Unity换脸插件OpenCVForUnity实现换脸_unity 换脸拍照

最近捣鼓人脸识别的知识点，脑子笨，无从下手，然后各种度娘，然后发现一位大佬的文章很是有帮助，但是呢大佬就是大佬，只贴出了代码，小白如我的基本搞不定，没办法只能慢慢来细嚼慢咽，根据大佬的提示下载三个插件，三个插件已经备齐需要的自己去拿：点这里
接下来开始Demo之旅：本次使用Unity版本为2018.4.36 因为获取摄像头的AIP在2020的版本会出现卡顿（不知道啥原因，没在意，反正2018的没问题）
1：新建Unity工程，导入插件，然后找到OpenCVForUnity插件文件夹下的StreamingAssets/dnn - download_dnn_models.py文件 ，运行该文件自动下载某些依赖文件（下载完毕会自动关闭窗口）；
2：有些个文件可能下载不下来，找到setup_dnn_module.pdf文件按照相应的示例场景下载所需的依赖文件，然后再将所有插件文件夹下的StreamingAssets文件夹内容全部复制到Assets下的StreamingAssets文件夹下，重复的点击替换就行；Face相关的Demo需要下载必备文件，可以到我博客中查找下载，也可以直接运行文档中的.py文件下载。不过有些个文件说下载不了，可能是链接失效，可以在文档中直接点击链接下载相关文件。


3：我们需要用的示例场景为WebCamTextureFaceMaskExample；主要核心也就这几个脚本，运行结果看图；代码水平差点的着重看WebCamTextureFaceMaskExample这个脚本就行，别人都封装好了，能力高的，可以自己看相关代码在封装一次使用。看到文章提示篇幅过短，不会写作的我，把代码改了改，直接上代码，这下该够了把！！！！！偷笑！

脚本：WebCamTextureFaceMaskExample

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
using DlibFaceLandmarkDetector;
using OpenCVForUnity.RectangleTrack;
using OpenCVForUnity.UnityUtils.Helper;
using OpenCVForUnity.CoreModule;
using OpenCVForUnity.ObjdetectModule;
using OpenCVForUnity.ImgprocModule;
using Rect = OpenCVForUnity.CoreModule.Rect;
using UnityEditor;
using UnityEditor.Experimental.SceneManagement;
using OpenCVForUnity.VideoModule;

namespace FaceMaskExample
{
    /// <summary>
    /// WebCamTexture FaceMask Example
    /// </summary>
    [RequireComponent (typeof(WebCamTextureToMatHelper), typeof(TrackedMeshOverlay))]
    public class WebCamTextureFaceMaskExample : MonoBehaviour
    {
        [HeaderAttribute ("FaceMaskData")]

        /// <summary>
        /// The face mask data list.
        /// </summary>
        public List<FaceMaskData> faceMaskDatas;

        [HeaderAttribute ("Option")]

        /// <summary>
        /// Determines if use dlib face detector.
        /// </summary>
        public bool useDlibFaceDetecter = false;

        /// <summary>
        /// The use dlib face detecter toggle.
        /// </summary>
        public Toggle useDlibFaceDetecterToggle;

        /// <summary>
        /// Determines if enables noise filter.
        /// </summary>
        public bool enableNoiseFilter = true;

        /// <summary>
        /// The enable noise filter toggle.
        /// </summary>
        public Toggle enableNoiseFilterToggle;

        /// <summary>
        /// Determines if enables color correction.
        /// </summary>
        public bool enableColorCorrection = true;

        /// <summary>
        /// The enable color correction toggle.
        /// </summary>
        public Toggle enableColorCorrectionToggle;

        /// <summary>
        /// Determines if filters non frontal faces.
        /// </summary>
        public bool filterNonFrontalFaces = false;

        /// <summary>
        /// The filter non frontal faces toggle.
        /// </summary>
        public Toggle filterNonFrontalFacesToggle;

        /// <summary>
        /// The frontal face rate lower limit.
        /// </summary>
        [Range (0.0f, 1.0f)]
        public float frontalFaceRateLowerLimit = 0.85f;
        
        /// <summary>
        /// Determines if displays face rects.
        /// </summary>
        public bool displayFaceRects = false;
        
        /// <summary>
        /// The toggle for switching face rects display state
        /// </summary>
        public Toggle displayFaceRectsToggle;

        /// <summary>
        /// Determines if displays debug face points.
        /// </summary>
        public bool displayDebugFacePoints = false;

        /// <summary>
        /// The toggle for switching debug face points display state.
        /// </summary>
        public Toggle displayDebugFacePointsToggle;
        
        /// <summary>
        /// The gray mat.
        /// </summary>
        Mat grayMat;
        
        /// <summary>
        /// The texture.
        /// </summary>
        Texture2D texture;
        
        /// <summary>
        /// The cascade.
        /// </summary>
        CascadeClassifier cascade;

        /// <summary>
        /// The detection based tracker.
        /// </summary>
        RectangleTracker rectangleTracker;

        /// <summary>
        /// The web cam texture to mat helper.
        /// </summary>
        WebCamTextureToMatHelper webCamTextureToMatHelper;
        
        /// <summary>
        /// The face landmark detector.
        /// </summary>
        FaceLandmarkDetector faceLandmarkDetector;

        /// <summary>
        /// The mean points filter dictionary.
        /// </summary>
        Dictionary<int, LowPassPointsFilter> lowPassFilterDict;

        /// <summary>
        /// The optical flow points filter dictionary.
        /// </summary>
        Dictionary<int, OFPointsFilter> opticalFlowFilterDict;

        /// <summary>
        /// The face mask color corrector.
        /// </summary>
        FaceMaskColorCorrector faceMaskColorCorrector;
        
        /// <summary>
        /// The frontal face checker.
        /// </summary>
        FrontalFaceChecker frontalFaceChecker;
        
        /// <summary>
        /// The mesh overlay.
        /// </summary>
        TrackedMeshOverlay meshOverlay;

        /// <summary>
        /// The Shader.PropertyToID for "_Fade".
        /// </summary>
        int shader_FadeID;

        /// <summary>
        /// The Shader.PropertyToID for "_ColorCorrection".
        /// </summary>
        int shader_ColorCorrectionID;

        /// <summary>
        /// The Shader.PropertyToID for "_LUTTex".
        /// </summary>
        int shader_LUTTexID;

        /// <summary>
        /// The face mask texture.
        /// </summary>
        Texture2D faceMaskTexture;
        
        /// <summary>
        /// The face mask mat.
        /// </summary>
        Mat faceMaskMat;

        /// <summary>
        /// The index number of face mask data.
        /// </summary>
        int faceMaskDataIndex = 0;

        /// <summary>
        /// The detected face rect in mask mat.
        /// </summary>
        UnityEngine.Rect faceRectInMask;

        /// <summary>
        /// The detected face landmark points in mask mat.
        /// </summary>
        List<Vector2> faceLandmarkPointsInMask;

        /// <summary>
        /// The haarcascade_frontalface_alt_xml_filepath.
        /// </summary>
        string haarcascade_frontalface_alt_xml_filepath;

        /// <summary>
        /// The sp_human_face_68_dat_filepath.
        /// </summary>
        string sp_human_face_68_dat_filepath;

        /// <summary>
        /// The FPS monitor.
        /// </summary>
        FpsMonitor fpsMonitor;

        #if UNITY_WEBGL && !UNITY_EDITOR
        IEnumerator getFilePath_Coroutine;
        #endif

        // Use this for initialization
        void Start ()
        {
            fpsMonitor = GetComponent<FpsMonitor> ();

            webCamTextureToMatHelper = gameObject.GetComponent<WebCamTextureToMatHelper> ();

            #if UNITY_WEBGL && !UNITY_EDITOR
            getFilePath_Coroutine = GetFilePath ();
            StartCoroutine (getFilePath_Coroutine);
            #else
            haarcascade_frontalface_alt_xml_filepath = OpenCVForUnity.UnityUtils.Utils.getFilePath ("haarcascade_frontalface_alt.xml");
            sp_human_face_68_dat_filepath = DlibFaceLandmarkDetector.UnityUtils.Utils.getFilePath ("sp_human_face_68.dat");
            Run ();
            #endif
        }

        #if UNITY_WEBGL && !UNITY_EDITOR
        private IEnumerator GetFilePath ()
        {
            var getFilePathAsync_0_Coroutine = OpenCVForUnity.UnityUtils.Utils.getFilePathAsync ("haarcascade_frontalface_alt.xml", (result) => {
                haarcascade_frontalface_alt_xml_filepath = result;
            });
            yield return getFilePathAsync_0_Coroutine;

            var getFilePathAsync_1_Coroutine = DlibFaceLandmarkDetector.UnityUtils.Utils.getFilePathAsync ("sp_human_face_68.dat", (result) => {
                sp_human_face_68_dat_filepath = result;
            });
            yield return getFilePathAsync_1_Coroutine;

            getFilePath_Coroutine = null;

            Run ();
        }
        #endif

        private void Run ()
        {
            meshOverlay = this.GetComponent<TrackedMeshOverlay> ();

            shader_FadeID = Shader.PropertyToID ("_Fade");
            shader_ColorCorrectionID = Shader.PropertyToID ("_ColorCorrection");
            shader_LUTTexID = Shader.PropertyToID ("_LUTTex");

            rectangleTracker = new RectangleTracker ();

            faceLandmarkDetector = new FaceLandmarkDetector (sp_human_face_68_dat_filepath);

            lowPassFilterDict = new Dictionary<int, LowPassPointsFilter> ();
            opticalFlowFilterDict = new Dictionary<int, OFPointsFilter> ();

            faceMaskColorCorrector = new FaceMaskColorCorrector ();

            #if UNITY_ANDROID && !UNITY_EDITOR
            // Avoids the front camera low light issue that occurs in only some Android devices (e.g. Google Pixel, Pixel2).
            webCamTextureToMatHelper.avoidAndroidFrontCameraLowLightIssue = true;
            #endif
            webCamTextureToMatHelper.Initialize ();

            displayFaceRectsToggle.isOn = displayFaceRects;
            useDlibFaceDetecterToggle.isOn = useDlibFaceDetecter;
            enableNoiseFilterToggle.isOn = enableNoiseFilter;
            enableColorCorrectionToggle.isOn = enableColorCorrection;
            filterNonFrontalFacesToggle.isOn = filterNonFrontalFaces;
            displayDebugFacePointsToggle.isOn = displayDebugFacePoints;
        }

        /// <summary>
        /// Raises the web cam texture to mat helper initialized event.
        /// </summary>
        public void OnWebCamTextureToMatHelperInitialized ()
        {
            Debug.Log ("OnWebCamTextureToMatHelperInitialized");

            Mat webCamTextureMat = webCamTextureToMatHelper.GetMat ();

            texture = new Texture2D (webCamTextureMat.cols (), webCamTextureMat.rows (), TextureFormat.RGBA32, false);


            gameObject.transform.localScale = new Vector3 (webCamTextureMat.cols (), webCamTextureMat.rows (), 1);
            Debug.Log ("Screen.width " + Screen.width + " Screen.height " + Screen.height + " Screen.orientation " + Screen.orientation);

            if (fpsMonitor != null) {
                fpsMonitor.Add ("width", webCamTextureMat.width ().ToString ());
                fpsMonitor.Add ("height", webCamTextureMat.height ().ToString ());
                fpsMonitor.Add ("orientation", Screen.orientation.ToString ());
            }


            float width = gameObject.transform.localScale.x;
            float height = gameObject.transform.localScale.y;

            float widthScale = (float)Screen.width / width;
            float heightScale = (float)Screen.height / height;
            if (widthScale < heightScale) {
                Camera.main.orthographicSize = (width * (float)Screen.height / (float)Screen.width) / 2;
            } else {
                Camera.main.orthographicSize = height / 2;
            }

            gameObject.GetComponent<Renderer> ().material.mainTexture = texture;

            grayMat = new Mat (webCamTextureMat.rows (), webCamTextureMat.cols (), CvType.CV_8UC1);
            cascade = new CascadeClassifier (haarcascade_frontalface_alt_xml_filepath);
//            if (cascade.empty ()) {
//                Debug.LogError ("cascade file is not loaded.Please copy from “FaceTrackerExample/StreamingAssets/” to “Assets/StreamingAssets/” folder. ");
//            }

            frontalFaceChecker = new FrontalFaceChecker (width, height);

            meshOverlay.UpdateOverlayTransform (gameObject.transform);

            //OnChangeFaceMaskButtonClick ();
        }

        /// <summary>
        /// Raises the web cam texture to mat helper disposed event.
        /// </summary>
        public void OnWebCamTextureToMatHelperDisposed ()
        {
            Debug.Log ("OnWebCamTextureToMatHelperDisposed");

            grayMat.Dispose ();

            if (texture != null) {
                Texture2D.Destroy (texture);
                texture = null;
            }

            rectangleTracker.Reset ();
            meshOverlay.Reset ();

            foreach (var key in lowPassFilterDict.Keys) {
                lowPassFilterDict [key].Dispose ();
            }
            lowPassFilterDict.Clear ();
            foreach (var key in opticalFlowFilterDict.Keys) {
                opticalFlowFilterDict [key].Dispose ();
            }
            opticalFlowFilterDict.Clear ();

            faceMaskColorCorrector.Reset ();

            frontalFaceChecker.Dispose ();
        }

        /// <summary>
        /// Raises the web cam texture to mat helper error occurred event.
        /// </summary>
        /// <param name="errorCode">Error code.</param>
        public void OnWebCamTextureToMatHelperErrorOccurred (WebCamTextureToMatHelper.ErrorCode errorCode)
        {
            Debug.Log ("OnWebCamTextureToMatHelperErrorOccurred " + errorCode);
        }
        GameObject item = null;
        List<Vector2> landmasks = null;
        UnityEngine.Rect facemaskrect;
       
        // Update is called once per frame
        void Update ()
        {
            if (Input.GetKeyDown(KeyCode.Space))
            {
                //防止获取视频的图片卡帧或者获取的非当前帧，这里先暂停，不暂停会出现误差。不信你试试。。。
                webCamTextureToMatHelper.Pause();
                //Config.SaveTexture(gameObject.GetComponent<Renderer>().material.mainTexture as Texture2D, "wakaka");
                //这里是将获取到的图片存入本地。因为我是需要将预制存到本地，所以图片至关重要。
                Config.SaveTexture(gameObject.GetComponent<Renderer>().material.mainTexture as Texture2D, Application.dataPath + "/TestForOpenCV/Resources", "wakaka");
                if (item==null)
                {
                    //加载预制并将FaceMaskData重新赋值。
                    GameObject obj = Instantiate(Resources.Load<GameObject>("TestMask"), GameObject.Find("FaceMaskData").transform);
                    obj.GetComponent<FaceMaskData>().image = gameObject.GetComponent<Renderer>().material.mainTexture as Texture2D;
                    obj.GetComponent<FaceMaskData>().faceRect = facemaskrect;
                    obj.GetComponent<FaceMaskData>().landmarkPoints = landmasks;
                    var prefabInstance = PrefabUtility.GetCorrespondingObjectFromSource(obj);
                    // 非打开预制体模式下
                    if (prefabInstance)
                    {
                        var prefabPath = AssetDatabase.GetAssetPath(prefabInstance);
                        // 修改预制体，则只能先Unpack预制体再保存
                        PrefabUtility.UnpackPrefabInstance(obj, PrefabUnpackMode.Completely, InteractionMode.UserAction);
                        PrefabUtility.SaveAsPrefabAssetAndConnect(obj, prefabPath, InteractionMode.AutomatedAction);
                        // 不修改只新增，可以直接保存
                        PrefabUtility.SaveAsPrefabAsset(obj, prefabPath);
                    }
                    else
                    {
                        // 预制体模式下，从Prefab场景中取得预制体资源位置和根物体，并保存
                        // PrefabStage prefabStage = PrefabStageUtility.GetCurrentPrefabStage();
                        //预制体原始位置
                        string path = Application.dataPath + "/TestForOpenCV/Resources/TestMask.prefab";//prefabStage.prefabAssetPath;
                        GameObject root = obj; //prefabStage.prefabContentsRoot;
                        PrefabUtility.SaveAsPrefabAsset(root, path);
                    }
                    
                  OnChangeFaceMaskButtonClick(obj.GetComponent<FaceMaskData>());
                    /// gameObject.GetComponent<Renderer>().material.mainTexture = Config.GetTexture2d(@"D:\Program Files (x86)\DeskTop\Demo\tjd.png");
                  
                }
                // webCamTextureToMatHelper.Play();
            }
            if (webCamTextureToMatHelper.IsPlaying () && webCamTextureToMatHelper.DidUpdateThisFrame ()) {

                Mat rgbaMat = webCamTextureToMatHelper.GetMat ();

                // detect faces.
                List<Rect> detectResult = new List<Rect> ();
                if (useDlibFaceDetecter) {
                    OpenCVForUnityUtils.SetImage (faceLandmarkDetector, rgbaMat);
                    List<UnityEngine.Rect> result = faceLandmarkDetector.Detect ();

                    foreach (var unityRect in result) {
                        detectResult.Add (new Rect ((int)unityRect.x, (int)unityRect.y, (int)unityRect.width, (int)unityRect.height));
                    }
                } else {
                    // convert image to greyscale.
                    Imgproc.cvtColor (rgbaMat, grayMat, Imgproc.COLOR_RGBA2GRAY);

                    using (Mat equalizeHistMat = new Mat ())
                    using (MatOfRect faces = new MatOfRect ()) {
                        Imgproc.equalizeHist (grayMat, equalizeHistMat);

                        cascade.detectMultiScale (equalizeHistMat, faces, 1.1f, 2, 0 | Objdetect.CASCADE_SCALE_IMAGE, new Size (equalizeHistMat.cols () * 0.15, equalizeHistMat.cols () * 0.15), new Size ());

                        detectResult = faces.toList ();
                    }

                    // corrects the deviation of a detection result between OpenCV and Dlib.
                    foreach (Rect r in detectResult) {
                        r.y += (int)(r.height * 0.1f);
                    }
                }


                // face tracking.
                rectangleTracker.UpdateTrackedObjects (detectResult);
                List<TrackedRect> trackedRects = new List<TrackedRect> ();
                rectangleTracker.GetObjects (trackedRects, true);

                // create noise filter.
                foreach (var openCVRect in trackedRects) {
                    if (openCVRect.state == TrackedState.NEW) {
                        if (!lowPassFilterDict.ContainsKey (openCVRect.id))
                            lowPassFilterDict.Add (openCVRect.id, new LowPassPointsFilter ((int)faceLandmarkDetector.GetShapePredictorNumParts ()));
                        if (!opticalFlowFilterDict.ContainsKey (openCVRect.id))
                            opticalFlowFilterDict.Add (openCVRect.id, new OFPointsFilter ((int)faceLandmarkDetector.GetShapePredictorNumParts ()));
                    } else if (openCVRect.state == TrackedState.DELETED) {
                        if (lowPassFilterDict.ContainsKey (openCVRect.id)) {
                            lowPassFilterDict [openCVRect.id].Dispose ();
                            lowPassFilterDict.Remove (openCVRect.id);
                        }
                        if (opticalFlowFilterDict.ContainsKey (openCVRect.id)) {
                            opticalFlowFilterDict [openCVRect.id].Dispose ();
                            opticalFlowFilterDict.Remove (openCVRect.id);
                        }
                    }
                }

                // create LUT texture.
                foreach (var openCVRect in trackedRects) {
                    if (openCVRect.state == TrackedState.NEW) {
                        faceMaskColorCorrector.CreateLUTTex (openCVRect.id);
                    } else if (openCVRect.state == TrackedState.DELETED) {
                        faceMaskColorCorrector.DeleteLUTTex (openCVRect.id);
                    }
                }

                // detect face landmark points.
                OpenCVForUnityUtils.SetImage (faceLandmarkDetector, rgbaMat);
                List<List<Vector2>> landmarkPoints = new List<List<Vector2>> ();
                for (int i = 0; i < trackedRects.Count; i++) {
                    TrackedRect tr = trackedRects [i];
                    UnityEngine.Rect rect = new UnityEngine.Rect (tr.x, tr.y, tr.width, tr.height);

                    List<Vector2> points = faceLandmarkDetector.DetectLandmark (rect);

                    // apply noise filter.
                    if (enableNoiseFilter) {
                        if (tr.state > TrackedState.NEW && tr.state < TrackedState.DELETED) {
                            opticalFlowFilterDict [tr.id].Process (rgbaMat, points, points);
                            lowPassFilterDict [tr.id].Process (rgbaMat, points, points);
                        }
                    }

                    landmarkPoints.Add (points);
                }
           
                if (landmarkPoints.Count > 0)
                {
                    landmasks = landmarkPoints[0];
                    facemaskrect = new UnityEngine.Rect(trackedRects[0].x, trackedRects[0].y, trackedRects[0].width, trackedRects[0].height);
                    print(string.Format("当前识别到人脸数量为：{0}，标志点为：{1},追踪人数：{2}", landmarkPoints.Count, landmarkPoints[0].Count, trackedRects.Count));
                }
                SetFaceMask(landmarkPoints, trackedRects, rgbaMat);
                // draw face rects.
                if (displayFaceRects) {
                    for (int i = 0; i < detectResult.Count; i++) {
                        UnityEngine.Rect rect = new UnityEngine.Rect (detectResult [i].x, detectResult [i].y, detectResult [i].width, detectResult [i].height);
                        OpenCVForUnityUtils.DrawFaceRect (rgbaMat, rect, new Scalar (255, 0, 0, 255), 2);
                    }

                    for (int i = 0; i < trackedRects.Count; i++) {
                        UnityEngine.Rect rect = new UnityEngine.Rect (trackedRects [i].x, trackedRects [i].y, trackedRects [i].width, trackedRects [i].height);
                        OpenCVForUnityUtils.DrawFaceRect (rgbaMat, rect, new Scalar (255, 255, 0, 255), 2);
//                        Imgproc.putText (rgbaMat, " " + frontalFaceChecker.GetFrontalFaceAngles (landmarkPoints [i]), new Point (rect.xMin, rect.yMin - 10), Imgproc.FONT_HERSHEY_SIMPLEX, 0.5, new Scalar (255, 255, 255, 255), 2, Imgproc.LINE_AA, false);
//                        Imgproc.putText (rgbaMat, " " + frontalFaceChecker.GetFrontalFaceRate (landmarkPoints [i]), new Point (rect.xMin, rect.yMin - 10), Imgproc.FONT_HERSHEY_SIMPLEX, 0.5, new Scalar (255, 255, 255, 255), 2, Imgproc.LINE_AA, false);
                    }
                }

                // draw face points.
                if (displayDebugFacePoints) {
                    for (int i = 0; i < landmarkPoints.Count; i++) {
                        OpenCVForUnityUtils.DrawFaceLandmark (rgbaMat, landmarkPoints [i], new Scalar (0, 255, 0, 255), 2);
                    }
                }


                // display face mask image.
                if (faceMaskTexture != null && faceMaskMat != null) {

                    if (displayFaceRects) {
                        OpenCVForUnityUtils.DrawFaceRect (faceMaskMat, faceRectInMask, new Scalar (255, 0, 0, 255), 2);
                    }
                    if (displayDebugFacePoints) {
                        OpenCVForUnityUtils.DrawFaceLandmark (faceMaskMat, faceLandmarkPointsInMask, new Scalar (0, 255, 0, 255), 2);
                    }

                    float scale = (rgbaMat.width () / 4f) / faceMaskMat.width ();
                    float tx = rgbaMat.width () - faceMaskMat.width () * scale;
                    float ty = 0.0f;
                    Mat trans = new Mat (2, 3, CvType.CV_32F);//1.0, 0.0, tx, 0.0, 1.0, ty);
                    trans.put (0, 0, scale);
                    trans.put (0, 1, 0.0f);
                    trans.put (0, 2, tx);
                    trans.put (1, 0, 0.0f);
                    trans.put (1, 1, scale);
                    trans.put (1, 2, ty);
                    
                    Imgproc.warpAffine (faceMaskMat, rgbaMat, trans, rgbaMat.size (), Imgproc.INTER_LINEAR, Core.BORDER_TRANSPARENT, new Scalar (0));

                    if (displayFaceRects || displayDebugFacePointsToggle)
                        OpenCVForUnity.UnityUtils.Utils.texture2DToMat (faceMaskTexture, faceMaskMat);
                }

//                Imgproc.putText (rgbaMat, "W:" + rgbaMat.width () + " H:" + rgbaMat.height () + " SO:" + Screen.orientation, new Point (5, rgbaMat.rows () - 10), Imgproc.FONT_HERSHEY_SIMPLEX, 0.5, new Scalar (255, 255, 255, 255), 1, Imgproc.LINE_AA, false);

                OpenCVForUnity.UnityUtils.Utils.fastMatToTexture2D (rgbaMat, texture);
            }
        }
        private void SetFaceMask(List<List<Vector2>> landmarkPoints, List<TrackedRect> trackedRects, Mat rgbaMat) 
        {
            #region face masking.
            // face masking.
            if (faceMaskTexture != null && landmarkPoints.Count >= 1)
            { // Apply face masking between detected faces and a face mask image.

                float maskImageWidth = faceMaskTexture.width;
                float maskImageHeight = faceMaskTexture.height;

                TrackedRect tr;

                for (int i = 0; i < trackedRects.Count; i++)
                {
                    tr = trackedRects[i];

                    if (tr.state == TrackedState.NEW)
                    {
                        meshOverlay.CreateObject(tr.id, faceMaskTexture);
                    }
                    if (tr.state < TrackedState.DELETED)
                    {
                        MaskFace(meshOverlay, tr, landmarkPoints[i], faceLandmarkPointsInMask, maskImageWidth, maskImageHeight);

                        if (enableColorCorrection)
                        {
                            CorrectFaceMaskColor(tr.id, faceMaskMat, rgbaMat, faceLandmarkPointsInMask, landmarkPoints[i]);
                        }
                    }
                    else if (tr.state == TrackedState.DELETED)
                    {
                        meshOverlay.DeleteObject(tr.id);
                    }
                }
            }
            else if (landmarkPoints.Count >= 1)
            { // Apply face masking between detected faces.

                float maskImageWidth = texture.width;
                float maskImageHeight = texture.height;

                TrackedRect tr;

                for (int i = 0; i < trackedRects.Count; i++)
                {
                    tr = trackedRects[i];

                    if (tr.state == TrackedState.NEW)
                    {
                        meshOverlay.CreateObject(tr.id, texture);
                    }
                    if (tr.state < TrackedState.DELETED)
                    {
                        MaskFace(meshOverlay, tr, landmarkPoints[i], landmarkPoints[0], maskImageWidth, maskImageHeight);

                        if (enableColorCorrection)
                        {
                            CorrectFaceMaskColor(tr.id, rgbaMat, rgbaMat, landmarkPoints[0], landmarkPoints[i]);
                        }
                    }
                    else if (tr.state == TrackedState.DELETED)
                    {
                        meshOverlay.DeleteObject(tr.id);
                    }
                }
            }
            #endregion
        }
        private void MaskFace (TrackedMeshOverlay meshOverlay, TrackedRect tr, List<Vector2> landmarkPoints, List<Vector2> landmarkPointsInMaskImage, float maskImageWidth = 0, float maskImageHeight = 0)
        {
            float imageWidth = meshOverlay.width;
            float imageHeight = meshOverlay.height; 

            if (maskImageWidth == 0)
                maskImageWidth = imageWidth;

            if (maskImageHeight == 0)
                maskImageHeight = imageHeight;

            TrackedMesh tm = meshOverlay.GetObjectById (tr.id);

            Vector3[] vertices = tm.meshFilter.mesh.vertices;
            if (vertices.Length == landmarkPoints.Count) {
                for (int j = 0; j < vertices.Length; j++) {
                    vertices [j].x = landmarkPoints [j].x / imageWidth - 0.5f;
                    vertices [j].y = 0.5f - landmarkPoints [j].y / imageHeight;
                }
            }
            Vector2[] uv = tm.meshFilter.mesh.uv;
            if (uv.Length == landmarkPointsInMaskImage.Count) {
                for (int jj = 0; jj < uv.Length; jj++) {
                    uv [jj].x = landmarkPointsInMaskImage [jj].x / maskImageWidth;
                    uv [jj].y = (maskImageHeight - landmarkPointsInMaskImage [jj].y) / maskImageHeight;
                }
            }
            meshOverlay.UpdateObject (tr.id, vertices, null, uv);

            if (tr.numFramesNotDetected > 3) {
                tm.sharedMaterial.SetFloat (shader_FadeID, 1f);
            } else if (tr.numFramesNotDetected > 0 && tr.numFramesNotDetected <= 3) {
                tm.sharedMaterial.SetFloat (shader_FadeID, 0.3f + (0.7f / 4f) * tr.numFramesNotDetected);
            } else {
                tm.sharedMaterial.SetFloat (shader_FadeID, 0.3f);
            }

            if (enableColorCorrection) {
                tm.sharedMaterial.SetFloat (shader_ColorCorrectionID, 1f);
            } else {
                tm.sharedMaterial.SetFloat (shader_ColorCorrectionID, 0f);
            }

            // filter non frontal faces.
            if (filterNonFrontalFaces && frontalFaceChecker.GetFrontalFaceRate (landmarkPoints) < frontalFaceRateLowerLimit) {
                tm.sharedMaterial.SetFloat (shader_FadeID, 1f);
            }
        }

        private void CorrectFaceMaskColor (int id, Mat src, Mat dst, List<Vector2> src_landmarkPoints, List<Vector2> dst_landmarkPoints)
        {
            Texture2D LUTTex = faceMaskColorCorrector.UpdateLUTTex (id, src, dst, src_landmarkPoints, dst_landmarkPoints);
            TrackedMesh tm = meshOverlay.GetObjectById (id);
            tm.sharedMaterial.SetTexture (shader_LUTTexID, LUTTex);
        }

        /// <summary>
        /// Raises the destroy event.
        /// </summary>
        void OnDestroy ()
        {
            webCamTextureToMatHelper.Dispose ();

            if (cascade != null)
                cascade.Dispose ();

            if (rectangleTracker != null)
                rectangleTracker.Dispose ();

            if (faceLandmarkDetector != null)
                faceLandmarkDetector.Dispose ();

            foreach (var key in lowPassFilterDict.Keys) {
                lowPassFilterDict [key].Dispose ();
            }
            lowPassFilterDict.Clear ();
            foreach (var key in opticalFlowFilterDict.Keys) {
                opticalFlowFilterDict [key].Dispose ();
            }
            opticalFlowFilterDict.Clear ();

            if (faceMaskColorCorrector != null)
                faceMaskColorCorrector.Dispose ();

            #if UNITY_WEBGL && !UNITY_EDITOR
            if (getFilePath_Coroutine != null) {
                StopCoroutine (getFilePath_Coroutine);
                ((IDisposable)getFilePath_Coroutine).Dispose ();
            }
            #endif
        }

        /// <summary>
        /// Raises the back button click event.
        /// </summary>
        public void OnBackButtonClick ()
        {
            SceneManager.LoadScene ("FaceMaskExample");
        }

        /// <summary>
        /// Raises the play button click event.
        /// </summary>
        public void OnPlayButtonClick ()
        {
            webCamTextureToMatHelper.Play ();
        }

        /// <summary>
        /// Raises the pause button click event.
        /// </summary>
        public void OnPauseButtonClick ()
        {
            webCamTextureToMatHelper.Pause ();
        }

        /// <summary>
        /// Raises the change camera button click event.
        /// </summary>
        public void OnChangeCameraButtonClick ()
        {
            webCamTextureToMatHelper.requestedIsFrontFacing = !webCamTextureToMatHelper.IsFrontFacing ();
        }

        /// <summary>
        /// Raises the use Dlib face detector toggle value changed event.
        /// </summary>
        public void OnUseDlibFaceDetecterToggleValueChanged ()
        {
            if (useDlibFaceDetecterToggle.isOn) {
                useDlibFaceDetecter = true;
            } else {
                useDlibFaceDetecter = false;
            }
        }

        /// <summary>
        /// Raises the enable noise filter toggle value changed event.
        /// </summary>
        public void OnEnableNoiseFilterToggleValueChanged ()
        {
            if (enableNoiseFilterToggle.isOn) {
                enableNoiseFilter = true;
                foreach (var key in lowPassFilterDict.Keys) {
                    lowPassFilterDict [key].Reset ();
                }
                foreach (var key in opticalFlowFilterDict.Keys) {
                    opticalFlowFilterDict [key].Reset ();
                }
            } else {
                enableNoiseFilter = false;
            }
        }

        /// <summary>
        /// Raises the enable color correction toggle value changed event.
        /// </summary>
        public void OnEnableColorCorrectionToggleValueChanged ()
        {
            if (enableColorCorrectionToggle.isOn) {
                enableColorCorrection = true;
            } else {
                enableColorCorrection = false;
            }
        }

        /// <summary>
        /// Raises the filter non frontal faces toggle value changed event.
        /// </summary>
        public void OnFilterNonFrontalFacesToggleValueChanged ()
        {
            if (filterNonFrontalFacesToggle.isOn) {
                filterNonFrontalFaces = true;
            } else {
                filterNonFrontalFaces = false;
            }
        }

        /// <summary>
        /// Raises the display face rects toggle value changed event.
        /// </summary>
        public void OnDisplayFaceRectsToggleValueChanged ()
        {
            if (displayFaceRectsToggle.isOn) {
                displayFaceRects = true;
            } else {
                displayFaceRects = false;
            }
        }

        /// <summary>
        /// Raises the display debug face points toggle value changed event.
        /// </summary>
        public void OnDisplayDebugFacePointsToggleValueChanged ()
        {
            if (displayDebugFacePointsToggle.isOn) {
                displayDebugFacePoints = true;
            } else {
                displayDebugFacePoints = false;
            }
        }
        /// <summary>
        /// Raises the change face mask button click event.
        /// </summary>
        public void OnChangeFaceMaskButtonClick(FaceMaskData faceMask)
        {
            RemoveFaceMask();

            if (faceMaskDatas.Count == 0)
                return;

            FaceMaskData maskData = faceMask; 
            if (maskData == null)
            {
                Debug.LogError("maskData == null");
                return;
            }

            if (maskData.image == null)
            {
                Debug.LogError("image == null");
                return;
            }

            if (maskData.landmarkPoints.Count != 68)
            {
                Debug.LogError("landmarkPoints.Count != 68");
                return;
            }

            faceMaskTexture = maskData.image;
            faceMaskMat = new Mat(faceMaskTexture.height, faceMaskTexture.width, CvType.CV_8UC4);
            OpenCVForUnity.UnityUtils.Utils.texture2DToMat(faceMaskTexture, faceMaskMat);

            if (maskData.isDynamicMode)
            {
                faceRectInMask = DetectFace(faceMaskMat);
                faceLandmarkPointsInMask = DetectFaceLandmarkPoints(faceMaskMat, faceRectInMask);

                maskData.faceRect = faceRectInMask;
                maskData.landmarkPoints = faceLandmarkPointsInMask;
            }
            else
            {
                faceRectInMask = maskData.faceRect;
                faceLandmarkPointsInMask = maskData.landmarkPoints;
            }

            if (faceRectInMask.width == 0 && faceRectInMask.height == 0)
            {
                RemoveFaceMask();
                Debug.LogError("A face could not be detected from the input image.");
            }

            enableColorCorrectionToggle.isOn = maskData.enableColorCorrection;
        }
        /// <summary>
        /// Raises the change face mask button click event.
        /// </summary>
        public void OnChangeFaceMaskButtonClick ()
        {
            RemoveFaceMask ();

            if (faceMaskDatas.Count == 0)
                return;
            
            FaceMaskData maskData = faceMaskDatas [faceMaskDataIndex];
            faceMaskDataIndex = (faceMaskDataIndex < faceMaskDatas.Count - 1) ? faceMaskDataIndex + 1 : 0;

            if (maskData == null) {
                Debug.LogError ("maskData == null");
                return;
            }

            if (maskData.image == null) {
                Debug.LogError ("image == null");
                return;
            }

            if (maskData.landmarkPoints.Count != 68) {
                Debug.LogError ("landmarkPoints.Count != 68");
                return;
            }

            faceMaskTexture = maskData.image;
            faceMaskMat = new Mat (faceMaskTexture.height, faceMaskTexture.width, CvType.CV_8UC4);
            OpenCVForUnity.UnityUtils.Utils.texture2DToMat (faceMaskTexture, faceMaskMat);

            if (maskData.isDynamicMode) {
                faceRectInMask = DetectFace (faceMaskMat);
                faceLandmarkPointsInMask = DetectFaceLandmarkPoints (faceMaskMat, faceRectInMask);

                maskData.faceRect = faceRectInMask;
                maskData.landmarkPoints = faceLandmarkPointsInMask;
            } else {
                faceRectInMask = maskData.faceRect;
                faceLandmarkPointsInMask = maskData.landmarkPoints;
            }

            if (faceRectInMask.width == 0 && faceRectInMask.height == 0) {
                RemoveFaceMask ();
                Debug.LogError ("A face could not be detected from the input image.");
            }

            enableColorCorrectionToggle.isOn = maskData.enableColorCorrection;
        }

        /// <summary>
        /// Raises the scan face mask button click event.
        /// </summary>
        public void OnScanFaceMaskButtonClick ()
        {
            RemoveFaceMask ();

            // Capture webcam frame.
            if (webCamTextureToMatHelper.IsPlaying ()) {

                Mat rgbaMat = webCamTextureToMatHelper.GetMat ();

                faceRectInMask = DetectFace (rgbaMat);
                if (faceRectInMask.width == 0 && faceRectInMask.height == 0) {
                    Debug.Log ("A face could not be detected from the input image.");
                    return;
                }

                Rect rect = new Rect ((int)faceRectInMask.x, (int)faceRectInMask.y, (int)faceRectInMask.width, (int)faceRectInMask.height);
                rect.inflate (rect.x / 5, rect.y / 5);
                rect = rect.intersect (new Rect (0, 0, rgbaMat.width (), rgbaMat.height ()));

                faceMaskTexture = new Texture2D (rect.width, rect.height, TextureFormat.RGBA32, false);
                faceMaskMat = new Mat (rgbaMat, rect).clone ();
                OpenCVForUnity.UnityUtils.Utils.matToTexture2D (faceMaskMat, faceMaskTexture);
                Debug.Log ("faceMaskMat ToString " + faceMaskMat.ToString ());

                faceRectInMask = DetectFace (faceMaskMat);
                faceLandmarkPointsInMask = DetectFaceLandmarkPoints (faceMaskMat, faceRectInMask);

                if (faceRectInMask.width == 0 && faceRectInMask.height == 0) {
                    RemoveFaceMask ();
                    Debug.Log ("A face could not be detected from the input image.");
                }
            }
        }

        /// <summary>
        /// Raises the remove face mask button click event.
        /// </summary>
        public void OnRemoveFaceMaskButtonClick ()
        {
            RemoveFaceMask ();
        }

        private void RemoveFaceMask ()
        {
            faceMaskTexture = null;
            if (faceMaskMat != null) {
                faceMaskMat.Dispose ();
                faceMaskMat = null;
            }

            rectangleTracker.Reset ();
            meshOverlay.Reset ();
        }

        private UnityEngine.Rect DetectFace (Mat mat)
        {
            if (useDlibFaceDetecter) {
                OpenCVForUnityUtils.SetImage (faceLandmarkDetector, mat);
                List<UnityEngine.Rect> result = faceLandmarkDetector.Detect ();
                if (result.Count >= 1)
                    return result [0];
            } else {
                
                using (Mat grayMat = new Mat ())
                using (Mat equalizeHistMat = new Mat ())
                using (MatOfRect faces = new MatOfRect ()) {
                    // convert image to greyscale.
                    Imgproc.cvtColor (mat, grayMat, Imgproc.COLOR_RGBA2GRAY);
                    Imgproc.equalizeHist (grayMat, equalizeHistMat);
                    
                    cascade.detectMultiScale (equalizeHistMat, faces, 1.1f, 2, 0 | Objdetect.CASCADE_SCALE_IMAGE, new Size (equalizeHistMat.cols () * 0.15, equalizeHistMat.cols () * 0.15), new Size ());

                    List<Rect> faceList = faces.toList ();
                    if (faceList.Count >= 1) {
                        UnityEngine.Rect r = new UnityEngine.Rect (faceList [0].x, faceList [0].y, faceList [0].width, faceList [0].height);
                        // corrects the deviation of a detection result between OpenCV and Dlib.
                        r.y += (int)(r.height * 0.1f);
                        return r;
                    }
                }
            }
            return new UnityEngine.Rect ();
        }

        private List<Vector2> DetectFaceLandmarkPoints (Mat mat, UnityEngine.Rect rect)
        {
            OpenCVForUnityUtils.SetImage (faceLandmarkDetector, mat);
            List<Vector2> points = faceLandmarkDetector.DetectLandmark (rect);

            return points;
        }
    }
}
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场景设置：

运行结果：


4：接下来就是看核心代码了，正在研究中，本文就先写到这里；欢迎各位大佬帮忙指点！