前言
在这个美即真谛、全民娱乐的时代，可恶乏味的人脸贴纸在各大美颜软件中失去了宽泛的利用，当初曾经不仅局限于相机美颜类软件中，在社交、娱乐类的app中对人脸贴纸、AR贴纸的需要也十分宽泛。本文具体介绍了集成华为HMS ML kit人脸识别实现2d贴纸的集成过程，在前面的文章中咱们还会介绍3D贴纸的开发过程，欢送大家关注哦~
场景
在美颜相机、美图app以及社交类app(如抖音、微博、微信)等须要对拍照，或者对照片进行解决的app都会构建本人特有的贴纸的需要。
开发前筹备
在我的项目级gradle里增加华为maven仓
关上AndroidStudio我的项目级build.gradle文件
增量增加如下maven地址：
buildscript { { maven {url 'http://developer.huawei.com/repo/'} } }allprojects { repositories { maven { url 'http://developer.huawei.com/repo/'} }}在利用级的build.gradle外面加上SDK依赖
// Face detection SDK.implementation 'com.huawei.hms:ml-computer-vision-face:2.0.1.300'// Face detection model.implementation 'com.huawei.hms:ml-computer-vision-face-shape-point-model:2.0.1.300'在AndroidManifest.xml文件外面申请相机、拜访网络和存储权限
<!--相机权限--><uses-feature android:name="android.hardware.camera" /><uses-permission android:name="android.permission.CAMERA" /><!--写权限--><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><!--读权限--><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />代码开发关键步骤
设置人脸检测器
MLFaceAnalyzerSetting detectorOptions;detectorOptions = new MLFaceAnalyzerSetting.Factory() .setFeatureType(MLFaceAnalyzerSetting.TYPE_UNSUPPORT_FEATURES) .setShapeType(MLFaceAnalyzerSetting.TYPE_SHAPES) .allowTracing(MLFaceAnalyzerSetting.MODE_TRACING_FAST) .create();detector = MLAnalyzerFactory.getInstance().getFaceAnalyzer(detectorOptions);这里咱们通过相机回调拿到相机帧数据,并通过调用人脸检测器拿到人脸轮廓点后写入FacePointEngine供贴纸滤镜应用
@Overridepublic void onPreviewFrame(final byte[] imgData, final Camera camera) { int width = mPreviewWidth; int height = mPreviewHeight; long startTime = System.currentTimeMillis(); //设置前后摄方向统一 if (isFrontCamera()){ mOrientation = 0; }else { mOrientation = 2; } MLFrame.Property property = new MLFrame.Property.Creator() .setFormatType(ImageFormat.NV21) .setWidth(width) .setHeight(height) .setQuadrant(mOrientation) .create(); ByteBuffer data = ByteBuffer.wrap(imgData); // 调用人脸检测接口 SparseArray<MLFace> faces = detector.analyseFrame(MLFrame.fromByteBuffer(data,property)); //判断是否获取到人脸信息 if(faces.size()>0){ MLFace mLFace = faces.get(0); EGLFace EGLFace = FacePointEngine.getInstance().getOneFace(0); EGLFace.pitch = mLFace.getRotationAngleX(); EGLFace.yaw = mLFace.getRotationAngleY(); EGLFace.roll = mLFace.getRotationAngleZ() - 90; if (isFrontCamera()) EGLFace.roll = -EGLFace.roll; if (EGLFace.vertexPoints == null) { EGLFace.vertexPoints = new PointF[131]; } int index = 0; // 获取一个人的轮廓点坐标并转化到openGL归一化坐标系下的浮点值 for (MLFaceShape contour : mLFace.getFaceShapeList()) { if (contour == null) { continue; } List<MLPosition> points = contour.getPoints(); for (int i = 0; i < points.size(); i++) { MLPosition point = points.get(i); float x = ( point.getY() / height) * 2 - 1; float y = ( point.getX() / width ) * 2 - 1; if (isFrontCamera()) x = -x; PointF Point = new PointF(x,y); EGLFace.vertexPoints[index] = Point; index++; } } // 插入人脸对象 FacePointEngine.getInstance().putOneFace(0, EGLFace); // 设置人脸个数 FacePointEngine.getInstance().setFaceSize(faces!= null ? faces.size() : 0); }else{ FacePointEngine.getInstance().clearAll(); } long endTime = System.currentTimeMillis(); Log.d("TAG","Face detect time: " + String.valueOf(endTime - startTime));}ML kit接口返回的人脸轮廓点状况如图所示：
介绍如何设计贴纸,首先看一下贴纸数JSON数据定义
public class FaceStickerJson { public int[] centerIndexList; // 核心坐标索引列表，有可能是多个关键点计算中心点 public float offsetX; // 绝对于贴纸核心坐标的x轴偏移像素 public float offsetY; // 绝对于贴纸核心坐标的y轴偏移像素 public float baseScale; // 贴纸基准缩放倍数 public int startIndex; // 人脸起始索引，用于计算人脸的宽度 public int endIndex; // 人脸完结索引，用于计算人脸的宽度 public int width; // 贴纸宽度 public int height; // 贴纸高度 public int frames; // 贴纸帧数 public int action; // 动作，0示意默认显示，这里用来解决贴纸动作等 public String stickerName; // 贴纸名称，用于标记贴纸所在文件夹以及png文件的 public int duration; // 贴纸帧显示距离 public boolean stickerLooping; // 贴纸是否循环渲染 public int maxCount; // 最大贴纸渲染次数...}咱们制作猫耳贴纸JSON文件,通过人脸索引找到眉心84号点和鼻尖85号点别离贴上耳朵和鼻子,而后把它和图片都放在assets目录下
{ "stickerList": [{ "type": "sticker", "centerIndexList": [84], "offsetX": 0.0, "offsetY": 0.0, "baseScale": 1.3024, "startIndex": 11, "endIndex": 28, "width": 495, "height": 120, "frames": 2, "action": 0, "stickerName": "nose", "duration": 100, "stickerLooping": 1, "maxcount": 5 }, { "type": "sticker", "centerIndexList": [83], "offsetX": 0.0, "offsetY": -1.1834, "baseScale": 1.3453, "startIndex": 11, "endIndex": 28, "width": 454, "height": 150, "frames": 2, "action": 0, "stickerName": "ear", "duration": 100, "stickerLooping": 1, "maxcount": 5 }]}这里渲染贴纸纹理咱们应用GLSurfaceView,应用起来比TextureView简略, 首先在onSurfaceChanged实例化贴纸滤镜,传入贴纸门路并开启相机
@Overridepublic void onSurfaceCreated(GL10 gl, EGLConfig config) { GLES30.glClearColor(0.0f, 0.0f, 0.0f, 1.0f); mTextures = new int[1]; mTextures[0] = OpenGLUtils.createOESTexture(); mSurfaceTexture = new SurfaceTexture(mTextures[0]); mSurfaceTexture.setOnFrameAvailableListener(this); //将samplerExternalOES 输出到纹理中 cameraFilter = new CameraFilter(this.context); //设置assets目录下人脸贴纸门路 String folderPath ="cat"; stickerFilter = new FaceStickerFilter(this.context,folderPath); //创立屏幕滤镜对象 screenFilter = new BaseFilter(this.context); facePointsFilter = new FacePointsFilter(this.context); mEGLCamera.openCamera();}而后在onSurfaceChanged初始化贴纸滤镜
@Overridepublic void onSurfaceChanged(GL10 gl, int width, int height) { Log.d(TAG, "onSurfaceChanged. width: " + width + ", height: " + height); int previewWidth = mEGLCamera.getPreviewWidth(); int previewHeight = mEGLCamera.getPreviewHeight(); if (width > height) { setAspectRatio(previewWidth, previewHeight); } else { setAspectRatio(previewHeight, previewWidth); } // 设置画面的大小,创立FrameBuffer,设置显示尺寸 cameraFilter.onInputSizeChanged(previewWidth, previewHeight); cameraFilter.initFrameBuffer(previewWidth, previewHeight); cameraFilter.onDisplaySizeChanged(width, height); stickerFilter.onInputSizeChanged(previewHeight, previewWidth); stickerFilter.initFrameBuffer(previewHeight, previewWidth); stickerFilter.onDisplaySizeChanged(width, height); screenFilter.onInputSizeChanged(previewWidth, previewHeight); screenFilter.initFrameBuffer(previewWidth, previewHeight); screenFilter.onDisplaySizeChanged(width, height); facePointsFilter.onInputSizeChanged(previewHeight, previewWidth); facePointsFilter.onDisplaySizeChanged(width, height); mEGLCamera.startPreview(mSurfaceTexture);}最初通过onDrawFrame把贴纸绘制到屏幕
@Overridepublic void onDrawFrame(GL10 gl) { int textureId; // 革除屏幕和深度缓存 GLES30.glClear(GLES30.GL_COLOR_BUFFER_BIT | GLES30.GL_DEPTH_BUFFER_BIT); //更新获取一张图 mSurfaceTexture.updateTexImage(); //获取SurfaceTexture转化矩阵 mSurfaceTexture.getTransformMatrix(mMatrix); //设置相机显示转化矩阵 cameraFilter.setTextureTransformMatrix(mMatrix); //绘制相机纹理 textureId = cameraFilter.drawFrameBuffer(mTextures[0],mVertexBuffer,mTextureBuffer); //绘制贴纸纹理 textureId = stickerFilter.drawFrameBuffer(textureId,mVertexBuffer,mTextureBuffer); //绘制到屏幕 screenFilter.drawFrame(textureId , mDisplayVertexBuffer, mDisplayTextureBuffer); if(drawFacePoints){ facePointsFilter.drawFrame(textureId, mDisplayVertexBuffer, mDisplayTextureBuffer); }}这样咱们的贴纸就画到人脸上了.
Demo成果
原文链接：https://developer.huawei.com/consumer/cn/forum/topicview?tid=0203324526929930082&fid=18
原作者：旭小夜