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Thread: image segmentation on android

  1. #1
    Junior Member
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    Default image segmentation on android

    I am trying run this code that I found on the internet:

    package com.opencv.grabcut.android;

    import java.io.IOException;

    import org.opencv.android.Utils;
    import org.opencv.core.Core;
    import org.opencv.core.CvType;
    import org.opencv.core.Mat;
    import org.opencv.core.Point;
    import org.opencv.core.Rect;
    import org.opencv.core.Scalar;
    import org.opencv.highgui.Highgui;
    import org.opencv.imgproc.Imgproc;

    import android.app.Activity;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.Canvas;
    import android.os.Bundle;
    import android.view.Gravity;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.View.OnTouchListener;
    import android.widget.ImageView;
    import android.widget.Toast;


    public class Grabcut extends Activity implements OnTouchListener {
    ImageView imageView;
    Bitmap bitmap;
    Canvas canvas;
    Scalar color = new Scalar(255, 0, 0, 255);
    Point tl, br;
    int counter;
    Bitmap bitmapResult, bitmapBackground;
    Mat dst = new Mat();
    final String pathToImage = "/mnt/sdcard/gcut.png";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.grabcut_main);
    imageView = (ImageView) this.findViewById(R.id.imageView);

    bitmap = BitmapFactory.decodeFile(pathToImage);
    Toast msg = Toast.makeText(Grabcut.this, "Press top left and bottom right of the foreground image", Toast.LENGTH_LONG);

    msg.setGravity(Gravity.TOP|Gravity.LEFT, 0, 0);

    msg.show();
    bitmapResult = bitmap.copy(bitmap.getConfig(), true);
    canvas = new Canvas(bitmapResult);

    imageView.setImageBitmap(bitmapResult);
    imageView.setOnTouchListener(this);

    tl = new Point();
    br = new Point();
    counter = 0;
    }

    //@Override
    public boolean onTouch(View v, MotionEvent event) {

    if (event.getAction() == MotionEvent.ACTION_DOWN) {
    if (counter == 0) {
    tl.x = event.getX();
    tl.y = event.getY();
    counter++;
    } else if (counter == 1) {
    br.x = event.getX();
    br.y = event.getY();
    counter++;

    Mat img = new Mat();
    img = Highgui.imread(pathToImage);
    Mat background = new Mat();
    try {
    background = Utils.loadResource(getApplicationContext(),
    R.drawable.wall);
    } catch (IOException e) {

    e.printStackTrace();
    }

    backgroundSubtracting(img, background);
    Highgui.imwrite("/mnt/sdcard/GRABCUT/rect.png", dst);
    Bitmap jpg = BitmapFactory
    .decodeFile("/mnt/sdcard/GRABCUT/rect.png");

    imageView.setScaleType(ImageView.ScaleType.CENTER_ INSIDE);
    imageView.setAdjustViewBounds(true);
    imageView.setPadding(2, 2, 2, 2);
    imageView.setImageBitmap(jpg);
    imageView.invalidate();
    }
    }

    return true;
    }

    private void backgroundSubtracting(Mat img, Mat background) {
    Mat firstMask = new Mat();
    Mat bgModel = new Mat();
    Mat fgModel = new Mat();
    Mat mask;
    Mat source = new Mat(1, 1, CvType.CV_8U, new Scalar(3.0));
    dst = new Mat();
    Rect rect = new Rect(tl, br);

    Imgproc.grabCut(img, firstMask, rect, bgModel, fgModel, 1, 0 /* GC_INIT_WITH_RECT */);
    Core.compare(firstMask, source/* GC_PR_FGD */, firstMask, Core.CMP_EQ);

    Mat foreground = new Mat(img.size(), CvType.CV_8UC3, new Scalar(255,
    255, 255));
    img.copyTo(foreground, firstMask);

    Core.rectangle(img, tl, br, color);

    Mat tmp = new Mat();
    Imgproc.resize(background, tmp, img.size());
    background = tmp;
    mask = new Mat(foreground.size(), CvType.CV_8UC1, new Scalar(255, 255, 255));

    Imgproc.cvtColor(foreground, mask, 6/* COLOR_BGR2GRAY */);
    Imgproc.threshold(mask, mask, 254, 255, 1 /* THRESH_BINARY_INV */);

    Mat vals = new Mat(1, 1, CvType.CV_8UC3, new Scalar(0.0));
    background.copyTo(dst);

    background.setTo(vals, mask);

    Core.add(background, foreground, dst, mask);

    firstMask.release();
    source.release();
    bgModel.release();
    fgModel.release();
    vals.release();
    }

    }


    I've manage to fix some errors of this program, but there is still one error that I can't fix:

    the error is "wall cannot be resolved or is not a field"

    The error always points on R.drawable.wall inside the the public boolean onTouch()

    please help how can i fix this error...

    thanks


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: image segmentation on android

    Thread moved.

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE GOES HERE
    [/code]
    to get highlighting and preserve formatting.

    the error is "wall cannot be resolved or is not a field"
    Where is wall defined? There should be a definition in the drawable folder.
    If you don't understand my answer, don't ignore it, ask a question.

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