android人脸位置检测,【Android】Android自带人脸检测FaceDetector

package com.example.duanjiwei.applepeardemo1;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

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; //人脸识别的关键类

import android.media.FaceDetector.Face;

import android.view.View;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//setContentView(R.layout.activity_main);

setContentView(new myView(this)); //使用自建的view来显示

Log.i("APP","MainActivity run here");

}

private class myView extends View{

private int imageWidth, imageHeight;

private int numberOfFace = 5; //最大检测的人脸数

private FaceDetector myFaceDetect; //人脸识别类的实例

private FaceDetector.Face[] myFace; //存储多张人脸的数组变量

float myEyesDistance; //两眼之间的距离

int numberOfFaceDetected; //实际检测到的人脸数

Bitmap myBitmap;

public myView(Context context){ //view类的构造函数，必须有

super(context);

BitmapFactory.Options BitmapFactoryOptionsbfo = new BitmapFactory.Options();

BitmapFactoryOptionsbfo.inPreferredConfig = Bitmap.Config.RGB_565; //构造位图生成的参数，必须为565。类名+enum

myBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ddd, BitmapFactoryOptionsbfo);

imageWidth = myBitmap.getWidth();

imageHeight = myBitmap.getHeight();

myFace = new FaceDetector.Face[numberOfFace]; //分配人脸数组空间

myFaceDetect = new FaceDetector(imageWidth, imageHeight, numberOfFace);

numberOfFaceDetected = myFaceDetect.findFaces(myBitmap, myFace); //FaceDetector 构造实例并解析人脸

Log.i("APP","numberOfFaceDetected is " + numberOfFaceDetected);

}

protected void onDraw(Canvas canvas){ //override函数，必有

canvas.drawBitmap(myBitmap, 0, 0, null); //画出位图

Paint myPaint = new Paint();

myPaint.setColor(Color.GREEN);

myPaint.setStyle(Paint.Style.STROKE);

myPaint.setStrokeWidth(3); //设置位图上paint操作的参数

for(int i=0; i < numberOfFaceDetected; i++){

Face face = myFace[i];

PointF myMidPoint = new PointF();

face.getMidPoint(myMidPoint);

myEyesDistance = face.eyesDistance(); //得到人脸中心点和眼间距离参数，并对每个人脸进行画框

canvas.drawRect( //矩形框的位置参数

(int)(myMidPoint.x - myEyesDistance),

(int)(myMidPoint.y - myEyesDistance),

(int)(myMidPoint.x + myEyesDistance),

(int)(myMidPoint.y + myEyesDistance),

myPaint);

}

}

}

}