Java Code Examples for org.opencv.imgproc.Imgproc#RETR_EXTERNAL

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Example 1
Source File: MainActivity.java    From effective_android_sample with Apache License 2.0 4 votes vote down vote up 
/**
 * OpenCVで
 * @param bmpOrig
 */
private void extractObject(Bitmap bmpOrig) {

    // まずオリジナルのビットマップを表示
    mImageView1.setImageBitmap(bmpOrig);
    // 高さと幅を取得
    int height = bmpOrig.getHeight();
    int width = bmpOrig.getWidth();
    
    // OpenCVオブジェクトの用意
    Mat matOrig = new Mat(height,width,CvType.CV_8UC4); 
    // ビットマップをOpenCVオブジェクトに変換
    Utils.bitmapToMat(bmpOrig, matOrig);
    
    /**
     * グレースケールに変換
     */
    Mat matGray = new Mat(height,width,CvType.CV_8UC1);
    Imgproc.cvtColor(matOrig, matGray, Imgproc.COLOR_RGB2GRAY);
    // 表示
    Bitmap bmpGray = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Utils.matToBitmap(matGray, bmpGray);
    mImageView2.setImageBitmap(bmpGray);

    /**
     * グレースケール→二値化    
     */
    Mat matBlack = new Mat(height,width,CvType.CV_8UC1);
    // 二値化
    Imgproc.threshold(matGray, matBlack, sTH, 255, Imgproc.THRESH_BINARY);
    // 表示
    Bitmap bmpBlack = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Utils.matToBitmap(matBlack, bmpBlack);
    mImageView3.setImageBitmap(bmpBlack);

    /**
     * グレースケール→二値化→輪郭塗りつぶし
     */
    // 輪郭を抽出する
    ArrayList<MatOfPoint> contours = new ArrayList<MatOfPoint>();
    Mat hierarchy = new Mat(matBlack.height(),matBlack.width(),CvType.CV_8UC1);
    int mode = Imgproc.RETR_EXTERNAL;
    int method = Imgproc.CHAIN_APPROX_SIMPLE;

    // 輪郭を抽出する
    Imgproc.findContours(matBlack, contours, hierarchy, mode, method);
    // 輪郭を描く
    Scalar color = new Scalar(255.f, 0.f, 0.f, 0.f);
    Imgproc.drawContours(matBlack, contours, -1, color, 2);
    // 表示
    Bitmap bmpContour = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    org.opencv.android.Utils.matToBitmap(matBlack, bmpContour);
    mImageView4.setImageBitmap(bmpContour);

    // 抽出した輪郭の内部を塗りつぶす
    Imgproc.drawContours(matBlack, contours, -1, color, -1);
    // 表示
    Bitmap bmpContour2 = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    org.opencv.android.Utils.matToBitmap(matBlack, bmpContour2);
    mImageView5.setImageBitmap(bmpContour2);

    
    /**
     * 二値化したマスクを使ってオブジェクトだけをとりだす
     */
    Mat matObject = new Mat(height,width,CvType.CV_8UC4); 
    Core.add(matObject, matOrig, matObject, matBlack);  
    // 表示
    Bitmap bmpObject = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    org.opencv.android.Utils.matToBitmap(matObject, bmpObject);
    mImageView6.setImageBitmap(bmpObject);

    /**
     * とりだしたオブジェクトに外接する矩形のみをBMPとして抜き出す
     */
    Rect rect = Imgproc.boundingRect(contours.get(0));
    Mat matCut = new Mat(matObject, rect);
    // 表示
    Bitmap bmpCut = Bitmap.createBitmap(matCut.cols(), matCut.rows(), Bitmap.Config.ARGB_8888);
    org.opencv.android.Utils.matToBitmap(matCut, bmpCut);
    mImageView7.setImageBitmap(bmpCut);
}