Android開發人臉識別統計人臉數
阿新 • • 發佈:2020-10-23
本文例項為大家分享了Android開發人臉識別統計的具體程式碼,供大家參考,具體內容如下
最近專案需求是統計當前攝像頭中的人臉個數,安卓有提供現成的Api,最終實現效果如上圖。
分析思路和步奏:
主要使用到的類:SurfaceView、CameraManager、CameraDevice.StateCallback、CameraCaptureSession.StateCallback。
1.通過SurfaceView展示預覽區。
2.在SurfaceView建立成功後通過CameraManager獲取當前裝置可用的攝像頭。
3.檢測攝像頭許可權。
4.通過CameraManager開啟攝像頭。
6.在會話建立成功的回撥方法中建立預覽請求。
7.在預覽請求的回撥方法onCaptureCompleted()方法中獲取預覽介面中返回的人臉數。
以下是實現步奏:
1.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <SurfaceView android:id="@+id/sv" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" /> </LinearLayout>
java
cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE); surfaceHolder = sv.getHolder(); surface = surfaceHolder.getSurface();
//獲取可用的相機列表 String[] cameraIdList = cameraManager.getCameraIdList();
if (checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { // TODO: Consider calling // Activity#requestPermissions // here to request the missing permissions,and then overriding // public void onRequestPermissionsResult(int requestCode,String[] permissions,// int[] grantResults) // to handle the case where the user grants the permission. See the documentation // for Activity#requestPermissions for more details. return; }
//獲取開啟相機的相關引數 CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraIdList[1]); //可用於判斷是否支援人臉檢測,以及支援到哪種程度 faceDetectModes = characteristics.get(CameraCharacteristics.STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES);//支援的人臉檢測模式 cameraManager.openCamera(cameraIdList[1],mStateCallback,null);
camera.createCaptureSession(Arrays.asList(surface),new CameraCaptureSession.StateCallback() { @Override public void onConfigured(@NonNull CameraCaptureSession session) { } @Override public void onConfigureFailed(@NonNull CameraCaptureSession session) { } },new Handler());
CaptureRequest.Builder captureRequest = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW); captureRequest.addTarget(surface); captureRequest.set(CaptureRequest.CONTROL_MODE,CameraMetadata.CONTROL_MODE_AUTO); captureRequest.set(CaptureRequest.STATISTICS_FACE_DETECT_MODE,getFaceDetectMode()); session.setRepeatingRequest(captureRequest.build(),captureCallback,new Handler());
/** * 預覽回撥 */ private CameraCaptureSession.CaptureCallback captureCallback = new CameraCaptureSession.CaptureCallback() { @Override public void onCaptureStarted(@NonNull CameraCaptureSession session,@NonNull CaptureRequest request,long timestamp,long frameNumber) { super.onCaptureStarted(session,request,timestamp,frameNumber); } @Override public void onCaptureProgressed(@NonNull CameraCaptureSession session,@NonNull CaptureResult partialResult) { super.onCaptureProgressed(session,partialResult); } @Override public void onCaptureCompleted(@NonNull CameraCaptureSession session,@NonNull TotalCaptureResult result) { super.onCaptureCompleted(session,result); Face faces[] = result.get(CaptureResult.STATISTICS_FACES); if (faces.length != face) { Log.e("lee",faces.length + "張臉"); } } @Override public void onCaptureFailed(@NonNull CameraCaptureSession session,@NonNull CaptureFailure failure) { super.onCaptureFailed(session,failure); } @Override public void onCaptureSequenceCompleted(@NonNull CameraCaptureSession session,int sequenceId,long frameNumber) { super.onCaptureSequenceCompleted(session,sequenceId,frameNumber); } @Override public void onCaptureSequenceAborted(@NonNull CameraCaptureSession session,int sequenceId) { super.onCaptureSequenceAborted(session,sequenceId); } @Override public void onCaptureBufferLost(@NonNull CameraCaptureSession session,@NonNull Surface target,long frameNumber) { super.onCaptureBufferLost(session,target,frameNumber); } };
以下就是所有程式碼:
MainActivity.java
package com.zg.lcddemo; import android.Manifest; import android.content.ContentValues; import android.content.Context; import android.content.pm.PackageManager; import android.content.res.Configuration; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.ImageFormat; import android.graphics.Rect; import android.graphics.SurfaceTexture; import android.hardware.Camera; import android.hardware.camera2.CameraAccessException; import android.hardware.camera2.CameraCaptureSession; import android.hardware.camera2.CameraCharacteristics; import android.hardware.camera2.CameraDevice; import android.hardware.camera2.CameraManager; import android.hardware.camera2.CameraMetadata; import android.hardware.camera2.CaptureFailure; import android.hardware.camera2.CaptureRequest; import android.hardware.camera2.CaptureResult; import android.hardware.camera2.TotalCaptureResult; import android.hardware.camera2.params.Face; import android.hardware.camera2.params.SessionConfiguration; import android.hardware.camera2.params.StreamConfigurationMap; import android.media.FaceDetector; import android.media.ImageReader; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.os.HandlerThread; import android.os.Message; import android.provider.MediaStore; import android.util.Log; import android.util.Size; import android.view.Surface; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import androidx.annotation.NonNull; import androidx.annotation.RequiresApi; import androidx.appcompat.app.AppCompatActivity; import java.io.BufferedInputStream; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.Arrays; import java.util.Iterator; import java.util.List; import java.util.concurrent.Semaphore; public class MainActivity extends AppCompatActivity { private SurfaceView sv; private SurfaceHolder surfaceHolder; private CameraManager cameraManager; private Surface surface; int[] faceDetectModes; int face; List<Bitmap> bitmaps = new ArrayList<>(); /** * 獲取支援的最高人臉檢測級別 * * @return */ private int getFaceDetectMode() { if (faceDetectModes == null) { return CaptureRequest.STATISTICS_FACE_DETECT_MODE_FULL; } else { return faceDetectModes[faceDetectModes.length - 1]; } } @RequiresApi(api = Build.VERSION_CODES.M) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sv = findViewById(R.id.sv); cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE); surfaceHolder = sv.getHolder(); surface = surfaceHolder.getSurface(); surfaceHolder.addCallback(new SurfaceHolder.Callback() { @RequiresApi(api = Build.VERSION_CODES.M) @Override public void surfaceCreated(SurfaceHolder holder) { try { //獲取可用的相機列表 String[] cameraIdList = cameraManager.getCameraIdList(); if (checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { // TODO: Consider calling // Activity#requestPermissions // here to request the missing permissions,// int[] grantResults) // to handle the case where the user grants the permission. See the documentation // for Activity#requestPermissions for more details. return; } //獲取開啟相機的相關引數 CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraIdList[1]); //可用於判斷是否支援人臉檢測,以及支援到哪種程度 faceDetectModes = characteristics.get(CameraCharacteristics.STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES);//支援的人臉檢測模式 cameraManager.openCamera(cameraIdList[1],null); } catch (CameraAccessException e) { e.printStackTrace(); } } @Override public void surfaceChanged(SurfaceHolder holder,int format,int width,int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { } }); } /** * 相機狀態回撥 */ private CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() { @Override public void onOpened(@NonNull final CameraDevice camera) { //開啟成功,可以獲取CameraDevice物件 try { camera.createCaptureSession(Arrays.asList(surface),new CameraCaptureSession.StateCallback() { @Override public void onConfigured(@NonNull CameraCaptureSession session) { try { CaptureRequest.Builder captureRequest = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW); captureRequest.addTarget(surface); captureRequest.set(CaptureRequest.CONTROL_MODE,new Handler()); } catch (CameraAccessException e) { e.printStackTrace(); } } @Override public void onConfigureFailed(@NonNull CameraCaptureSession session) { } },new Handler()); } catch (CameraAccessException e) { e.printStackTrace(); } } @Override public void onDisconnected(@NonNull CameraDevice camera) { //斷開連線 Toast.makeText(MainActivity.this,"onDisconnected",Toast.LENGTH_SHORT).show(); } @Override public void onError(@NonNull CameraDevice camera,final int error) { //發生異常 Toast.makeText(MainActivity.this,"onError",Toast.LENGTH_SHORT).show(); } }; /** * 預覽回撥 */ private CameraCaptureSession.CaptureCallback captureCallback = new CameraCaptureSession.CaptureCallback() { @Override public void onCaptureStarted(@NonNull CameraCaptureSession session,faces.length + "張臉"); face = faces.length; } } @Override public void onCaptureFailed(@NonNull CameraCaptureSession session,frameNumber); } }; }
xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <SurfaceView android:id="@+id/sv" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" /> </LinearLayout>
以上就能實現統計當前攝像頭下有多少個人臉。
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支援我們。