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利用Android實現(xiàn)人臉識別并統(tǒng)計人臉數(shù)?相信很多沒有經(jīng)驗的人對此束手無策,為此本文總結(jié)了問題出現(xiàn)的原因和解決方法,通過這篇文章希望你能解決這個問題。
最近項目需求是統(tǒng)計當(dāng)前攝像頭中的人臉個數(shù),安卓有提供現(xiàn)成的Api,最終實現(xiàn)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(yù)覽區(qū)。
2.在SurfaceView創(chuàng)建成功后通過CameraManager獲取當(dāng)前設(shè)備可用的攝像頭。
3.檢測攝像頭權(quán)限。
4.通過CameraManager打開攝像頭。
5.在打開成功的回調(diào)中通過CameraDevice創(chuàng)建會話。
6.在會話創(chuàng)建成功的回調(diào)方法中創(chuàng)建預(yù)覽請求。
7.在預(yù)覽請求的回調(diào)方法onCaptureCompleted()方法中獲取預(yù)覽界面中返回的人臉數(shù)。
以下是實現(xiàn)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(jī)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(jī)的相關(guān)參數(shù) CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraIdList[1]); //可用于判斷是否支持人臉檢測,以及支持到哪種程度 faceDetectModes = characteristics.get(CameraCharacteristics.STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES);//支持的人臉檢測模式 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(yù)覽回調(diào) */ 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 CaptureRequest request, @NonNull CaptureResult partialResult) { super.onCaptureProgressed(session, request, partialResult); } @Override public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) { super.onCaptureCompleted(session, request, 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 CaptureRequest request, @NonNull CaptureFailure failure) { super.onCaptureFailed(session, request, 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 CaptureRequest request, @NonNull Surface target, long frameNumber) { super.onCaptureBufferLost(session, request, target, frameNumber); } };
以下就是所有代碼:
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<>(); /** * 獲取支持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(jī)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(jī)的相關(guān)參數(shù) CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraIdList[1]); //可用于判斷是否支持人臉檢測,以及支持到哪種程度 faceDetectModes = characteristics.get(CameraCharacteristics.STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES);//支持的人臉檢測模式 cameraManager.openCamera(cameraIdList[1], mStateCallback, 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(jī)狀態(tài)回調(diào) */ private CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() { @Override public void onOpened(@NonNull final CameraDevice camera) { //打開成功,可以獲取CameraDevice對象 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, CameraMetadata.CONTROL_MODE_AUTO); captureRequest.set(CaptureRequest.STATISTICS_FACE_DETECT_MODE, getFaceDetectMode()); session.setRepeatingRequest(captureRequest.build(),captureCallback,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) { //斷開連接 Toast.makeText(MainActivity.this, "onDisconnected", Toast.LENGTH_SHORT).show(); } @Override public void onError(@NonNull CameraDevice camera, final int error) { //發(fā)生異常 Toast.makeText(MainActivity.this, "onError", Toast.LENGTH_SHORT).show(); } }; /** * 預(yù)覽回調(diào) */ 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 CaptureRequest request, @NonNull CaptureResult partialResult) { super.onCaptureProgressed(session, request, partialResult); } @Override public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) { super.onCaptureCompleted(session, request, result); Face faces[] = result.get(CaptureResult.STATISTICS_FACES); if (faces.length != face) { Log.e("lee", faces.length + "張臉"); face = faces.length; } } @Override public void onCaptureFailed(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull CaptureFailure failure) { super.onCaptureFailed(session, request, 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 CaptureRequest request, @NonNull Surface target, long frameNumber) { super.onCaptureBufferLost(session, request, target, 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>
看完上述內(nèi)容,你們掌握利用Android實現(xiàn)人臉識別并統(tǒng)計人臉數(shù)的方法了嗎?如果還想學(xué)到更多技能或想了解更多相關(guān)內(nèi)容,歡迎關(guān)注億速云行業(yè)資訊頻道,感謝各位的閱讀!
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