Android Open Source - AndroidHandsOn Face Detection

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Back to project page AndroidHandsOn.
License

The source code is released under:
Apache License
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Java Source Code

package com.globant.mobile.handson.media;
//from  www  .j av  a  2  s .c om
import java.io.IOException;
import java.io.InputStream;

import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PointF;
import android.media.FaceDetector;
import android.media.FaceDetector.Face;
import android.util.Log;

public class FaceDetection {
  
  private static final String ASSET = "mustache_256.png";
  private static final String TAG = "FaceDetection";


  public static Bitmap detectFaces(Bitmap bitmap){
    //Face Detection
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        
        FaceDetector detector = new FaceDetector(width, height, 5);
        Face[] faces = new Face[5];
        
        Bitmap bitmap565 = Bitmap.createBitmap(width, height, Config.RGB_565);
        Paint ditherPaint = new Paint();
        Paint drawPaint = new Paint();
        
        ditherPaint.setDither(true);
        drawPaint.setColor(Color.YELLOW);
        drawPaint.setStyle(Paint.Style.STROKE);
        drawPaint.setStrokeWidth(2);
        
        Canvas canvas = new Canvas();
        canvas.setBitmap(bitmap565);
        canvas.drawBitmap(bitmap, 0, 0, ditherPaint);
        
        int facesFound = detector.findFaces(bitmap565, faces);
        PointF midPoint = new PointF();
        float eyeDistance = 0.0f;        
        
        if(facesFound > 0){
          for(int i = 0; i < facesFound; i++){
            faces[i].getMidPoint(midPoint);
            eyeDistance = faces[i].eyesDistance();
            
            canvas.drawRect((int)midPoint.x - eyeDistance, 
                (int)midPoint.y - eyeDistance,
                (int)midPoint.x + eyeDistance,
                (int)midPoint.y + eyeDistance, drawPaint);
          }
          
          //return the bitmap with the marked faces
          return bitmap565;
        }else{
          return bitmap;
        }
  }
  
  public Bitmap putMustache(Bitmap bitmap, AssetManager manager){
    //Face Detection
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        
        FaceDetector detector = new FaceDetector(width, height, 5);
        Face[] faces = new Face[5];
        
        Bitmap bitmap565 = Bitmap.createBitmap(width, height, Config.RGB_565);
        Paint ditherPaint = new Paint();
        Paint drawPaint = new Paint();
        
        ditherPaint.setDither(true);
        /*drawPaint.setColor(Color.YELLOW);
        drawPaint.setStyle(Paint.Style.STROKE);
        drawPaint.setStrokeWidth(2);*/
        
        Canvas canvas = new Canvas();
        canvas.setBitmap(bitmap565);
        canvas.drawBitmap(bitmap, 0, 0, ditherPaint);
        
        int facesFound = detector.findFaces(bitmap565, faces);
        PointF midPoint = new PointF();
        float eyeDistance = 0.0f;        
        
        if(facesFound > 0){
          for(int i = 0; i < facesFound; i++){
            faces[i].getMidPoint(midPoint);
            eyeDistance = faces[i].eyesDistance();            
            Bitmap mustache = loadMustacheBitmap(eyeDistance, manager);
            
            canvas.drawBitmap(mustache, 
                (int)midPoint.x - (int)(mustache.getWidth() / 2), 
                (int)midPoint.y + (int)(eyeDistance / 3), 
                null);
          }
          
          //return the bitmap with the marked faces
          return bitmap565;
        }else{
          return bitmap;
        }
  }
  
  private Bitmap loadMustacheBitmap(float eyeDistance, AssetManager manager){
    Bitmap mustache = null;    
    InputStream is = null;
    
    try{
      is = manager.open(ASSET);
      Bitmap assetMustache = BitmapFactory.decodeStream(is);
      //Scale the mustache from eye distance, it will have the same width
      int width = assetMustache.getWidth();
      int height = assetMustache.getHeight();
      float scaleWidth = eyeDistance / (float)width;
      float scaleHeight = eyeDistance / (float)height;
      //create a Matrix for the manipulation
      Matrix matrix = new Matrix();
      //Resize the bitmap
      matrix.postScale(scaleWidth, scaleHeight);
      //Recreate the new bitmap
      mustache = Bitmap.createBitmap(assetMustache, 0, 0, width, height, matrix, false);
    }catch(IOException e){
      Log.e(TAG, e.getMessage(), e);
    }finally{
      if(is != null){
        try{
          is.close();
        }catch(IOException e){
          Log.e(TAG, e.getMessage(), e);
        }
      }
    }
    
    return mustache;
  }
}
Java Source Code List
