android-人脸检测FaceDetector

无意中看到这个类，就查了一下。
FaceDetector检测到的并不是人的全脸，而只是双眼。

实际测试中，发现图片太小的话检测不到人脸，试验中使用小于100x100的图片检测不到人脸，但是由于Android内存有限，图片太大的话，会出现无法加载图片的异常。图片的格式必须为Bitmap RGB565格式。

文档 findFaces(Bitmap bitmap, Face[] faces)方法中有说明。

方法有

float confidence() ;可信度（0-1）

float eyesDistance(); 双眼的距离

void getMidPoint(PointF point);设置双眼的中点

float pose(int euler); 眼睛的pose，传入的为欧拉轴检索的角度。

view plaincopy to clipboardprint?package com.shao.face;

import android.app.Activity;
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.media.FaceDetector;
import android.media.FaceDetector.Face;
import android.os.Bundle;
import android.view.View;

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

    private class myView extends View{

        private int imageWidth, imageHeight;
        private int numberOfFace = 5;
        private FaceDetector myFaceDetect;
        private FaceDetector.Face[] myFace;
        float myEyesDistance,mConfidence ,mPose;
        int numberOfFaceDetected;

        Bitmap myBitmap;

        public myView(Context context) {
            super(context);
            BitmapFactory.Options BitmapFactoryOptionsbfo = new BitmapFactory.Options();
            BitmapFactoryOptionsbfo.inPreferredConfig = Bitmap.Config.RGB_565;
            myBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.images2, BitmapFactoryOptionsbfo);
            imageWidth = myBitmap.getWidth();
            imageHeight = myBitmap.getHeight();
            myFace = new FaceDetector.Face[numberOfFace];
            myFaceDetect = new FaceDetector(imageWidth, imageHeight, numberOfFace);
            numberOfFaceDetected = myFaceDetect.findFaces(myBitmap, myFace);
        }

        protected void onDraw(Canvas canvas) {
            // TODO Auto-generated method stub

            canvas.drawBitmap(myBitmap, 0, 0, null);

            Paint myPaint = new Paint();
            myPaint.setColor(Color.GREEN);
            myPaint.setStyle(Paint.Style.STROKE);
            myPaint.setStrokeWidth(3);

            for(int i=0; i < numberOfFaceDetected; i++)
            {
                Face face = myFace[i];
                PointF myMidPoint = new PointF();
                face.getMidPoint(myMidPoint);
                myEyesDistance = face.eyesDistance();
                mConfidence = face.confidence();
                System.out.println("mConfidence"+mConfidence);
                mPose = face.pose(face.EULER_X);
                System.out.println("mPose"+mPose);
                canvas.drawRect(
                        (int)(myMidPoint.x - myEyesDistance),
                        (int)(myMidPoint.y - myEyesDistance),
                        (int)(myMidPoint.x + myEyesDistance),
                        (int)(myMidPoint.y + myEyesDistance),
                        myPaint);
            }
        }
    }
}

补充：移动开发 , Android ,