如何在OpenHarmony上使用SeetaFace2人脸识别库()

简介 相信大部分同学们都已了解或接触过OpenAtom OpenHarmony(以下简称“OpenHarmony”)了,但你一定没在OpenHarmony上实现过人脸识别功能,跟着本文带你快速在OpenHarmony标准设备上基于SeetaFace2和OpenCV实现人脸识别。
项目效果 本项目实现了导入人脸模型、人脸框选和人脸识别三大功能,操作流程如下:

  1. 录入页面点击右下角按钮,跳转拍摄页面进行拍照;
  2. 选择一张或多张人脸作为训练模型,并设置对应的名字;
  3. 选择一张未录入的人脸图片,点击框选按钮实现人脸图片框选功能;
  4. 最后点击识别,应用会对当前图片进行匹配,最终在界面中显示识别结果。
    快速上手设备端开发
    设备端通过OpenCV对图像进行处理并通过Seetaface2对图形数据进行人脸头像的识别,最终输出对应的NAPI接口提供给应用端调用。因此设备端开发主要涉及到OpenCV和Seetaface2的移植以及NAPI接口的开发。
    OpenCV库移植
    OpenCV是一个功能非常强大的开源计算机视觉库。此库已由知识体系工作组移植到了OpenHarmony中,后期还会将此库合入到主仓。在此库上主仓之前,我们只需要以下几个步骤就可以实现OpenCV的移植使用。
    1. 通过以下命令下载已经移植好的OpenCV
git clone git@gitee.com:zhong-luping/ohos_opencv.git

  1. 将OpenCV拷贝到OpenHarmony目录的third_party下
cp -raf opencv ~/openharmony/third_party/

  1. 适当裁剪编译选项
    打开OpenCV目录下的BUILD.gn,如下:
    不需要video以及flann功能,将对应的模块注释即可。
import("//build/ohos.gni") group("opencv") { deps = [ "//third_party/opencv/modules/core:opencv_core", //"//third_party/opencv/modules/flann:opencv_flann", "//third_party/opencv/modules/imgproc:opencv_imgproc", "//third_party/opencv/modules/ml:opencv_ml", "//third_party/opencv/modules/photo:opencv_photo", "//third_party/opencv/modules/dnn:opencv_dnn", "//third_party/opencv/modules/features2d:opencv_features2d", "//third_party/opencv/modules/imgcodecs:opencv_imgcodecs", "//third_party/opencv/modules/videoio:opencv_videoio", "//third_party/opencv/modules/calib3d:opencv_calib3d", "//third_party/opencv/modules/highgui:opencv_highgui", "//third_party/opencv/modules/objdetect:opencv_objdetect", "//third_party/opencv/modules/stitching:opencv_stitching", "//third_party/opencv/modules/ts:opencv_ts", //"//third_party/opencv/modules/video:opencv_video", "//third_party/opencv/modules/gapi:opencv_gapi", ]

  1. 添加依赖子系统的part_name,编译框架子系统会将编译出的库拷贝到系统文件中。
    此项目中我们新建了一个SeetaFaceApp的子系统,该子系统中命名part_name为SeetafaceApi,所以我们需要在对应模块中的BUILD.gn中加上part_name="SeetafaceApi"
    以module/core为例:
ohos_shared_library("opencv_core"){ sources = [ ... ] configs = [... ] deps = [ ... ] part_name = "SeetafaceApi" }

  1. 编译工程需要添加OpenCV的依赖。
    在生成NAPI的BUILD.gn中添加以下依赖:
deps += [ "//third_party/opencv:opencv" ]

至此,人脸识别中OpenCV的移植使用完成。
SeetaFace2库移植
SeetaFace2是中科视拓开源的第二代人脸识别库。包括了搭建一套全自动人脸识别系统所需的三个核心模块,即:人脸检测模块FaceDetector、面部关键点定位模块FaceLandmarker以及人脸特征提取与比对模块 FaceRecognizer。
关于SeetaFace2的移植请参照文档:SeetaFace2移植开发文档。
NAPI接口开发
关于OpenHarmony中的NAPI开发,参考视频:
OpenHarmony中napi的开发视频教程。本文将重点讲解NAPI接口如何实现OpenCV以及SeetaFace的调用。
  1. 人脸框获取的NAPI接口的实现。
    int GetRecognizePoints(const char *image_path);
    此接口主要是通过应用层输入一张图片,通过OpenCV的imread接口获取到图片数据,并通过人脸检测模块FaceDetector分析获得图片中所有的人脸矩形框(矩形框是以x,y,w,h的方式)并将人脸框矩形以数组的方式返回到应用层。
    人脸框矩形获取的主要代码如下:
static int RecognizePoint(string image_path, FaceRect *rect, int num) { if (rect == nullptr) { cerr << "NULL POINT!" << endl; LOGE("NULL POINT! \n"); return -1; } seeta::ModelSetting::Device device = seeta::ModelSetting::CPU; int id = 0; /* 设置人脸识别模型。*/ seeta::ModelSetting FD_model( "/system/usr/model/fd_2_00.dat", device, id ); seeta::ModelSetting FL_model( "/system/usr/model/pd_2_00_pts81.dat", device, id ); seeta::FaceDetector FD(FD_model); seeta::FaceLandmarker FL(FL_model); FD.set(seeta::FaceDetector::PROPERTY_VIDEO_STABLE, 1); /* 读取图片数据 */ auto frame = imread(image_path); seeta::cv::ImageData simage = frame; if (simage.empty()) { cerr << "Can not open image: " << image_path << endl; LOGE("Can not open image: %{public}s", image_path.c_str()); return -1; } /* 图片数据进行人脸识别处理 ,获取所有的人脸框数据对象*/ auto faces = FD.detect(simage); if (faces.size <= 0) { cerr << "detect " << image_path << "failed!" << endl; LOGE("detect image: %s failed!", image_path.c_str()); return -1; } for (int i = 0; (i < faces.size && i < num); i++) { /* 将所有人脸框对象数据以坐标形式输出*/ auto &face = faces.data[i]; memcpy(&rect[i], &(face.pos), sizeof(FaceRect)); } return faces.size; }

其中FD_model是人脸检测模型,而FL_model是面部关键点定位模型(此模型分为5点定位和81点定位,本项目中使用的是81点定位模型),这些模型从开源项目中免费获取。
通过以上方式获取到对应的人脸矩形框后,再将矩形框以数组的方式返回到应用端:
string image = path; p = (FaceRect *)malloc(sizeof(FaceRect) * MAX_FACE_RECT); /* 根据图片进行人脸识别并获取人脸框坐标点 */ int retval = RecognizePoint(image, p, MAX_FACE_RECT); if (retval <= napi_ok) { LOGE("GetNapiValueString failed!"); free(p); return result; } /*将所有坐标点以数组方式返回到应用端*/ for (int i = 0; i < retval; i++) { int arry_int[4] = {p[i].x, p[i].y, p[i].w, p[i].h}; int arraySize = (sizeof(arry_int) / sizeof(arry_int[0])); for (int j = 0; j < arraySize; j++) { napi_value num_val; if (napi_create_int32(env, arry_int[j], &num_val) != napi_ok) { LOGE("napi_create_int32 failed!"); return result; } napi_set_element(env, array, i*arraySize + j, num_val); } } if (napi_create_object(env, &result) != napi_ok) { LOGE("napi_create_object failed!"); free(p); return result; } if (napi_set_named_property(env, result, "recognizeFrame", array) != napi_ok) { LOGE("napi_set_named_property failed!"); free(p); return result; } LOGI(""); free(p); return result;

其中array是通过napi_create_array创建的一个NAPI数组对象,通过 napi_set_element将所有的矩形框数据保存到array对象中,最后通过 napi_set_named_property将array转换成应用端可识别的对象类型result并将其返回。
  1. 人脸搜索识别初始化与逆初始化。
    1. int FaceSearchInit();
    2. int FaceSearchDeinit();
这2个接口主要是提供给人脸搜索以及识别调用的,初始化主要包含模型的注册以及识别模块的初始化:
staticint FaceSearchInit(FaceSearchInfo *info) { if (info == NULL) { info = (FaceSearchInfo *)malloc(sizeof(FaceSearchInfo)); if (info == nullptr) { cerr << "NULL POINT!" << endl; return -1; } }seeta::ModelSetting::Device device = seeta::ModelSetting::CPU; int id = 0; seeta::ModelSetting FD_model( "/system/usr/model/fd_2_00.dat", device, id ); seeta::ModelSetting PD_model( "/system/usr//model/pd_2_00_pts5.dat", device, id ); seeta::ModelSetting FR_model( "/system/usr/model/fr_2_10.dat", device, id ); info->engine = make_shared(FD_model, PD_model, FR_model, 2, 16); info->engine->FD.set( seeta::FaceDetector::PROPERTY_MIN_FACE_SIZE, 80); info->GalleryIndexMap.clear(); return 0; }

而逆初始化就是做一些内存的释放。
static void FaceSearchDeinit(FaceSearchInfo *info, int need_delete) { if (info != nullptr) { if (info->engine != nullptr) { }info->GalleryIndexMap.clear(); if (need_delete) { free(info); info = nullptr; } } }

  1. 人脸搜索识别注册接口的实现。
    int FaceSearchRegister(const char *value);
    需要注意的是,该接口需要应用端传入一个json数据的参数,主要包含注册人脸的名字,图片以及图片个数,如{"name":"刘德华","sum":"2","image":{"11.jpg","12.jpg"}}。而解析参数的时候需要调用 napi_get_named_property对json数据的各个对象进行解析,具体代码如下:
napi_get_cb_info(env, info, &argc, &argv, &thisVar, &data); napi_value object = argv; napi_value value = https://www.it610.com/article/nullptr; if (napi_get_named_property(env, object, (const char *)"name", &value) == napi_ok) { char name[64] = {0}; if (GetNapiValueString(env, value, (char *)name, sizeof(name)) < 0) { LOGE("GetNapiValueString failed!"); return result; } reg_info.name = name; } LOGI("name = %{public}s", reg_info.name.c_str()); if (napi_get_named_property(env, object, (const char *)"sum", &value) == napi_ok) {if (napi_get_value_uint32(env, value, &sum) != napi_ok) { LOGE("napi_get_value_uint32 failed!"); return result; } } LOGI("sum = %{public}d", sum); if (napi_get_named_property(env, object, (const char *)"image", &value) == napi_ok) { bool res = false; if (napi_is_array(env, value, &res) != napi_ok || res == false) { LOGE("napi_is_array failed!"); return result; } for (int i = 0; i < sum; i++) { char image[256] = {0}; napi_value imgPath = nullptr; if (napi_get_element(env, value, i, &imgPath) != napi_ok) { LOGE("napi_get_element failed!"); return result; } if (GetNapiValueString(env, imgPath, (char *)image, sizeof(image)) < 0) { LOGE("GetNapiValueString failed!"); return result; } reg_info.path = image; if (FaceSearchRegister(g_FaceSearch, reg_info) != napi_ok) { retval = -1; break; } } }

通过napi_get_cb_info获取从应用端传来的参数,并通过 napi_get_named_property获取对应的name以及图片个数,最后通过napi_get_element获取图片数组中的各个image,将name和image通过FaceSearchRegister接口将图片和名字注册到SeetaFace2模块的识别引擎中。具体实现如下:
static int FaceSearchRegister(FaceSearchInfo &info, RegisterInfo &gegister) { if (info.engine == nullptr) { cerr << "NULL POINT!" << endl; return -1; }seeta::cv::ImageData image = cv::imread(gegister.path); auto id = info.engine->Register(image); if (id >= 0) { info.GalleryIndexMap.insert(make_pair(id, gegister.name)); }return 0; }

注册完数据后,后续可以通过该引擎来识别对应的图片。
  1. 获取人脸搜索识别结果接口的实现。
char *FaceSearchGetRecognize(const char *image_path);

该接口实现了通过传入一张图片,在识别引擎中进行搜索识别。如果识别引擎中有类似的人脸注册,则返回对应人脸注册时的名字,否则返回不识别(ignored)字样。该方法是通过异步回调的方式实现的:
// 创建async work,创建成功后通过最后一个参数(commandStrData->asyncWork)返回async work的handle napi_value resourceName = nullptr; napi_create_string_utf8(env, "FaceSearchGetPersonRecognizeMethod", NAPI_AUTO_LENGTH, &resourceName); napi_create_async_work(env, nullptr, resourceName, FaceSearchRecognizeExecuteCB, FaceSearchRecognizeCompleteCB, (void *)commandStrData, &commandStrData->asyncWork); // 将刚创建的async work加到队列,由底层去调度执行 napi_queue_async_work(env, commandStrData->asyncWork);

其中FaceSearchRecognizeExecuteCB实现了人脸识别
static void FaceSearchRecognizeExecuteCB(napi_env env, void *data) { CommandStrData *commandStrData = https://www.it610.com/article/dynamic_cast((CommandStrData *)data); if (commandStrData =https://www.it610.com/article/= nullptr) { HILOG_ERROR("nullptr point!", __FUNCTION__, __LINE__); return; }FaceSearchInfo faceSearch = *(commandStrData->mFaceSearch); commandStrData->result = FaceSearchSearchRecognizer(faceSearch, commandStrData->filename); LOGI("Recognize result : %s !", __FUNCTION__, __LINE__, commandStrData->result.c_str()); }

FaceSearchRecognizeCompleteCB函数通过napi_resolve_deferred接口将识别结果返回到应用端。
static void FaceSearchRecognizeCompleteCB(napi_env env, napi_status status, void *data) { CommandStrData *commandStrData = https://www.it610.com/article/dynamic_cast((CommandStrData *)data); napi_value result; if (commandStrData =https://www.it610.com/article/= nullptr || commandStrData->deferred == nullptr) { LOGE("nullptr", __FUNCTION__, __LINE__); if (commandStrData != nullptr) { napi_delete_async_work(env, commandStrData->asyncWork); delete commandStrData; }return; }const char *result_str = (const char *)commandStrData->result.c_str(); if (napi_create_string_utf8(env, result_str, strlen(result_str), &result) != napi_ok) { LOGE("napi_create_string_utf8 failed!", __FUNCTION__, __LINE__); napi_delete_async_work(env, commandStrData->asyncWork); delete commandStrData; return; }napi_resolve_deferred(env, commandStrData->deferred, result); napi_delete_async_work(env, commandStrData->asyncWork); delete commandStrData; }

通过人脸特征提取与比对模块,对传入的数据与已注册的数据进行对比,并通过返回对比的相似度来进行判断当前人脸是否为可识别的,最后返回识别结果。具体实现代码:
static string FaceSearchSearchRecognizer(FaceSearchInfo &info, string filename) { if (info.engine == nullptr) { cerr << "NULL POINT!" << endl; return "recognize error 0"; } string name; float threshold = 0.7f; seeta::QualityAssessor QA; auto frame = cv::imread(filename); if (frame.empty()) { LOGE("read image %{public}s failed!", filename.c_str()); return "recognize error 1!"; } seeta::cv::ImageData image = frame; std::vector faces = info.engine->DetectFaces(image); for (SeetaFaceInfo &face : faces) { int64_t index = 0; float similarity = 0; auto points = info.engine->DetectPoints(image, face); auto score = QA.evaluate(image, face.pos, points.data()); if (score == 0) { name = "ignored"; } else { auto queried = info.engine->QueryTop(image, points.data(), 1, &index, &similarity); // no face queried from database if (queried < 1) continue; // similarity greater than threshold, means recognized if( similarity > threshold ) { name = info.GalleryIndexMap[index]; } } } LOGI("name : %{public}s \n", name.length() > 0 ? name.c_str() : "null"); return name.length() > 0 ? name : "recognize failed"; }

至此,所有的NAPI接口已经开发完成。
  1. NAPI库编译开发完NAPI接口后,我们需要将我们编写的库加入到系统中进行编译,我们需要添加一个自己的子系统。
    首先在库目录下新建一个ohos.build
{ "subsystem": "SeetafaceApp", "parts": { "SeetafaceApi": { "module_list": [ "//seetaface:seetafaceapp_napi" ], "test_list": [ ] } } }

其次同一目录新建一个BUILD.gn,将库源文件以及对应的依赖加上,如下:
import("//build/ohos.gni")config("lib_config") { cflags_cc = [ "-frtti", "-fexceptions", "-DCVAPI_EXPORTS", "-DOPENCV_ALLOCATOR_STATS_COUNTER_TYPE=int", "-D_USE_MATH_DEFINES", "-D__OPENCV_BUILD=1", "-D__STDC_CONSTANT_MACROS", "-D__STDC_FORMAT_MACROS", "-D__STDC_LIMIT_MACROS", "-O2", "-Wno-error=header-hygiene", ] }ohos_shared_library("seetafaceapp_napi") { sources = [ "app.cpp", ]include_dirs = [ "./", "//third_party/opencv/include", "//third_party/opencv/common", "//third_party/opencv/modules/core/include", "//third_party/opencv/modules/highgui/include", "//third_party/opencv/modules/imgcodecs/include", "//third_party/opencv/modules/imgproc/include", "//third_party/opencv/modules/calib3d/include", "//third_party/opencv/modules/dnn/include", "//third_party/opencv/modules/features2d/include", "//third_party/opencv/modules/flann/include", "//third_party/opencv/modules/ts/include", "//third_party/opencv/modules/video/include", "//third_party/opencv/modules/videoio/include", "//third_party/opencv/modules/ml/include", "//third_party/opencv/modules/objdetect/include", "//third_party/opencv/modules/photo/include", "//third_party/opencv/modules/stitching/include", "//third_party/SeetaFace2/FaceDetector/include", "//third_party/SeetaFace2/FaceLandmarker/include", "//third_party/SeetaFace2/FaceRecognizer/include", "//third_party/SeetaFace2/QualityAssessor/include", "//base/accessibility/common/log/include", "//base/hiviewdfx/hilog_lite/interfaces/native/innerkits" ]deps = [ "//foundation/ace/napi:ace_napi" ] deps += [ "//third_party/opencv:opencv" ] deps += [ "//third_party/SeetaFace2:SeetaFace2" ]external_deps = [ "hiviewdfx_hilog_native:libhilog", ]configs = [ ":lib_config" ]# 指定库生成的路径 relative_install_dir = "module" # 子系统及其组件,后面会引用 subsystem_name = "SeetafaceApp" part_name = "SeetafaceApi" }

添加完对应的文件后,我们需要将我们的子系统添加到系统中进行编译,打开build/subsystem_config.json并在最后添加以下代码:
"SeetafaceApp": { "path": "seetaface", "name": "SeetafaceApp" }

添加完子系统再修改产对应的品配置
打开productdefine/common/products/rk3568.json并在最后添加以下代码:
"SeetafaceApp:SeetafaceApi":{}

做完以上修改后我们就可以通过以下命令直接编译NAPI的库文件了:
./build.sh --product-name rk3568 --ccache

参考RK3568快速上手-镜像烧录完成烧录即可。
应用端开发
在完成设备NAPI功能开发后,应用端通过调用NAPI组件中暴露给应用的人脸识别接口,即可实现对应功能。接下来就带着大家使用NAPI实现人脸识别功能。
开发准备
  1. 下载DevEco Studio 3.0 Beta4;
  2. 搭建开发环境,参考开发准备;
  3. 了解属性eTS开发,参考eTS语言快速入门;
    SeetaFace2初始化
    1. 首先将SeetaFace2 NAPI接口声明文件放置于SDK目录/api下;
    2. 然后导入SeetaFace2 NAPI模块;ck-start/star
    3. 调用初始化接口;
// 首页实例创建后 async aboutToAppear() { await StorageUtils.clearModel(); CommonLog.info(TAG,'aboutToAppear') // 初始化人脸识别 let res = SeetafaceApp.FaceSearchInit() CommonLog.info(TAG,`FaceSearchInit res=${res}`) this.requestPermissions() }// 请求权限 requestPermissions(){ CommonLog.info(TAG,'requestPermissions') let context = featureAbility.getContext() context.requestPermissionsFromUser(PERMISSIONS, 666,(res)=>{ this.getMediaImage() }) }

【如何在OpenHarmony上使用SeetaFace2人脸识别库()】获取所有人脸图片
如何在OpenHarmony上使用SeetaFace2人脸识别库()
文章图片

通过文件管理模块fileio和媒体库管理mediaLibrary,获取指定应用数据目录下所有的图片信息,并将路径赋值给faceList,faceList数据用于Image组件提供url进行加载图片
// 获取所有图片 async getMediaImage(){ let context = featureAbility.getContext(); // 获取本地应用沙箱路径 let localPath = await context.getOrCreateLocalDir() CommonLog.info(TAG, `localPath:${localPath}`) let facePath = localPath + "/files" // 获取所有照片 this.faceList = await FileUtil.getImagePath(facePath) }

设置人脸模型
如何在OpenHarmony上使用SeetaFace2人脸识别库()
文章图片

获取选中的人脸图片地址和输入的名字,调用SeetafaceApp.FaceSearchRegister(params)进行设置人脸模型。其中参数params由name名字、image图片地址集合和sum图片数量组成。
async submit(name) { if (!name || name.length == 0) { CommonLog.info(TAG, 'name is empty') return } let selectArr = this.faceList.filter(item => item.isSelect) if (selectArr.length == 0) { CommonLog.info(TAG, 'faceList is empty') return } // 关闭弹窗 this.dialogController.close() try { let urls = [] let files = [] selectArr.forEach(item => { let source = item.url.replace('file://', '') CommonLog.info(TAG, `source:${source}`) urls.push(item.url) files.push(source) })// 设置人脸识别模型参数 let params = { name: name, image: files, sum: files.length } CommonLog.info(TAG, 'FaceSearchRegister' + JSON.stringify(params)) let res = SeetafaceApp.FaceSearchRegister(params) CommonLog.info(TAG, 'FaceSearchRegister res ' + res) // 保存已设置的人脸模型到轻量存储 let data = https://www.it610.com/article/{ name:name, urls:urls } let modelStr = await StorageUtils.getModel() let modelList = JSON.parse(modelStr) modelList.push(data) StorageUtils.setModel(modelList) router.back() } catch (err) { CommonLog.error(TAG,'submit fail ' + err) } }

实现框选人脸
如何在OpenHarmony上使用SeetaFace2人脸识别库()
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调用SeetafaceApp.GetRecognizePoints传入当前图片地址,获取到人脸左上和右下坐标,再通过CanvasRenderingContext2D对象绘画出人脸框。
实现人脸识别
如何在OpenHarmony上使用SeetaFace2人脸识别库()
文章图片

调用SeetafaceApp.FaceSearchGetRecognize(url),传入图片地址对人脸进行识别并返回对应识别出来的名字。
// 人脸识别 recognize(){ SeetafaceApp.FaceSearchGetRecognize(this.url).then(res=>{ CommonLog.info(TAG,'recognize suceess' + JSON.stringify(res)) if(res && res != 'ignored' && res != "recognize failed" && res != 'recognize error 1!'){ // 赋值识别到的人物模型 this.name = res }else{ this.name = '未识别到该模型' } }).catch(err=>{ CommonLog.error(TAG,'recognize' + err) this.name = '未识别到该模型' }) }

参考文档 SeetaFace2移植开发文档:
https://gitee.com/openharmony...
OpenHarmony中napi的开发视频教程:
https://www.bilibili.com/vide...
RK3568快速上手:
https://growing.openharmony.c...
人脸识别应用:
https://gitee.com/openharmony...
应用开发准备:
https://docs.openharmony.cn/p...
eTS语言快速入门:
https://docs.openharmony.cn/p...
知识体系工作组:
https://gitee.com/openharmony...
如何在OpenHarmony上使用SeetaFace2人脸识别库()
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