Android開發(fā)人臉識別統(tǒng)計(jì)人臉數(shù)
本文實(shí)例為大家分享了Android開發(fā)人臉識別統(tǒng)計(jì)的具體代碼,供大家參考,具體內(nèi)容如下
最近項(xiàng)目需求是統(tǒng)計(jì)當(dāng)前攝像頭中的人臉個(gè)數(shù),安卓有提供現(xiàn)成的Api,最終實(shí)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(shí)現(xiàn)步驟:
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>
以上就能實(shí)現(xiàn)統(tǒng)計(jì)當(dāng)前攝像頭下有多少個(gè)人臉。
以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
相關(guān)文章
Android開發(fā)之5.0activity跳轉(zhuǎn)時(shí)共享元素的使用方法
下面小編就為大家分享一篇Android開發(fā)之5.0activity跳轉(zhuǎn)時(shí)共享元素的使用方法,具有很好的參考價(jià)值,希望對大家有所幫助。一起跟隨小編過來看看吧2018-01-01使用ListView實(shí)現(xiàn)網(wǎng)上訂餐首頁
這篇文章主要為大家詳細(xì)介紹了使用ListView實(shí)現(xiàn)網(wǎng)上訂餐首頁,文中示例代碼介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們可以參考一下2021-01-01Android視頻懸浮窗口實(shí)現(xiàn)的示例代碼
這篇文章主要介紹了Android視頻懸浮窗口實(shí)現(xiàn)的示例代碼,文中通過示例代碼介紹的非常詳細(xì),對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值,需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧2020-04-04Android中RecyclerView實(shí)現(xiàn)Item添加和刪除的代碼示例
本篇文章主要介紹了Android中RecyclerView實(shí)現(xiàn)Item添加和刪除的代碼示例,非常具有實(shí)用價(jià)值,需要的朋友可以參考下2017-09-09Android中通過view方式獲取當(dāng)前Activity的屏幕截圖實(shí)現(xiàn)方法
這篇文章主要介紹了Android中通過view方式獲取當(dāng)前Activity的屏幕截圖實(shí)現(xiàn)方法,本文方法相對簡單,容易理解,需要的朋友可以參考下2014-09-09Android編程處理窗口控件大小,形狀,像素等UI元素工具類
這篇文章主要介紹了Android編程處理窗口控件大小,形狀,像素等UI元素工具類,可實(shí)現(xiàn)像素與dp的轉(zhuǎn)換、窗口寬度設(shè)置、彈出窗口中l(wèi)istview高度設(shè)置等功能,需要的朋友可以參考下2017-12-12用Android MenuInflater創(chuàng)建菜單項(xiàng)的方法步驟
本篇文章小編為大家介紹,用Android MenuInflater創(chuàng)建菜單項(xiàng)的方法步驟。需要的朋友參考下2013-04-04Android中post請求傳遞json數(shù)據(jù)給服務(wù)端的實(shí)例
下面小編就為大家分享一篇Android中post請求傳遞json數(shù)據(jù)給服務(wù)端的實(shí)例,具有很好的參考價(jià)值,希望對大家有所幫助。一起跟隨小編過來看看吧2018-01-01