FaceDetectionView.java

/**
 * 
 */
package com.examples.androface;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PointF;
import android.graphics.Rect;
import android.media.FaceDetector;
import android.util.Log;
import android.view.View;

/**
 * @author wdavid01
 * 
 */
public class FaceDetectionView extends View
  {
    private static final String tag = FaceDetectionView.class.getName();
    private static final int NUM_FACES = 10;
    private FaceDetector arrayFaces;
    private final FaceDetector.Face getAllFaces[] = new FaceDetector.Face[NUM_FACES];
    private FaceDetector.Face getFace = null;

    private final PointF eyesMidPts[] = new PointF[NUM_FACES];
    private final float eyesDistance[] = new float[NUM_FACES];

    private Bitmap sourceImage;

    private final Paint tmpPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private final Paint pOuterBullsEye = new Paint(Paint.ANTI_ALIAS_FLAG);
    private final Paint pInnerBullsEye = new Paint(Paint.ANTI_ALIAS_FLAG);

    private int picWidth, picHeight;
    private float xRatio, yRatio;
    private ImageLoader mImageLoader = null;

    public FaceDetectionView(Context context, String imagePath)
      {
        super(context);
        init();
        mImageLoader = ImageLoader.getInstance(context);
        sourceImage = mImageLoader.loadFromFile(imagePath);
        detectFaces();

      }

    private void init()
      {
        Log.d(tag, "Init()...");
        pInnerBullsEye.setStyle(Paint.Style.FILL);
        pInnerBullsEye.setColor(Color.RED);
        pOuterBullsEye.setStyle(Paint.Style.STROKE);
        pOuterBullsEye.setColor(Color.RED);
        tmpPaint.setStyle(Paint.Style.STROKE);
        tmpPaint.setTextAlign(Paint.Align.CENTER);
        BitmapFactory.Options bfo = new BitmapFactory.Options();
        bfo.inPreferredConfig = Bitmap.Config.RGB_565;

      }

    private void loadImage(String imagePath)
      {
        sourceImage = mImageLoader.loadFromFile(imagePath);
      }

    @Override
    protected void onDraw(Canvas canvas)
      {
        Log.d(tag, "onDraw()...");

        xRatio = getWidth() * 1.0f / picWidth;
        yRatio = getHeight() * 1.0f / picHeight;
        canvas.drawBitmap(sourceImage, null, new Rect(0, 0, getWidth(), getHeight()), tmpPaint);
        for (int i = 0; i < eyesMidPts.length; i++)
          {
            if (eyesMidPts[i] != null)
              {
                pOuterBullsEye.setStrokeWidth(eyesDistance[i] / 6);
                canvas.drawCircle(eyesMidPts[i].x * xRatio, eyesMidPts[i].y * yRatio, eyesDistance[i] / 2, pOuterBullsEye);
                canvas.drawCircle(eyesMidPts[i].x * xRatio, eyesMidPts[i].y * yRatio, eyesDistance[i] / 6, pInnerBullsEye);
              }
          }
      }

    private void detectFaces()
      {
        Log.d(tag, "detectFaces()...");

        picWidth = sourceImage.getWidth();
        picHeight = sourceImage.getHeight();

        arrayFaces = new FaceDetector(picWidth, picHeight, NUM_FACES);
        arrayFaces.findFaces(sourceImage, getAllFaces);

        for (int i = 0; i < getAllFaces.length; i++)
          {
            getFace = getAllFaces[i];
            try
              {
                PointF eyesMP = new PointF();
                getFace.getMidPoint(eyesMP);
                eyesDistance[i] = getFace.eyesDistance();
                eyesMidPts[i] = eyesMP;

                Log.i("Face", i + " " + getFace.confidence() + " " + getFace.eyesDistance() + " " + "Pose: (" + getFace.pose(FaceDetector.Face.EULER_X) + "," + getFace.pose(FaceDetector.Face.EULER_Y) + "," + getFace.pose(FaceDetector.Face.EULER_Z) + ")" + "Eyes Midpoint: (" + eyesMidPts[i].x + "," + eyesMidPts[i].y + ")");

              }
            catch (Exception e)
              {
                Log.e("Face", i + " is null");
              }
          }
      }
  }