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需求:根据镜头内看到的人脸,获取其在系统中注册的用户信息
设计方案:
①注册:用户通过前端系统自拍图片发送给后端注册。后端对图片进行人脸特征数据分析,将特征数据保存到用户数据库。
②识别:用户正对设备镜头,通过前端识别到人脸时,对人脸分析获取特征数据,将特征数据发送给后端获取用户信息。后端比对特征数据,将相似度0.9以上中最高的用户返回。
准备:虹软注册账号获取APP_ID和SDK_KEY(付费版还要一个Active_Key)和下载SDK
要使用SDK,得先把sdk放到项目里,然后首次需要激活SDK,每次使用SDK需要初始化
1、先切换到Project视图,将下载的SDK 放到对应位置。然后在build.gradle中引入一下
2、到MainActive中先激活SDK,实际生产中不要每次都去激活,记录首次取激活就好了
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
-
- toActiveFaceSDK(); // 激活
- }
- public void toActiveFaceSDK(){
- int status=FaceEngine.activeOnline(this, 你的APP_ID, 你的SDK_KEY);
-
- if(status == ErrorInfo.MOK || status == ErrorInfo.MERR_ASF_ALREADY_ACTIVATED){
- Toast.makeText(this, "激活成功", Toast.LENGTH_LONG).show();
- initEngine();//激活成功那就去初始化SDK,准备使用
- }else if(status == ErrorInfo.MERR_ASF_VERSION_NOT_SUPPORT){
- Toast.makeText(this, "安卓版本不支持人脸识别", Toast.LENGTH_LONG).show();
- }else{
- Toast.makeText(this, "激活失败,状态码:" + status, Toast.LENGTH_LONG).show();
- }
- }
3、初始化SDK,准备使用,每次页面onDestroy的时候记得对应卸载SDK
- public void initEngine(){ // 初始化sdk
- faceObj = new FaceEngine();
- DetectFaceOrientPriority ftOrient = DetectFaceOrientPriority.ASF_OP_ALL_OUT; // 默认是对拿到的图像进行全角度检测
- // DetectFaceOrientPriority ftOrient = DetectFaceOrientPriority.ASF_OP_270_ONLY; // 270
- afCode = faceObj.init(that.getApplicationContext(),
- DetectMode.ASF_DETECT_MODE_VIDEO,ftOrient,16, 3,
- faceObj.ASF_FACE_DETECT | faceObj.ASF_AGE |faceObj.ASF_FACE3DANGLE
- |faceObj.ASF_GENDER | faceObj.ASF_LIVENESS| faceObj.ASF_FACE_RECOGNITION);
- if (afCode != ErrorInfo.MOK) {
- if(afCode == ErrorInfo.MERR_ASF_NOT_ACTIVATED){
- Toast.makeText(this, "设备SDK未激活", Toast.LENGTH_LONG).show();
- }else{
- Toast.makeText(this, "初始化失败"+afCode, Toast.LENGTH_LONG).show();
- }
- }
- }
- public void unInitEngine() { //卸载SDK
- if (afCode == 0) {
- afCode = faceObj.unInit();
- }
- }
安卓Camera API到目前为止已有三代,ArcFace官方教程给的是Camera 1,但我在AS中引入的时候,会划删除线,提示Out并建议使用Camera2替代。于是乎,我使用Camera2去尝试替换官方的一代写法,虽然勉强成功,但是说实在的各种适配问题层出不穷,里面做适配写的代码占了一大半。So 最终我使用了CameraX,就这个预览自适应,就已经天下无敌了!推荐《为什么使用CameraX》。
1、CameraX需要在build.gradle中引入几个包,如下:
- def camerax_version = "1.1.0-alpha08"
- implementation("androidx.camera:camera-core:${camerax_version}")
- implementation("androidx.camera:camera-camera2:${camerax_version}")
- implementation("androidx.camera:camera-lifecycle:${camerax_version}")
- implementation("androidx.camera:camera-view:1.0.0-alpha25")
- implementation("androidx.camera:camera-extensions:1.0.0-alpha25")
2、创建预览View
- 页面定义变量
- public int rational;
- private Size mImageReaderSize;
- private FaceEngine faceObj; //sdk对象
- private int afCode = -1; // sdk状态
- private ProcessCameraProvider cameraProvider = null; // cameraX对象
- private Preview mPreviewBuild = null; //cameraX的preview
- private PreviewView viewFinder = null; // X的自带预览view
-
- private byte[] nv21 = null; // 实时nv21图像流
-
- protected void onCreate()(
- RelativeLayout layout=that.findViewById(R.id.camerax_preview);
- viewFinder =new PreviewView(that);//我是动态创建了个Preview,你也可以在页面直接写上
- layout.addView(viewFinder);
-
- Point screenSize = new Point(); // 获取屏幕总宽高
- getWindowManager().getDefaultDisplay().getSize(screenSize);//getRealSize就会包括状态栏
- rational = aspectRatio(screenSize.x, screenSize.y);
-
- startCameraX();
- }
-
- private double RATIO_4_3_VALUE = 4.0 / 3.0;
- private double RATIO_16_9_VALUE = 16.0 / 9.0;
- private int aspectRatio(int width, int height) {
- double previewRatio = Math.max(width, height) * 1.00 / Math.min(width, height);
- if (Math.abs(previewRatio - RATIO_4_3_VALUE) <= Math.abs(previewRatio - RATIO_16_9_VALUE)) {
- return AspectRatio.RATIO_4_3;
- }
- return AspectRatio.RATIO_16_9;
- }
3、初始化相机
- private void startCameraX() {
- ListenableFuture<ProcessCameraProvider> providerFuture = ProcessCameraProvider.getInstance(that);
- providerFuture.addListener(() -> {
- try { // 检测CameraProvider可用性
- cameraProvider = providerFuture.get();
- } catch (ExecutionException | InterruptedException e) {
- Toast.makeText(this, "相机X不可用", Toast.LENGTH_LONG).show();
- e.printStackTrace();
- return;
- }
- CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(
- CameraSelector.LENS_FACING_FRONT
- // CameraSelector.LENS_FACING_BACK
- ).build();
-
- //绑定预览
- mPreviewBuild = new Preview.Builder()
- // .setTargetRotation(Surface.ROTATION_180)//设置预览旋转角度
- .build();
-
- mPreviewBuild.setSurfaceProvider(viewFinder.getSurfaceProvider()); // 绑定显示
-
-
- // 图像分析,监听试试获取的图像流
- ImageAnalysis imageAnalysis = new ImageAnalysis.Builder()
- .setTargetAspectRatio(rational)
- .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
- //阻塞模式:ImageAnalysis.STRATEGY_BLOCK_PRODUCER (在此模式下,执行器会依序从相应相机接收帧;这意味着,如果 analyze() 方法所用的时间超过单帧在当前帧速率下的延迟时间,所接收的帧便可能不再是最新的帧,因为在该方法返回之前,新帧会被阻止进入流水线)
- //非阻塞模式: ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST (在此模式下,执行程序在调用 analyze() 方法时会从相机接收最新的可用帧。如果此方法所用的时间超过单帧在当前帧速率下的延迟时间,它可能会跳过某些帧,以便 analyze() 在下一次接收数据时获取相机流水线中的最新可用帧)
- .build();
-
- imageAnalysis.setAnalyzer(
- ContextCompat.getMainExecutor(this),
- new FaceAnalyze.MyAnalyzer() //绑定给我的图片分析类
- );
-
- // 绑定生命周期前先解绑
- cameraProvider.unbindAll();
- // 绑定
- Camera mCameraX = cameraProvider.bindToLifecycle(
- (LifecycleOwner) this
- ,cameraSelector
- ,imageAnalysis
- ,mPreviewBuild);
-
- }, ContextCompat.getMainExecutor(this));
- }
4、图片分析类,ImageUtil里的代码最后给出
- /**
- * 实时预览 Analyzer处理
- */
- private class MyAnalyzer implements ImageAnalysis.Analyzer {
- private byte[] y;
- private byte[] u;
- private byte[] v;
- private ReentrantLock lock = new ReentrantLock();
- private Object mImageReaderLock = 1;//1 available,0 unAvailable
- private long lastDrawTime = 0;
- private int timerSpace = 300; // 识别间隔
- @Override
- public void analyze(@NonNull ImageProxy imageProxy) {
- @SuppressLint("UnsafeOptInUsageError") Image mediaImage = imageProxy.getImage();
- // int rotationDegrees = imageProxy.getImageInfo().getRotationDegrees();
- if(mediaImage != null){
- synchronized (mImageReaderLock) {
- /*识别频率Start 和状态*/
- long start = System.currentTimeMillis();
- if (start - lastDrawTime < timerSpace || !mImageReaderLock.equals(1)) {
- mediaImage.close();
- imageProxy.close();
- return;
- }
- lastDrawTime = System.currentTimeMillis();
- /*识别频率End*/
-
- //判断YUV类型,我们申请的格式类型是YUV_420_888
- if (ImageFormat.YUV_420_888 == mediaImage.getFormat()) {
- Image.Plane[] planes = mediaImage.getPlanes();
- if (mImageReaderSize == null) {
- mImageReaderSize = new Size(planes[0].getRowStride(), mediaImage.getHeight());
- }
-
- lock.lock();
- if (y == null) {
- y = new byte[planes[0].getBuffer().limit() - planes[0].getBuffer().position()];
- u = new byte[planes[1].getBuffer().limit() - planes[1].getBuffer().position()];
- v = new byte[planes[2].getBuffer().limit() - planes[2].getBuffer().position()];
- }
- //从planes中分别获取y、u、v 变量数据
- if (mediaImage.getPlanes()[0].getBuffer().remaining() == y.length) {
- planes[0].getBuffer().get(y);
- planes[1].getBuffer().get(u);
- planes[2].getBuffer().get(v);
-
- if (nv21 == null) {
- nv21 = new byte[planes[0].getRowStride() * mediaImage.getHeight() * 3 / 2];
- }
-
- if (nv21 != null && (nv21.length != planes[0].getRowStride() * mediaImage.getHeight() * 3 / 2)) {
- return;
- }
- // 回传数据是YUV422
- if (y.length / u.length == 2) {
- ImageUtil.yuv422ToYuv420sp(y, u, v, nv21, planes[0].getRowStride(), mediaImage.getHeight());
- }
- // 回传数据是YUV420
- else if (y.length / u.length == 4) {
- nv21 = ImageUtil.yuv420ToNv21(mediaImage);
- }
-
- //调用Arcsoft算法,获取人脸特征
- getFaceInfo(nv21);
- }
- lock.unlock();
- }
- }
- }
-
- //一定要关闭
- mediaImage.close();
- imageProxy.close();
-
- }
-
- }
5、进行人脸特征分析
- /**
- * 获取人脸特征
- */
- private int lastFaceID=-1;
- private void getFaceInfo(byte[] nv21) {
- List<FaceInfo> faceInfoList = new ArrayList<FaceInfo>();
- FaceFeature faceFeature = new FaceFeature();
- //第一步是送数据给arcsoft sdk,检查是否有人脸信息。
- int code = faceObj.detectFaces(nv21, mImageReaderSize.getWidth(),
- mImageReaderSize.getHeight(),
- faceObj.CP_PAF_NV21, faceInfoList);
- //数据检查正常,并且含有人脸信息,则进行下一步的人脸识别。
- if (code == ErrorInfo.MOK && faceInfoList.size() > 0) {
- int newFaceID = faceInfoList.get(0).getFaceId();// 每次不离镜头的同一人脸,其ID均相同
- if (lastFaceID == newFaceID) { // 相同脸则return
- Log.i("人脸ID相同", "旧" + lastFaceID);// + "、新" + newFaceID
- return;
- }
- lastFaceID = newFaceID;
- // long start = System.currentTimeMillis();
- // 特征数据分析部分机型会卡
- code = faceObj.extractFaceFeature(nv21, mImageReaderSize.getWidth(), mImageReaderSize.getHeight(),faceObj.CP_PAF_NV21, faceInfoList.get(0), faceFeature);
- if (code != ErrorInfo.MOK) {
- return;
- }
- byte[] featureData=faceFeature.getFeatureData();//最终的特征数据!!!
- post(featureData); //把数据给后端去查信息
- // Log.e(TAG, "特征长度"+faceFeature.getFeatureData().length);
-
- // long end = System.currentTimeMillis();
- // Log.e(TAG+lastFaceID, "耗时: "+(end-start)+"ms特征数据---: "+featureData.length);
- }
- }
- public class ImageUtil {
- /**
- * 将Y:U:V == 4:2:2的数据转换为nv21
- *
- * @param y Y 数据
- * @param u U 数据
- * @param v V 数据
- * @param nv21 生成的nv21,需要预先分配内存
- * @param stride 步长
- * @param height 图像高度
- */
- public static void yuv422ToYuv420sp(byte[] y, byte[] u, byte[] v, byte[] nv21, int stride, int height) {
- System.arraycopy(y, 0, nv21, 0, y.length);
- // 注意,若length值为 y.length * 3 / 2 会有数组越界的风险,需使用真实数据长度计算
- int length = y.length + u.length / 2 + v.length / 2;
- int uIndex = 0, vIndex = 0;
- for (int i = stride * height; i < length; i += 2) {
- nv21[i] = v[vIndex];
- nv21[i + 1] = u[uIndex];
- vIndex += 2;
- uIndex += 2;
- }
- }
-
- /**
- * 将Y:U:V == 4:1:1的数据转换为nv21
- *
- * @param y Y 数据
- * @param u U 数据
- * @param v V 数据
- * @param nv21 生成的nv21,需要预先分配内存
- * @param stride 步长
- * @param height 图像高度
- */
- public static void yuv420ToYuv420sp(byte[] y, byte[] u, byte[] v, byte[] nv21, int stride, int height) {
- System.arraycopy(y, 0, nv21, 0, y.length);
- // 注意,若length值为 y.length * 3 / 2 会有数组越界的风险,需使用真实数据长度计算
- int length = y.length + u.length + v.length;
- int uIndex = 0, vIndex = 0;
- for (int i = stride * height; i < length; i++) {
- nv21[i] = v[vIndex++];
- nv21[i + 1] = u[uIndex++];
- }
- }
-
- public static byte[] yuv420ToNv21(Image image) {
- Image.Plane[] planes = image.getPlanes();
- ByteBuffer yBuffer = planes[0].getBuffer();
- ByteBuffer uBuffer = planes[1].getBuffer();
- ByteBuffer vBuffer = planes[2].getBuffer();
-
- int ySize = yBuffer.remaining();
- int uSize = uBuffer.remaining();
- int vSize = vBuffer.remaining();
- int size = image.getWidth() * image.getHeight();
- byte[] nv21 = new byte[size * 3 / 2];
- yBuffer.get(nv21, 0, ySize);
- vBuffer.get(nv21, ySize, vSize);
-
- byte[] u = new byte[uSize];
- uBuffer.get(u);
-
- //每隔开一位替换V,达到VU交替
- int pos = ySize + 1;
- for (int i = 0; i < uSize; i++) {
- if (i % 2 == 0) {
- nv21[pos] = u[i];
- pos += 2;
- }
- }
- return nv21;
- }
- public static Bitmap nv21ToBitmap(byte[] nv21,int w, int h) {
- YuvImage image = new YuvImage(nv21, ImageFormat.NV21, w, h, null);
- ByteArrayOutputStream stream = new ByteArrayOutputStream();
- image.compressToJpeg(new Rect(0, 0, w, h), 80, stream);
- Bitmap newBitmap = BitmapFactory.decodeByteArray(stream.toByteArray(), 0, stream.size());
- try{
- stream.close();
- }catch (Exception e){}
- return newBitmap;
- }
- }
That's all
Thanks !!!
人脸路程中的坑《人脸识别坑》
二进制的特征数据怎么发给后台,参考我的另外一篇《安卓form-data形式上传二进制》
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