RxArcFace —— 基于虹软人脸识别SDK的Rx封装

简介

虽然各厂商为我们提供了优质的人脸识别SDK,但其中包含了较多的无意义代码,例如错误处理,检测,剖析,而开发者在接入时往往不是非常关心这些事情,RxArcFace旨在将虹软人脸识别SDK的模板化操作封装,并结合RxJava2,带给开发者流畅的开发体验

项目地址: https://github.com/ZYF99/RxArcFace

关于虹软人脸识别SDK

虹软人脸人脸识别SDK:ArcFace 离线SDK,包含人脸检测、性别检测、年龄检测、人脸识别、图像质量检测、RGB活体检测、IR活体检测等能力,初次使用时需联网激活,激活后即可在本地无网络环境下工作,可根据具体的业务需求结合人脸识别SDK灵活地进行应用层开发。

基础版本暂不支持图像质量检测以及离线激活

0. 引子

人脸识别在当今已不是稀奇的功能,许多业务场景都能看到人脸识别的影子。作为移动应用开发者,选择接入合适的SDK能为我们带来更高效的开发体验;本文首先将以虹软人脸识别SDK基础方法为切入点逐渐探讨,但官方SDK未免过于繁琐,所以文章带领读者将其封装,基于官方方法打造自己的高可用,多场景可用的Util,使人脸开发无需繁琐的过程即可轻松接入。

SDK准备工作请参考
https://ai.arcsoft.com.cn/manual/docs#/139
https://ai.arcsoft.com.cn/manual/docs#/140 只需看3.1
本文将不再累述

1. 方法介绍(摘自 虹软安卓接入详情)

1.activeOnline

功能描述

用于在线激活SDK。

方法

int activeOnline(Context context,  String appId, String sdkKey)

初次使用SDK时需要对SDK先进行激活,激活后无需重复调用;
调用此接口时必须为联网状态,激活成功后即可离线使用;

参数说明

参数 类型 描述
context in 上下文信息
appId in 官网获取的APP_ID
sdkKey in 官网获取的SDK_KEY

返回值

成功返回ErrorInfo.MOKErrorInfo.MERR_ASF_ALREADY_ACTIVATED,失败详见 错误码列表。

2.init

功能描述

初始化引擎。

该接口至关重要,清楚的了解该接口参数的意义,可以避免一些问题以及对项目的设计都有一定的帮助。

方法

int init(
    Context context,
    DetectMode detectMode,
    DetectFaceOrientPriority detectFaceOrientPriority,
    int detectFaceScaleVal,
    int detectFaceMaxNum,
    int combinedMask
)

参数说明

参数 类型 描述
context in 上下文信息
detectMode in VIDEO模式:处理连续帧的图像数据 IMAGE模式:处理单张的图像数据
detectFaceOrientPriority in 人脸检测角度,推荐单一角度检测;
detectFaceScaleVal in 识别的最小人脸比例(图片长边与人脸框长边的比值) VIDEO模式取值范围[2,32],推荐值为16 IMAGE模式取值范围[2,32],推荐值为32
detectFaceMaxNum in 最大需要检测的人脸个数,取值范围[1,50]
combinedMask in 需要启用的功能组合,可多选

3.detectFaces(传入分离的图像信息数据)

方法

int detectFaces(
    byte[] data,
    int width,
    int height,
    int format,
    List faceInfoList
)

参数说明

参数 类型 描述
data in 图像数据
width in 图像宽度,为4的倍数
height in 图像高度,在NV21格式下要求为2的倍数; BGR24/GRAY/DEPTH_U16格式无限制;
format in 图像的颜色格式
faceInfoList out 检测到的人脸信息

返回值

成功返回ErrorInfo.MOK,失败详见 错误码列表。

detectFaceMaxNum 参数的设置,对能否检测到人脸以及检测到几张人脸都有决定性的作用。

4.process(传入分离的图像信息数据)

方法

int process(
    byte[] data,
    int width,
    int height,
    int format,
    List faceInfoList,
    int combinedMask
)

参数说明

参数 类型 描述
data in 图像数据
width in 图片宽度,为4的倍数
height in 图片高度,在NV21格式下要求为2的倍数 BGR24格式无限制
format in 支持NV21/BGR24
faceInfoList in 人脸信息列表
combinedMask in 检测的属性(ASF_AGE、ASF_GENDER、 ASF_FACE3DANGLE、ASF_LIVENESS),支持多选 检测的属性须在引擎初始化接口的combinedMask参数中启用

重要参数说明

  • combinedMask

process接口中支持检测ASF_AGEASF_GENDERASF_FACE3DANGLEASF_LIVENESS四种属性,但是想检测这些属性,必须在初始化引擎接口中对想要检测的属性进行初始化。

关于初始化接口中combinedMaskprocess接口中combinedMask参数之间的关系,举例进行详细说明,如下图所示:

  1. process接口中combinedMask支持传入的属性有ASF_AGEASF_GENDERASF_FACE3DANGLEASF_LIVENESS
  2. 初始化中传入了ASF_FACE_DETECTASF_FACERECOGNITIONASF_AGEASF_LIVENESS属性。
  3. process可传入属性组合只有ASF_AGEASF_LIVENESSASF_AGE | ASF_LIVENESS
combinedMask

返回值

成功返回ErrorInfo.MOK,失败详见 错误码列表。

5.extractFaceFeature(传入分离的图像信息数据)

方法

int extractFaceFeature(
    byte[] data,
    int width,
    int height,
    int format,
    FaceInfo faceInfo,
    FaceFeature feature
)

参数说明

参数 类型 描述
data in 图像数据
width in 图片宽度,为4的倍数
height in 图片高度,在NV21格式下要求为2的倍数; BGR24/GRAY/DEPTH_U16格式无限制;
format in 图像的颜色格式
faceInfo in 人脸信息(人脸框、人脸角度)
feature out 提取到的人脸特征信息

返回值

成功返回ErrorInfo.MOK,失败详见 错误码列表。

6.compareFaceFeature(可选择比对模型)

方法

int compareFaceFeature (
    FaceFeature feature1,
    FaceFeature feature2,
    CompareModel compareModel,
    FaceSimilar faceSimilar
)

参数说明

参数 类型 描述
feature1 in 人脸特征
feature2 in 人脸特征
compareModel in 比对模型
faceSimilar out 比对相似度

返回值

成功返回ErrorInfo.MOK,失败详见 错误码列表。

使用 RxArcFace

  • clone项目到本地 https://github.com/ZYF99/RxArcFace.git
  • 在需要使用的项目中 引入RxArcFace的Module


  • 选中刚才克隆下的项目文件夹中的RxArcFaceModule


  • 在自己项目的app的build.gradle中添加依赖
implementation project(path: ':RxArcFacelibrary')

添加权限





将需要匹配的数据类实现 IFaceDetect 接口

data class Person(
    val id: Long? = null,
    val name: String? = null,
    val avatar: String? = null, //添加avatar属性
    var faceCode: String? = null //添加faceCode可变属性
) : IFaceDetect {
    override fun getFaceCodeJson(): String? {
        return faceCode
    }

    override fun getAvatarUrl(): String? {
        return avatar
    }

    override fun bindFaceCode(faceCodeJson: String?) {
        faceCode = faceCodeJson
    }
}

也许你会问为什么我还需要自己添加faceCode属性和avatar属性呢?

其实并不是需要你自己去添加,往往我们在接入人脸识别功能时,我们早就有了自己的数据类,这跟数据类很可能是后端返回给我们的,而我们有时候很难决定后端会给我们什么样的数据, faceCodeavatar 只是说我们的数据类必须有这两种东西(一个人脸特征,一个头像),它们可以是你之前就有的,也可以是你后来添加的,假如后端本身就返回给我们一个 属性作为人脸特征,那么我们直接在 getFaceCodeJson 返回它就好,avatar同理。

摄像头采集图像

    private var camera: Camera? = null
    
    //初始化相机、surfaceView
    private fun initCameraOrigin(surfaceView: SurfaceView) {
        surfaceView.holder.addCallback(object : SurfaceHolder.Callback {
            override fun surfaceCreated(holder: SurfaceHolder) {
                //surface创建时执行
                if (camera == null) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                        camera = openCamera(this@MainActivity) { data, camera, resWidth, resHeight ->
                                if (data != null && data.size > 1) {
                                    //TODO 人脸匹配
                                }
                            }
                    }
                }
                //调整摄像头方向
                camera?.let { setCameraDisplayOrientation(this@MainActivity, it) }

                //开始预览
                holder.let { camera?.startPreview(it) }
            }

            override fun surfaceChanged(
                holder: SurfaceHolder,
                format: Int,
                width: Int,
                height: Int
            ) {

            }

            override fun surfaceDestroyed(holder: SurfaceHolder) {
                camera.releaseCamera()
                camera = null
            }
        })
    }
    
    override fun onPause() {
        camera?.setPreviewCallback(null)
        camera.releaseCamera()//释放相机资源
        camera = null
        super.onPause()
    }

    override fun onDestroy() {
        camera?.setPreviewCallback(null)
        camera.releaseCamera()//释放相机资源
        camera = null
        super.onDestroy()
    }

使用人脸识别匹配

if (data != null && data.size > 1) {
    matchHumanFaceListByArcSoft(
        data = data,
        width = resWidth,
        height = resHeight,
        humanList = listOfPerson,
        doOnMatchedHuman = { matchedPerson ->
            Toast.makeText(
                this@MainActivity,
                "匹配到${matchedPerson.name}",
                Toast.LENGTH_SHORT
            ).show()
            isFaceDetecting = false
        },
        doOnMatchMissing = {
            Toast.makeText(
                this@MainActivity,
                "没匹配到人,正在录入",
                Toast.LENGTH_SHORT
            ).show()

            //为一个新的人绑定人脸数据
            bindFaceCodeByByteArray(
                Person(name = "帅哥"),
                data,
                resWidth,
                resHeight
            ).doOnSuccess {
                //往当前列表加入新注册的人
                listOfPerson.add(it)
                Toast.makeText(
                    this@MainActivity,
                    "录入成功",
                    Toast.LENGTH_SHORT
                ).show()
                isFaceDetecting = false
            }.subscribe()

        },
        doFinally = { }
    )
}

完整的Activity代码

package com.lxh.rxarcface

import android.hardware.Camera
import android.os.Build
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.SurfaceHolder
import android.view.SurfaceView
import android.widget.Toast
import com.lxh.rxarcfacelibrary.bindFaceCodeByByteArray
import com.lxh.rxarcfacelibrary.initArcSoftEngine
import com.lxh.rxarcfacelibrary.isFaceDetecting
import com.lxh.rxarcfacelibrary.matchHumanFaceListByArcSoft

class MainActivity : AppCompatActivity() {

    private var camera: Camera? = null
    private var listOfPerson: MutableList = mutableListOf()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        
        //初始化人脸识别引擎
        initArcSoftEngine(
            this,
            "输入官网申请的appid",
            "输入官网申请的"
        )

        //初始化摄像头
        initCameraOrigin(findViewById(R.id.surface_view))
    }

    //初始化相机、surfaceView
    private fun initCameraOrigin(surfaceView: SurfaceView) {
        surfaceView.holder.addCallback(object : SurfaceHolder.Callback {
            override fun surfaceCreated(holder: SurfaceHolder) {
                //surface创建时执行
                if (camera == null) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                        camera =
                            openCamera(this@MainActivity) { data, camera, resWidth, resHeight ->
                                if (data != null && data.size > 1) {
                                    matchHumanFaceListByArcSoft(
                                        data = data,
                                        width = resWidth,
                                        height = resHeight,
                                        humanList = listOfPerson,
                                        doOnMatchedHuman = { matchedPerson ->
                                            Toast.makeText(
                                                this@MainActivity,
                                                "匹配到${matchedPerson.name}",
                                                Toast.LENGTH_SHORT
                                            ).show()
                                            isFaceDetecting = false
                                        },
                                        doOnMatchMissing = {
                                            Toast.makeText(
                                                this@MainActivity,
                                                "没匹配到人,正在录入",
                                                Toast.LENGTH_SHORT
                                            ).show()

                                            //为一个新的人绑定人脸数据
                                            bindFaceCodeByByteArray(
                                                Person(name = "帅哥"),
                                                data,
                                                resWidth,
                                                resHeight
                                            ).doOnSuccess {
                                                //往当前列表加入新注册的人
                                                listOfPerson.add(it)
                                                Toast.makeText(
                                                    this@MainActivity,
                                                    "录入成功",
                                                    Toast.LENGTH_SHORT
                                                ).show()
                                                isFaceDetecting = false
                                            }.subscribe()

                                        },
                                        doFinally = { }
                                    )
                                }
                            }
                    }
                }
                //调整摄像头方向
                camera?.let { setCameraDisplayOrientation(this@MainActivity, it) }

                //开始预览
                holder.let { camera?.startPreview(it) }
            }

            override fun surfaceChanged(
                holder: SurfaceHolder,
                format: Int,
                width: Int,
                height: Int
            ) {

            }

            override fun surfaceDestroyed(holder: SurfaceHolder) {
                camera.releaseCamera()
                camera = null
            }
        })
    }

    override fun onPause() {
        camera?.setPreviewCallback(null)
        camera.releaseCamera()//释放相机资源
        camera = null
        super.onPause()
    }

    override fun onDestroy() {
        camera?.setPreviewCallback(null)
        camera.releaseCamera()//释放相机资源
        camera = null
        super.onDestroy()
    }

}

注意:Demo没有检查相机权限,自行在设置去打开权限或者自己添加权限检测

封装介绍

直接SDK的使用请参考官方Demo,在注册SDK服务时下载即可。这里不介绍Demo使用,如果需要直接参考官方写的Demo即可,另外的,用我最后的封装会比直接使用官方SDK简单得多

1.引入依赖

https://ai.arcsoft.com.cn/manual/docs#/140: 请确保已按照3.1引入虹软依赖配置

    //RxJava2
    implementation "io.reactivex.rxjava2:rxjava:2.2.13"
    implementation "io.reactivex.rxjava2:rxkotlin:2.3.0"

    //Json Serializer(工具类中使用到了Moshi作为序列化工具,可自行替换为其他工具)
    implementation("com.squareup.moshi:moshi-kotlin:1.9.2")
    kapt("com.squareup.moshi:moshi-kotlin-codegen:1.9.2")

    //Glide(工具类中使用到了Glide作为序列化工具,可自行替换为其他工具)
    implementation "com.github.bumptech.glide:glide:4.10.0"
    
    //RxJava2
    implementation "io.reactivex.rxjava2:rxjava:2.2.13"
    implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
    implementation "io.reactivex.rxjava2:rxkotlin:2.3.0"
    

2.实现工具类

定义全局变量

//(虹软)判断为同一人的阈值,大于此值即可判断为同一人
const val ARC_SOFT_VALUE_MATCHED = 0.8f

private var context: Context? = null

//虹软人脸初始化分析引擎(用于整个APP种需要解析人脸图片为虹软人脸特征数据所使用的引擎)
//使用两个引擎的原因是:我们从网络或者自己的服务器获取的人脸照片人脸方向一定正常,但Android本身Camera获取到的图像旋转角度不定,初始化时又必须给一个旋转角度
private val faceDetectEngine = FaceEngine()

//虹软人脸识别引擎(用于人脸识别使用的引擎)
private val faceEngine = FaceEngine()

//上次检测人脸的时间戳
var lastFaceDetectingTime = 0L

//是否正在检测(很重要,若同一时间多个图片交给SDK检测,C++底层将会内存溢出)
var isFaceDetecting = false

初始化

/**
 * (虹软)初始化人脸识别引擎
 * */
 fun initArcSoftEngine(
    contextTemp: Context,
    arcAppId: String, //在官网申请的 APPID
    arcSdkKey: String //在官网申请的 APPKEY
) {
    context = contextTemp
    val activeCode = FaceEngine.activeOnline(
        context,
        arcAppId,
        arcSdkKey
    )
    Log.d("激活虹软,结果码:", activeCode.toString())
    
    //人脸识别引擎
    val faceEngineCode = faceEngine.init(
        context,
        DetectMode.ASF_DETECT_MODE_IMAGE, //检测模式,可选 ASF_DETECT_MODE_VIDEO、ASF_DETECT_MODE_IMAGE
        DetectFaceOrientPriority.ASF_OP_270_ONLY, //检测角度,不清楚角度可将模式改为VIDEO模式并将角度设置为 ASF_OP_ALL_OUT(全角度检测)
        16,
        6,
        FaceEngine.ASF_FACE_RECOGNITION or FaceEngine.ASF_AGE or FaceEngine.ASF_FACE_DETECT or FaceEngine.ASF_GENDER or FaceEngine.ASF_FACE3DANGLE
    )

    //人脸图片分析引擎
    faceDetectEngine.init(
        context,
        DetectMode.ASF_DETECT_MODE_VIDEO,
        DetectFaceOrientPriority.ASF_OP_ALL_OUT,
        16,
        6,
        FaceEngine.ASF_FACE_RECOGNITION or FaceEngine.ASF_AGE or FaceEngine.ASF_FACE_DETECT or FaceEngine.ASF_GENDER or FaceEngine.ASF_FACE3DANGLE
    )

    Log.d("FaceEngine init", "initEngine: init $faceEngineCode")
    when (faceEngineCode) {
        ErrorInfo.MOK,
        ErrorInfo.MERR_ASF_ALREADY_ACTIVATED -> {
        }
        else -> showToast("初始化虹软人脸识别错误,Code${faceEngineCode}")
    }
}

接下来我们需要定义一个规范,通过上面的API介绍我们知道识别其实是通过 compareFaceFeature()方法比较两个 FaceFeature对象,所以我们需要比较的数据类比如 一个 data class Person 就需要里面有一个类型为 FaceFeature 属性。但我们可能拥有多个这样的 class ,比如 StudentTeacher,他们都是毫无关系的数据类,于是我用一个接口来要求每个需要人脸识别的类去实现。

定义识别实体类的接口

/**
 * 作为人脸识别数据类必须实现的接口
 * */
interface IFaceDetect {
    //获取特征码Json
    fun getFaceCodeJson(): String?

    //获取头像URL
    fun getAvatarUrl(): String?

    //绑定特征码
    fun bindFaceCode(faceCodeJson: String?)
}

通过图片byte数组获取FaceFeature

/**
 * (虹软)通过人员人脸图片byteArray,为人员绑定上特征码
 * */
@Synchronized
fun  bindFaceCodeByByteArray(
    person: T,
    imageByteArray: ByteArray,
    imageWidth: Int,
    imageHeight: Int
): Single {
    return getArcFaceCodeByImageData(
        imageByteArray,
        imageWidth,
        imageHeight
    ).flatMap {
        Single.just(person.apply {
            bindFaceCode(it)
        })
    }.subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
}

/**
 * 通过图片数据加载为ArcFaceCode
 * */
private fun getArcFaceCodeByImageData(
    imageData: ByteArray,
    imageWidth: Int,
    imageHeight: Int
): Single {
    return Single.create { emitter ->
        val detectStartTime = System.currentTimeMillis()
        //人脸列表
        val faceInfoList: List = mutableListOf()

        //⼈脸检测
        val detectCode = faceDetectEngine.detectFaces(
            imageData,
            imageWidth,
            imageHeight,
            FaceEngine.CP_PAF_NV21,
            faceInfoList
        )
        if (detectCode == 0) {
            //人脸剖析
            val faceProcessCode = faceDetectEngine.process(
                imageData,
                imageWidth,
                imageHeight,
                FaceEngine.CP_PAF_NV21,
                faceInfoList,
                FaceEngine.ASF_AGE or FaceEngine.ASF_GENDER or FaceEngine.ASF_FACE3DANGLE
            )
            //剖析成功
            if (faceProcessCode == ErrorInfo.MOK && faceInfoList.isNotEmpty()) {
                //识别到的人脸特征
                val currentFaceFeature = FaceFeature()
                //人脸特征分析
                val res = faceDetectEngine.extractFaceFeature(
                    imageData,
                    imageWidth,
                    imageHeight,
                    FaceEngine.CP_PAF_NV21,
                    faceInfoList[0],
                    currentFaceFeature
                )
                //人脸特征分析成功
                if (res == ErrorInfo.MOK) {
                    Log.d(
                        "!!人脸转换耗时",
                        "${System.currentTimeMillis() - detectStartTime}"
                    )
                    Schedulers.io().scheduleDirect {
                        emitter.onSuccess(globalMoshi.toJson(currentFaceFeature))
                    }
                }
            } else {
                Log.d("ARCFACE", "face process finished , code is $faceProcessCode")
                Schedulers.io().scheduleDirect {
                    emitter.onSuccess("")
                }
            }

        } else {
            Log.d(
                "ARCFACE",
                "face detection finished, code is " + detectCode + ", face num is " + faceInfoList.size
            )
            Schedulers.io().scheduleDirect {
                emitter.onSuccess("")
            }
        }
    }
}

通过图片url获取FaceFeature

/**
 * (虹软)通过人员人脸图片url,获取带特征码人员列表
 * */
@Synchronized
fun  detectPersonAvatarAndBindFaceFeatureCodeByArcSoft(
    personListTemp: List?
): Single> {
    return Observable.fromIterable(personListTemp)
        .flatMapSingle { person ->
            getArcFaceCodeByPicUrl(person.getAvatarUrl())
                .map { arcFaceCodeJson ->
                    person.bindFaceCode(arcFaceCodeJson)
                    person
                }
        }
        .toList()
        .subscribeOn(Schedulers.io())
}

/**
 * 通过照片加载为ArcFaceCode
 * */
private fun getArcFaceCodeByPicUrl(
    picUrl: String?
): Single {
    return Single.create { emitter ->
        Glide.with(context!!)
            .asBitmap()
            .load(picUrl)
            .listener(object : RequestListener {
                override fun onLoadFailed(
                    e: GlideException?,
                    model: Any?,
                    target: Target?,
                    isFirstResource: Boolean
                ): Boolean {
                    emitter.onSuccess("")
                    return false
                }

                override fun onResourceReady(
                    resource: Bitmap?,
                    model: Any?,
                    target: Target?,
                    dataSource: DataSource?,
                    isFirstResource: Boolean
                ): Boolean {
                    return false
                }
            })
            .into(object : SimpleTarget() {
                @Synchronized
                override fun onResourceReady(
                    bitMap: Bitmap,
                    transition: Transition?
                ) {
                    val detectStartTime = System.currentTimeMillis()
                    //人脸列表
                    val faceInfoList: List = mutableListOf()
                    val faceByteArray = getPixelsBGR(bitMap)
                    //⼈脸检测
                    val detectCode = faceDetectEngine.detectFaces(
                        faceByteArray,
                        bitMap.width,
                        bitMap.height,
                        FaceEngine.CP_PAF_BGR24,
                        faceInfoList
                    )
                    if (detectCode == 0) {
                        //人脸剖析
                        val faceProcessCode = faceDetectEngine.process(
                            faceByteArray,
                            bitMap.width,
                            bitMap.height,
                            FaceEngine.CP_PAF_BGR24,
                            faceInfoList,
                            FaceEngine.ASF_AGE or FaceEngine.ASF_GENDER or FaceEngine.ASF_FACE3DANGLE
                        )
                        //剖析成功
                        if (faceProcessCode == ErrorInfo.MOK && faceInfoList.isNotEmpty()) {
                            //识别到的人脸特征
                            val currentFaceFeature = FaceFeature()
                            //人脸特征分析
                            val res = faceDetectEngine.extractFaceFeature(
                                faceByteArray,
                                bitMap.width,
                                bitMap.height,
                                FaceEngine.CP_PAF_BGR24,
                                faceInfoList[0],
                                currentFaceFeature
                            )
                            //人脸特征分析成功
                            if (res == ErrorInfo.MOK) {
                                Log.d(
                                    "!!人脸转换耗时",
                                    "${System.currentTimeMillis() - detectStartTime}"
                                )
                                Schedulers.io().scheduleDirect {
                                    emitter.onSuccess(globalMoshi.toJson(currentFaceFeature))
                                }
                            }
                        } else {
                            Log.d("ARCFACE", "face process finished , code is $faceProcessCode")
                            Schedulers.io().scheduleDirect {
                                emitter.onSuccess("")
                            }
                        }

                    } else {
                        Log.d(
                            "ARCFACE",
                            "face detection finished, code is " + detectCode + ", face num is " + faceInfoList.size
                        )
                        Schedulers.io().scheduleDirect {
                            emitter.onSuccess("")
                        }
                    }
                }
            })
    }
}

为实体数据绑定人脸特征数据

/**
 * (虹软)通过人员人脸图片,获取带特征码人员列表
 * */
@Synchronized
fun  detectPersonAvatarAndBindFaceFeatureCodeByArcSoft(
    personListTemp: List?
): Single> {
    return Observable.fromIterable(personListTemp)
        .flatMapSingle { person ->
            getArcFaceCodeByPicUrl(person.getAvatarUrl())
                .map { arcFaceCodeJson ->
                    person.bindFaceCode(arcFaceCodeJson)
                    person
                }
        }
        .toList()
        .subscribeOn(Schedulers.io())
}

从列表匹配出一个人

有了规范,我们就可以开始识别了,先写一个从列表识别出一个人的方法

/**
 * (虹软)通过人脸图片识别匹配列表里的人类
 * */
 

/**
 * (虹软)通过人脸图片识别匹配列表里的人类
 * */
@Synchronized
fun  matchHumanFaceListByArcSoft(
    data: ByteArray,
    width: Int,
    height: Int,
    previewWidth: Int? = null,
    previewHeight: Int? = null,
    humanList: List,
    doOnMatchedHuman: (T) -> Unit,
    doOnMatchMissing: (() -> Unit)? = null,
    doFinally: (() -> Unit)? = null
) {
    if (isFaceDetecting) return

    synchronized(faceEngine) {
        //Log.d(TAG_ARC_FACE, "当前线程:${Thread.currentThread().name}")

        //正在检测
        isFaceDetecting = true

        //上次检测时间
        lastFaceDetectingTime = System.currentTimeMillis()

        //人脸列表
        val faceInfoList: List = mutableListOf()

        //⼈脸检测
        val detectCode = faceEngine.detectFaces(
            data,
            width,
            height,
            FaceEngine.CP_PAF_NV21,
            faceInfoList
        )

        if (detectCode != 0 || faceInfoList.isEmpty()) {
            Log.d(TAG_ARC_FACE, "face detection finished, code is " + detectCode + ", face num is " + faceInfoList.size)
            doFinally?.invoke()
            isFaceDetecting = false
            return
        }

        //人脸剖析
        val faceProcessCode = faceEngine.process(
            data,
            width,
            height,
            FaceEngine.CP_PAF_NV21,
            faceInfoList,
            FaceEngine.ASF_AGE or FaceEngine.ASF_GENDER or FaceEngine.ASF_FACE3DANGLE
        )

        //剖析失败
        if (faceProcessCode != ErrorInfo.MOK) {
            Log.d(TAG_ARC_FACE, "face process finished , code is $faceProcessCode")
            doFinally?.invoke()
            isFaceDetecting = false
            return
        }

        //previewWidth和previewHeight不为空表示需要人脸在画面中间
        val needAvatarInViewCenter =
            if (faceInfoList.isNotEmpty()) {
                previewWidth != null
                        && previewHeight != null
                        && isAvatarInViewCenter(faceInfoList[0].rect, previewWidth, previewHeight)
            } else false

        //previewWidth和previewHeight为空表示不需要人脸在画面中间
        val doNotNeedAvatarInViewCenter = previewWidth == null && previewHeight == null

        when {
            (faceInfoList.isNotEmpty() && needAvatarInViewCenter)
                    || (faceInfoList.isNotEmpty() && doNotNeedAvatarInViewCenter) -> {
            }
            else -> {//无人脸,退出匹配
                doFinally?.invoke()
                isFaceDetecting = false
                return
            }
        }

        //识别到的人脸特征
        val currentFaceFeature = FaceFeature()

        //人脸特征分析
        val res = faceEngine.extractFaceFeature(
            data,
            width,
            height,
            FaceEngine.CP_PAF_NV21,
            faceInfoList[0],
            currentFaceFeature
        )

        //人脸特征分析失败
        if (res != ErrorInfo.MOK) {
            doFinally?.invoke()
            isFaceDetecting = false
            return
        }

        //进行遍历匹配
        val matchedMeetingPerson = humanList.find {
            val faceSimilar = FaceSimilar()
            val startDetectTime = System.currentTimeMillis()
            if (it.getFaceCodeJson() == null || it.getFaceCodeJson()!!.isEmpty()) {
                return@find false
            }
            val compareResult =
                faceEngine.compareFaceFeature(
                    globalMoshi.fromJson(it.getFaceCodeJson()),
                    currentFaceFeature,
                    faceSimilar
                )
            Log.d(TAG_ARC_FACE, "单人匹配耗时: ${System.currentTimeMillis() - startDetectTime}")
            if (compareResult == ErrorInfo.MOK) {
                Log.d("相似度", faceSimilar.score.toString())
                faceSimilar.score > ARC_SOFT_VALUE_MATCHED
            } else {
                Log.d(TAG_ARC_FACE, "对比发生错误: $compareResult")
                false
            }
        }
        if (matchedMeetingPerson == null) {
            //匹配到的人为空
            doOnMatchMissing?.invoke()
        } else {
            //匹配到的人
            doOnMatchedHuman(matchedMeetingPerson)
        }
    }

}

匹配单个人

/**
 * (虹软)通过一个人脸图片识别匹配是否为某个人类
 * */
@Synchronized
fun  matchHumanFaceSoloByArcSoft(
    data: ByteArray,
    width: Int,
    height: Int,
    previewWidth: Int? = null,
    previewHeight: Int? = null,
    human: T,
    doOnMatched: (T) -> Unit,
    doOnMatchMissing: (() -> Unit)? = null,
    doFinally: (() -> Unit)? = null
) {
    matchHumanFaceListByArcSoft(
        data = data,
        width = width,
        height = height,
        previewWidth = previewWidth,
        previewHeight = previewHeight,
        humanList = listOf(human),
        doOnMatchedHuman = doOnMatched,
        doOnMatchMissing = doOnMatchMissing,
        doFinally = doFinally
    )
}

判断人脸是否在预览View的中间

/**
 * 判断人脸是否在View的中间
 * */
fun isAvatarInViewCenter(rect: Rect, previewWidth: Int, previewHeight: Int): Boolean {
    try {
        val minSX = previewHeight / 10f
        val minZY = kotlin.math.abs(previewWidth - previewHeight) / 2 + minSX

        val isLeft = kotlin.math.abs(rect.left) > minZY
        val isTop = kotlin.math.abs(rect.top) > minSX
        val isRight = kotlin.math.abs(rect.left) + rect.width() < (previewWidth - minZY)
        val isBottom = kotlin.math.abs(rect.top) + rect.height() < (previewHeight - minSX)
        if (isLeft && isTop && isRight && isBottom) return true
    } catch (e: Exception) {
        Log.e("ARCFACE", e.localizedMessage)
    }
    return false
}

销毁引擎

/**
 * 销毁人脸检测对象
 * */
fun unInitArcFaceEngine() {
    faceEngine.unInit()
}

/**
 * 销毁图片分析对象
 * */
fun unInitArcFaceDetectEngine() {
    faceDetectEngine.unInit()
}

获取BGR像素的工具

/**
 * 提取图像中的BGR像素
 * @param image
 * @return
 */
fun getPixelsBGR(image: Bitmap): ByteArray? {
    // calculate how many bytes our image consists of
    val bytes = image.byteCount
    val buffer = ByteBuffer.allocate(bytes) // Create a new buffer
    image.copyPixelsToBuffer(buffer) // Move the byte data to the buffer
    val temp = buffer.array() // Get the underlying array containing the data.
    val pixels = ByteArray(temp.size / 4 * 3) // Allocate for BGR

    // Copy pixels into place
    for (i in 0 until temp.size / 4) {
        pixels[i * 3] = temp[i * 4 + 2] //B
        pixels[i * 3 + 1] = temp[i * 4 + 1] //G
        pixels[i * 3 + 2] = temp[i * 4] //R
    }
    return pixels
}

关于上面用到的序列化,我将序列化工具的代码也贴出来吧,方便大家直接copy使用

序列化的扩展工具(Moshi的扩展方法,ModelUtil)

import com.squareup.moshi.JsonAdapter
import com.squareup.moshi.Moshi
import com.squareup.moshi.Types
import java.lang.reflect.Type

inline fun  String?.fromJson(moshi: Moshi = globalMoshi): T? =
    this?.let { ModelUtil.fromJson(this, T::class.java, moshi = moshi) }

inline fun  T?.toJson(moshi: Moshi = globalMoshi): String =
    ModelUtil.toJson(this, T::class.java, moshi = moshi)

inline fun  Moshi.fromJson(json: String?): T? =
    json?.let { ModelUtil.fromJson(json, T::class.java, moshi = this) }

inline fun  Moshi.toJson(t: T?): String =
    ModelUtil.toJson(t, T::class.java, moshi = this)

inline fun  List.listToJson(): String =
    ModelUtil.listToJson(this, T::class.java)

inline fun  String.jsonToList(): List? =
    ModelUtil.jsonToList(this, T::class.java)

object ModelUtil {

    inline fun  copyModel(source: S): T? {
        return fromJson(
            toJson(
                any = source,
                classOfT = S::class.java
            ), T::class.java
        )
    }

    fun  toJson(any: T?, classOfT: Class, moshi: Moshi = globalMoshi): String {
        return moshi.adapter(classOfT).toJson(any)
    }

    fun  fromJson(json: String, classOfT: Class, moshi: Moshi = globalMoshi): T? {
        return moshi.adapter(classOfT).lenient().fromJson(json)
    }

    fun  fromJson(json: String, typeOfT: Type, moshi: Moshi = globalMoshi): T? {
        return moshi.adapter(typeOfT).fromJson(json)
    }

    fun  listToJson(list: List?, classOfT: Class, moshi: Moshi = globalMoshi): String {
        val type = Types.newParameterizedType(List::class.java, classOfT)
        val adapter: JsonAdapter> = moshi.adapter(type)
        return adapter.toJson(list)
    }

    fun  jsonToList(json: String, classOfT: Class, moshi: Moshi = globalMoshi): List? {
        val type = Types.newParameterizedType(List::class.java, classOfT)
        val adapter = moshi.adapter>(type)
        return adapter.fromJson(json)
    }
}

相机的扩展工具

import android.app.Activity
import android.content.Context
import android.content.res.Configuration
import android.graphics.ImageFormat
import android.hardware.Camera
import android.hardware.camera2.CameraManager
import android.os.Build
import android.util.Log
import android.view.Surface
import android.view.SurfaceHolder
import androidx.annotation.RequiresApi
import kotlin.math.abs

private var resultWidth = 0
private var resultHeight = 0

var cameraId:Int = 0

/**
 * 打开相机
 * */
@RequiresApi(Build.VERSION_CODES.LOLLIPOP)
fun openCamera(
    context: Context,
    width: Int = 800,
    height: Int = 600,
    doOnPreviewCallback: (ByteArray?, Camera?, Int, Int) -> Unit
): Camera {
    Camera.getNumberOfCameras()
    (context.getSystemService(Context.CAMERA_SERVICE) as CameraManager).cameraIdList
    cameraId = findFrontFacingCameraID()
    val c = Camera.open(cameraId)
    initParameters(context, c, width, height)
    c.setPreviewCallback { data, camera ->
        doOnPreviewCallback(
            data,
            camera,
            resultWidth,
            resultHeight
        )
    }
    return c
}

private fun findFrontFacingCameraID(): Int {
    var cameraId = -1
    // Search for the back facing camera
    val numberOfCameras = Camera.getNumberOfCameras()
    for (i in 0 until numberOfCameras) {
        val info = Camera.CameraInfo()
        Camera.getCameraInfo(i, info)
        if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
            Log.d("CAMERA UTIL", "Camera found ,ID is $i")
            cameraId = i
            break
        }
    }
    return cameraId
}


/**
 * 设置相机参数
 * */
fun initParameters(
    context: Context,
    camera: Camera,
    width: Int,
    height: Int
) {
    //获取Parameters对象
    val parameters = camera.parameters
    val size = getOptimalSize(context, parameters.supportedPreviewSizes, width, height)
    parameters?.setPictureSize(size?.width ?: 0, size?.height ?: 0)
    parameters?.setPreviewSize(size?.width ?: 0, size?.height ?: 0)
    resultWidth = size?.width ?: 0
    resultHeight = size?.height ?: 0
    //设置预览格式getOptimalSize
    parameters?.previewFormat = ImageFormat.NV21
    //对焦
    parameters?.focusMode = Camera.Parameters.FOCUS_MODE_FIXED
    //给相机设置参数
    camera.parameters = parameters
}

/**
 * 释放相机资源
 * */
fun Camera?.releaseCamera() {
    if (this != null) {
        //停止预览
        stopPreview()
        setPreviewCallback(null)
        //释放相机资源
        release()
    }
}

/**
 * 获取相机旋转角度
 * */
fun getDisplayRotation(activity: Activity): Int {
    val rotation = activity.windowManager.defaultDisplay
        .rotation
    when (rotation) {
        Surface.ROTATION_0 -> return 0
        Surface.ROTATION_90 -> return 90
        Surface.ROTATION_180 -> return 180
        Surface.ROTATION_270 -> return 270
    }
    return 90
}

/**
 * 设置预览展示角度
 * */
fun setCameraDisplayOrientation(
    activity: Activity,
    camera: Camera
) {
    // See android.hardware.Camera.setCameraDisplayOrientation for
    // documentation.
    val info = Camera.CameraInfo()
    Camera.getCameraInfo(cameraId, info)
    val degrees = getDisplayRotation(activity)
    var result: Int
    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
        result = (info.orientation + degrees) % 360
        result = (360 - result) % 360 // compensate the mirror
    } else { // back-facing
        result = (info.orientation - degrees + 360) % 360
    }
    camera.setDisplayOrientation(result)
}

/**
 * 开始相机预览
 * */
fun Camera.startPreview(surfaceHolder: SurfaceHolder) {
    //根据所传入的SurfaceHolder对象来设置实时预览
    setPreviewDisplay(surfaceHolder)
    startPreview()
}


/**
 * 选取与width、height比例最接近的、设置支持的size
 * @param context
 * @param sizes 设置支持的size序列
 * @param w 相机预览视图的width
 * @param h 相机预览视图的height
 * @return
 */
private fun getOptimalSize(
    context: Context,
    sizes: List,
    w: Int,
    h: Int
): Camera.Size? {
    val ASPECT_TOLERANCE = 0.1 //阈值,用于选取最优
    var targetRatio = -1.0
    val orientation = context.resources.configuration.orientation
    //保证targetRatio始终大于1,因为size.width/size.height始终大于1
    if (orientation == Configuration.ORIENTATION_PORTRAIT) {
        targetRatio = h.toDouble() / w
    } else if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
        targetRatio = w.toDouble() / h
    }
    var optimalSize: Camera.Size? = null
    var minDiff = Double.MAX_VALUE
    val targetHeight = w.coerceAtMost(h)
    for (size in sizes) {
        val ratio = size.width.toDouble() / size.height
        //若大于了阈值,则继续筛选
        if (abs(ratio - targetRatio) > ASPECT_TOLERANCE) {
            continue
        }
        if (abs(size.height - targetHeight) < minDiff) {
            optimalSize = size
            minDiff = abs(size.height - targetHeight).toDouble()
        }
    }
    //若通过比例没有获得最优,则通过最小差值获取最优,保证至少能得到值
    if (optimalSize == null) {
        minDiff = Double.MAX_VALUE
        for (size in sizes) {
            if (abs(size.height - targetHeight) < minDiff) {
                optimalSize = size
                minDiff = abs(size.height - targetHeight).toDouble()
            }
        }
    }
    return optimalSize
}

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