kido;
        private int str;
        private static final int Width2 = 50;
        private static final int Scope = 200;
        private int strstr;
        private int Start;
        private Paint ShindenzuLine = new Paint();
        private SurfaceHolder Holder = null;
        private float sumKido = 0.0f;
        private int frame = 0;
        private int IntsumKido;

        public CameraView(Context context) {
            super(context);
            ShindenzuLine.setColor(Color.rgb(0, 255, 0));
            ShindenzuLine.setStrokeWidth(3);
            ShindenzuLine.setStyle(Style.STROKE);
            Holder = getHolder();
            Holder.addCallback(this);
        }

        public void surfaceCreated(SurfaceHolder holder) {
            Buffer = getWidth();
            Kido = new float[Buffer];
            str = (Buffer - Width2 * 2) / Scope;
            mCamera = Camera.open();
            try {
                mSurfaceTexture = new SurfaceTexture(0);
                mCamera.setPreviewTexture(mSurfaceTexture);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
            stopPreview();
            Camera.Parameters params = mCamera.getParameters();
            params.setPreviewSize(Width, Height);
            params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
            mCamera.setParameters(params);
            Start = 0;
            strstr = 0;
            startPreview();
        }

        public void surfaceDestroyed(SurfaceHolder holder) {
            stopPreview();
            mCamera.release();
            mCamera = null;
        }

        @Override
        public void onPreviewFrame(byte[] data, Camera camera) {
            Kido[strstr % Buffer] = KidoKeisan(data);
            strstr++;
            Shindenzu();
        }

        private void startPreview() {
            mCamera.setPreviewCallback(this);
            mCamera.startPreview();
        }

        private void stopPreview() {
            mCamera.setPreviewCallback(null);
            mCamera.stopPreview();
        }

        private float KidoKeisan(byte[] data) {


            for (int y = Height / 4; y < Height * 3 / 4; y++) {
                for (int x = Width / 4; x < Width * 3 / 4; x++) {
                    sumKido += (float) (data[y * Width + x] & 0xff);
                    frame++;
                }
            }
            sumKido /= frame;
            IntsumKido = (int)sumKido;
            return sumKido;
        }

        private void Shindenzu() {
            int idx, idx_1;
            Canvas canvas = Holder.lockCanvas();
            if (canvas != null) {
                canvas.drawColor(0, Mode.CLEAR);
                if (strstr >= Scope) {
                    Start++;
                }
                for (int i = Start, x = 0; i < strstr - 1; i++, x++) {
                    idx = i % Buffer;
                    idx_1 = (i + 1) % Buffer;
                    canvas.drawLine(x * str + Width2, (Kido[idx] - 80) * 20, (x + 1) * str + Width2, (Kido[idx_1] - 80) * 20, ShindenzuLine);
                }
                Holder.unlockCanvasAndPost(canvas);
            }
        }


    }
}
```

###wear\MainActivity.java

```
package com.example.taka.wtf;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.wearable.DataApi;
import com.google.android.gms.wearable.DataMap;
import com.google.android.gms.wearable.PutDataMapRequest;
import com.google.android.gms.wearable.PutDataRequest;
import com.google.android.gms.wearable.Wearable;


public class MainActivity extends Activity
        implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{

    int gamenID = R.layout.rect_activity_main;
    private GoogleApiClient mGoogleApiClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rect_activity_main);

    mGoogleApiClient = new GoogleApiClient
    .Builder(this)
    .addConnectionCallbacks(this)
    .addOnConnectionFailedListener(this)
    .addApi(Wearable.API)
    .build();
    }


    @Override
    protected void onResume() {
        super.onResume();
        mGoogleApiClient.connect();
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
    }

    @Override
    public void onConnected(Bundle bundle) {
        Log.d("TAG", "onConnected");
    }

    @Override
    public void onConnectionSuspended(int i) {
        Log.d("TAG", "onConnectionSuspended");
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.e("TAG", "onConnectionFailed: " + connectionResult);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

		if(event.getAction() == MotionEvent.ACTION_MOVE){
			if(gamenID == R.layout.rect_activity_main){
				setContentView(R.layout.lill);
                gamenID = R.layout.lill;
			}
            else if(gamenID == R.layout.lill){
				setContentView(R.layout.resonance);
                gamenID = R.layout.resonance;
			}
            else if(gamenID == R.layout.resonance){
                setContentView(R.layout.stress);
                gamenID = R.layout.stress;
            }
            else if(gamenID == R.layout.stress){
                setContentView(R.layout.hi_stress);
                gamenID = R.layout.hi_stress;
            }
		}
		return super.onTouchEvent(event);
	}
}

```