Android编程示例之——人像检测

Android提供了FaceDetector用于检测人像。但是这个仅仅提供检测，也就是说只能判断这个图片是不是人。至于识别具体是哪个人还没有实现。Activity实现：package xuxing.imageprocessing.facedetect;
import android.app.Activity;
import android.os.Bundle;
public class FaceDetectExampleActivity 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）;
}
}
FaceView实现：package xuxing.imageprocessing.facedetect;
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.linyichen2, 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）;
}
}
}
}