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名师互学网 > IT > 软件开发 > 移动开发 > Android

Android camera实时预览 实时处理,人脸识别示例

Android 更新时间: 发布时间: IT归档 最新发布 模块sitemap

Android camera实时预览 实时处理,人脸识别示例

Android camera实时预览 实时处理,面部认证。

预览操作是网友共享的代码,我在继承SurfaceView 的CameraSurfaceView 中加入了帧监听事件,每次预览监听前五个数据帧,在处理做一个面部识别。

先看目录关系

  • 自定义控件CameraSurfaceView.java
  • 自定义接口方法CameraInterface.java
  • CameraActivity预览界面。

CameraSurfaceView.Java

package com.centaur.camera.preview;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ImageFormat;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.YuvImage;
import android.hardware.Camera;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import com.centaur.camera.camera.CameraInterface;

import java.io.ByteArrayOutputStream;



public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback, Camera.PreviewCallback{


  private static final int FACENUM = 5;

  private static final String TAG = "yanzi";
  CameraInterface mCameraInterface;
  Context mContext;
  SurfaceHolder mSurfaceHolder;

  private boolean isFinish;
  //传输五个bitmap数组
  Bitmap [] bitmaps = new Bitmap[5];

  int number = 0;//作为计数器用

  onFaceCollectListener onFaceCollectListener = null;

  public CameraSurfaceView(Context context, AttributeSet attrs) {
    super(context, attrs);
    mContext = context;
    mSurfaceHolder = getHolder();
    mSurfaceHolder.setFormat(PixelFormat.TRANSPARENT);//translucent半透明 transparent透明
    mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    mSurfaceHolder.addCallback(this);
  }

  @Override
  public void surfaceCreated(SurfaceHolder surfaceHolder) {
    Log.i(TAG, "surfaceCreated...");
  }

  @Override
  public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
    Log.i(TAG, "surfaceChanged...");
  }

  @Override
  public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
    Log.i(TAG, "surfaceDestroyed...");
    CameraInterface.getInstance().doStopCamera();
  }
  public SurfaceHolder getSurfaceHolder(){
    return mSurfaceHolder;
  }

  
  public static interface onFaceCollectListener {

    
    void onFaceCollected(Bitmap[] bitmaps);

    
    void onFaceCollectStart(boolean isStart);
  }
  
  public void setonFaceCollectListener(onFaceCollectListener onFaceCollectListener){

    if(onFaceCollectListener!=null){
      this.onFaceCollectListener = onFaceCollectListener;
    }
  }

  
  @Override
  public void onPreviewframe(byte[] bytes, Camera camera) {
    if(number

CameraInterface.java

package com.centaur.camera.camera;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ImageFormat;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.YuvImage;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;

import com.centaur.camera.util.CamParaUtil;
import com.centaur.camera.util.ImageUtil;
import com.centaur.util.FileUtils;

import java.io.IOException;
import java.util.List;



public class CameraInterface {
  private static final String TAG = "Tianchaoxiong";
  private Camera mCamera;
  private Camera.Parameters mParams;
  private boolean isPreviewing = false;
  private float mPreviwRate = -1f;
  private static CameraInterface mCameraInterface;

  public interface CamOpenOverCallback {
    public void cameraHasOpened();
  }

  private CameraInterface() {

  }

  public static synchronized CameraInterface getInstance() {
    if (mCameraInterface == null) {
      mCameraInterface = new CameraInterface();
    }
    return mCameraInterface;
  }

  
  public void doOpenCamera(CamOpenOverCallback callback) {
    Log.i(TAG, "Camera open....");
    mCamera = Camera.open(1);
    Log.i(TAG, "Camera open over....");
    callback.cameraHasOpened();
  }

  
  public void doStartPreview(SurfaceHolder holder, float previewRate, Camera.PreviewCallback previewCallback) {
    Log.i(TAG, "doStartPreview...");
    if (isPreviewing) {
      mCamera.stopPreview();
      return;
    }
    if (mCamera != null) {

      mParams = mCamera.getParameters();
      mParams.setPictureFormat(PixelFormat.JPEG);//设置拍照后存储的图片格式

      //对支持的图片的大小的一个收集
      CamParaUtil.getInstance().printSupportPictureSize(mParams);
      CamParaUtil.getInstance().printSupportPreviewSize(mParams);
      //设置PreviewSize和PictureSize
      Camera.Size pictureSize = CamParaUtil.getInstance().getPropPictureSize(
   mParams.getSupportedPictureSizes(), previewRate, 800);
      mParams.setPictureSize(pictureSize.width, pictureSize.height);
      Camera.Size previewSize = CamParaUtil.getInstance().getPropPreviewSize(
   mParams.getSupportedPreviewSizes(), previewRate, 800);
      mParams.setPreviewSize(previewSize.width, previewSize.height);

      mCamera.setDisplayOrientation(90);

      CamParaUtil.getInstance().printSupportFocusMode(mParams);
      List focusModes = mParams.getSupportedFocusModes();
      if (focusModes.contains("continuous-video")) {
 mParams.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
      }
      mCamera.setParameters(mParams);  //参数设置完毕

      try {
 mCamera.setPreviewDisplay(holder);
 mCamera.setPreviewCallback(previewCallback);
 mCamera.startPreview();//开启预览
      } catch (IOException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
      }

      isPreviewing = true;
      mPreviwRate = previewRate;

      mParams = mCamera.getParameters(); //重新get一次
      Log.i(TAG, "最终设置:PreviewSize--With = " + mParams.getPreviewSize().width
   + "Height = " + mParams.getPreviewSize().height);
      Log.i(TAG, "最终设置:PictureSize--With = " + mParams.getPictureSize().width
   + "Height = " + mParams.getPictureSize().height);
    }
  }

  
  public void doStopCamera() {
    if (null != mCamera) {
      mCamera.setPreviewCallback(null);
      mCamera.stopPreview();
      isPreviewing = false;
      mPreviwRate = -1f;
      mCamera.release();
      mCamera = null;
    }
  }

  
  public void doTakePicture() {
    if (isPreviewing && (mCamera != null)) {
      Log.d("FileUtils", "程序运行到这里了111");
      mCamera.takePicture(mShutterCallback, null, mJpegPictureCallback);
    }
  }

  
  Camera.ShutterCallback mShutterCallback = new Camera.ShutterCallback()
      //快门按下的回调,在这里我们可以设置类似播放“咔嚓”声之类的操作。默认的就是咔嚓。
  {
    public void onShutter() {
      // TODO Auto-generated method stub
      Log.i(TAG, "myShutterCallback:onShutter...");
    }
  };
  
  Camera.PictureCallback mJpegPictureCallback = new Camera.PictureCallback()
      //对jpeg图像数据的回调,最重要的一个回调
  {
    public void onPictureTaken(byte[] data, Camera camera) {
      Log.d("FileUtils", "程序运行到这里了222");
      // TODO Auto-generated method stub
      Log.i(TAG, "myJpegCallback:onPictureTaken...");
      Bitmap b = null;
      if (null != data) {
 b = BitmapFactory.decodeByteArray(data, 0, data.length);//data是字节数据,将其解析成位图
 mCamera.stopPreview();
 isPreviewing = false;
 Log.d("FileUtils", "程序运行到这里了333");
      }
      //保存图片到sdcard
      if (null != b) {
 Log.d("FileUtils", "程序运行到这里了444");
 //设置FOCUS_MODE_CONTINUOUS_VIDEO)之后,myParam.set("rotation", 90)失效。
 //图片竟然不能旋转了,故这里要旋转下
 Log.d("FileUtils", "程序运行到这里了");
 Bitmap rotaBitmap = ImageUtil.getRotateBitmap(b, -90.0f);
 FileUtils.savePaiZhaoBitmap(rotaBitmap);
      }
    }
  };

}

CameraActivity

package com.centaur.camera.Activity;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Point;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.TextView;

import com.centaur.camera.camera.CameraInterface;
import com.centaur.camera.preview.CameraSurfaceView;
import com.centaur.camera.util.DisplayUtil;
import com.centaur.testutil.R;
import com.centaur.testutil.ShowPic;
import com.centaur.util.DetecteSDK;
import com.centaur.util.DetecteSeeta;



public class CameraActivity extends AppCompatActivity implements CameraSurfaceView.OnFaceCollectListener, CameraInterface.CamOpenOverCallback{
  private static final String TAG = "CameraActivity";

  private float recLen = 0;
  long te;
  float previewRate = -1f;
  DetecteSDK detecteSDK;
  DetecteSeeta detecteSeeta;

  Bitmap bmp;
  Bitmap bitmapfianl;

  private ImageButton shutterBtn;
  private TextView textView;
  private CameraSurfaceView surfaceView = null;


  @Override
  protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    Thread openThread = new Thread(){
      @Override
      public void run() {
 CameraInterface.getInstance().doOpenCamera(CameraActivity.this);
      }
    };
    openThread.start();
    te = System.currentTimeMillis();
    setContentView(R.layout.activity_camera);
    initView();
    initViewParams();
    surfaceView.setonFaceCollectListener(this);

    shutterBtn.setonClickListener(new BtnListeners());
    TimeHandler.postDelayed(TimeRunnable, 500);
  }
  
  @Override
  public void cameraHasOpened() {
    SurfaceHolder holder = surfaceView.getSurfaceHolder();
    CameraInterface.getInstance().doStartPreview(holder, previewRate,surfaceView );
  }

  @Override
  protected void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();
    CameraInterface.getInstance().doStopCamera();
    Log.d("RunTime", "onDestroy:time:"+te);
    TimeHandler.removeCallbacks(TimeRunnable);
  }
  @Override
  protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    CameraInterface.getInstance().doStopCamera();
    te = System.currentTimeMillis()-te;
    Log.d("RunTime", "onPause:time:"+te);
    TimeHandler.removeCallbacks(TimeRunnable);
  }

  Handler TimeHandler = new Handler();
  Runnable TimeRunnable = new Runnable() {
    @Override
    public void run() {
      recLen+=500;
      textView.setText("检测时间:" + recLen/1000+"秒");
      TimeHandler.postDelayed(this, 500);
    }
  };


  private void initView(){
    surfaceView = (CameraSurfaceView)findViewById(R.id.camera_surfaceview);
    shutterBtn = (ImageButton)findViewById(R.id.btn_shutter);
    textView = (TextView) findViewById(R.id.time);
  }
  private void initViewParams(){
    ViewGroup.LayoutParams params = surfaceView.getLayoutParams();
    Point p = DisplayUtil.getScreenMetrics(this);
    params.width = p.x;
    params.height = p.y;
    previewRate = DisplayUtil.getScreenRate(this); //默认全屏的比例预览
    surfaceView.setLayoutParams(params);
    //手动设置拍照ImageButton的大小为120dip×120dip,原图片大小是64×64
    ViewGroup.LayoutParams p2 = shutterBtn.getLayoutParams();
    p2.width = DisplayUtil.dip2px(this, 80);
    p2.height = DisplayUtil.dip2px(this, 80);
    shutterBtn.setLayoutParams(p2);

  }




  
  @Override
  public void onFaceCollected(Bitmap[] bitmaps) {

  }

  
  @Override
  public void onFaceCollectStart(boolean isStart) {
    if(isStart){
      Log.d("CameraActivity","开始收集");
    }

  }

  private class BtnListeners implements View.onClickListener {

    @Override
    public void onClick(View v) {
      // TODO Auto-generated method stub
      switch(v.getId()){
 case R.id.btn_shutter:
   CameraInterface.getInstance().doTakePicture();
   Intent intent =new Intent(CameraActivity.this, ShowPic.class);
   // 默认一个暂存的路径 /FaceDetection/useso/Pictures/Tmp/tmp.png
   String FolderPath = "/FaceDetection/useso/Pictures/Tmp/tmp.png";
   String path = Environment.getExternalStorageDirectory()+FolderPath;
   intent.putExtra("picpath",path);
   startActivity(intent);
   finish();
   break;
 default:break;
      }
    }

  }
}

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持考高分网。

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