Thanks so much! This was really helpful.

Just a note to people having problems getting the faces to be recognized. The FaceDetector documentation says the following:

http://developer.android.com/reference/android/media/FaceDetector.html

Note that the width of the image must be even.

I just did a quick and dirty hack to check if it's odd and then subtract a pixel if it is. It doesn't keep perspective, but this is a really rare case since by default the images from the phone's camera will be even.

Code: Select all

if(picWidth % 2 != 0){
                if(DEBUG){
                        Log.d("picHeight", " "+picHeight);
                       Log.d("picWidth", " "+picWidth);
                 }
                       
                        picWidth = picWidth-1;
                       sourceImage = Bitmap.createBitmap(sourceImage,0,0,picWidth,picHeight);
                 if(DEBUG){
                        Log.d("picHeight", " "+picHeight);
                       Log.d("picWidth", " "+picWidth);
                  }

                }


Any ideas on maintaining perspective?

Great article,

just out of interest could you post the code that instead of hard coding the image, give a user the option of selecting an image from the gallery.

Thank you

Hiii..... new to android...was just trying to run this app & encountered the force close on my emulator ....do i have to make any changes in my manifest file...did everything else right......this is my logcat details

W/Zygote ( 30): Preloaded drawable resource #0x1080093 (res/drawable-mdpi/sym_def_app_icon.png) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x1080002 (res/drawable-mdpi/arrow_down_float.png) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x10800b4 (res/drawable/btn_check.xml) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x10800b7 (res/drawable-mdpi/btn_check_label_background.9.png) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x10800b8 (res/drawable-mdpi/btn_check_off.png) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x10800bd (res/drawable-mdpi/btn_check_on.png) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x1080004 (res/drawable/btn_default.xml) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x1080005 (res/drawable/btn_default_small.xml) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x1080006 (res/drawable/btn_dropdown.xml) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x1080008 (res/drawable/btn_plus.xml) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x1080007 (res/drawable/btn_minus.xml) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x1080009 (res/drawable/btn_radio.xml) that varies with configuration!!

W/Zygote ( 30): Preloaded drawable resource #0x108000a (res/drawable/btn_star.xml) that varies with configuration!!
D/MediaPlayer( 52): Couldn't open file on client side, trying server side

E/MediaPlayerService( 31): Couldn't open fd for content://settings/system/notification_sound

E/MediaPlayer( 52): Unable to to create media player
E/AndroidRuntime( 130): ERROR: thread attach failed

D/ActivityManager( 52): Uninstalling process com.pradeep.naik

D/dalvikvm( 130): LinearAlloc 0x0 used 621708 of 5242880 (11%)

W/ResourceType( 52): Resources don't contain package for resource number 0x7f0700e5

W/ResourceType( 52): Resources don't contain package for resource number 0x7f020031

W/ResourceType( 52): Resources don't contain package for resource number 0x7f020030

W/ResourceType( 52): Resources don't contain package for resource number 0x7f050000

W/ResourceType( 52): Resources don't contain package for resource number 0x7f060000

W/ResourceType( 52): Resources don't contain package for resource number 0x7f060001


Any1 tell me wats the error.....i did copy the image in drawable folder

hi there
thanks for the quick example
im having some problem dublicating the process. im getting a error message on line 42 of the FaceView.Java source file under the sample picture name i have put in res/drawable-hdpi. it is in Bitmap format. am i doing sonething wrong here?
thanks

Hi,


When I ran this code, it says
" java.lang.InstantionException:com.example.facedetection" in the cat log. What should I have to change?Pls help

Can anybody post a copy of complete project ? I am a newbie in android dev.
plz share the complete project which I can directly run on my computer.
thanks

When I try to open the application I get error message saying "The application FaceTest (process com.jrr.facetest) has stopped unexpectedly. Please try again".

I have saved a bmp file of my picture in this location: res/drawable/bao102.bmp (I named the image as "bao102.bmp")

Here's my code:

FaceView.java

Code: Select all


package com.jrr.facetest;

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;

public class FaceView extends View {
   private static final int NUM_FACES = 10; // max is 64
   private static final boolean DEBUG = true;

   private FaceDetector arrayFaces;
   private FaceDetector.Face getAllFaces[] = new FaceDetector.Face[NUM_FACES];
   private FaceDetector.Face getFace = null;
   
   private PointF eyesMidPts[] = new PointF[NUM_FACES];
   private float  eyesDistance[] = new float[NUM_FACES];
   
   private Bitmap sourceImage;
   
   private Paint tmpPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
   private Paint pOuterBullsEye = new Paint(Paint.ANTI_ALIAS_FLAG);
   private Paint pInnerBullsEye = new Paint(Paint.ANTI_ALIAS_FLAG);
   
   private int picWidth, picHeight;
   private float xRatio, yRatio;
   
   public FaceView(Context context) {
      super(context);
      
      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;
      
      sourceImage = BitmapFactory.decodeResource( getResources() ,R.drawable.bao102, bfo);

      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;
            
            if (DEBUG)
            {
               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)
         {
            if (DEBUG) Log.e("Face", i + " is null");
         }
      
      }
   }
   
   @Override
   protected void onDraw(Canvas canvas)
   {
      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);
         }
      }
   }
}


FaceTest.java

Code: Select all


package com.jrr.facetest;

import android.app.Activity;
import android.os.Bundle;

public class FaceTest extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
        FaceView faceView = new FaceView(this);
        setContentView(faceView);
    }
}



Need HELP...

anyone ?

Is there anyone who can help with this ?

I am also having problems with the EULER_X, EULER_Y and EULER_Z always coming back as 0. Has anyone figured this out?