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

            Mat grayMat = webCamTextureToMatHelper.GetMat();

            texture          = new Texture2D(grayMat.cols(), grayMat.rows(), TextureFormat.Alpha8, false);
            texture.wrapMode = TextureWrapMode.Clamp;
            quad_renderer    = gameObject.GetComponent <Renderer>() as Renderer;
            quad_renderer.sharedMaterial.SetTexture("_MainTex", texture);
            quad_renderer.sharedMaterial.SetVector("_VignetteOffset", new Vector4(0, 0));


            //Debug.Log("Screen.width " + Screen.width + " Screen.height " + Screen.height + " Screen.orientation " + Screen.orientation);


            DebugUtils.AddDebugStr(webCamTextureToMatHelper.GetWidth() + " x " + webCamTextureToMatHelper.GetHeight() + " : " + webCamTextureToMatHelper.GetFPS());
            if (enableDownScale)
            {
                DebugUtils.AddDebugStr("enableDownScale = true: " + imageOptimizationHelper.downscaleRatio + " / " + webCamTextureToMatHelper.GetWidth() / imageOptimizationHelper.downscaleRatio + " x " + webCamTextureToMatHelper.GetHeight() / imageOptimizationHelper.downscaleRatio);
            }


            Matrix4x4 projectionMatrix;

#if WINDOWS_UWP && !DISABLE_HOLOLENSCAMSTREAM_API
            projectionMatrix = webCamTextureToMatHelper.GetProjectionMatrix();
            quad_renderer.sharedMaterial.SetMatrix("_CameraProjectionMatrix", projectionMatrix);
#else
            //This value is obtained from PhotoCapture's TryGetProjectionMatrix() method.I do not know whether this method is good.
            //Please see the discussion of this thread.Https://forums.hololens.com/discussion/782/live-stream-of-locatable-camera-webcam-in-unity
            projectionMatrix     = Matrix4x4.identity;
            projectionMatrix.m00 = 2.31029f;
            projectionMatrix.m01 = 0.00000f;
            projectionMatrix.m02 = 0.09614f;
            projectionMatrix.m03 = 0.00000f;
            projectionMatrix.m10 = 0.00000f;
            projectionMatrix.m11 = 4.10427f;
            projectionMatrix.m12 = -0.06231f;
            projectionMatrix.m13 = 0.00000f;
            projectionMatrix.m20 = 0.00000f;
            projectionMatrix.m21 = 0.00000f;
            projectionMatrix.m22 = -1.00000f;
            projectionMatrix.m23 = 0.00000f;
            projectionMatrix.m30 = 0.00000f;
            projectionMatrix.m31 = 0.00000f;
            projectionMatrix.m32 = -1.00000f;
            projectionMatrix.m33 = 0.00000f;
            quad_renderer.sharedMaterial.SetMatrix("_CameraProjectionMatrix", projectionMatrix);
#endif

            quad_renderer.sharedMaterial.SetFloat("_VignetteScale", 0.0f);


            cascade = new CascadeClassifier();
            cascade.load(Utils.getFilePath("lbpcascade_frontalface.xml"));
#if !UNITY_WSA_10_0 || UNITY_EDITOR
            // "empty" method is not working on the UWP platform.
            if (cascade.empty())
            {
                Debug.LogError("cascade file is not loaded. Please copy from “OpenCVForUnity/StreamingAssets/” to “Assets/StreamingAssets/” folder. ");
            }
#endif

            grayMat4Thread = new Mat();
            cascade4Thread = new CascadeClassifier();
            cascade4Thread.load(Utils.getFilePath("haarcascade_frontalface_alt.xml"));
#if !UNITY_WSA_10_0 || UNITY_EDITOR
            // "empty" method is not working on the UWP platform.
            if (cascade4Thread.empty())
            {
                Debug.LogError("cascade file is not loaded. Please copy from “OpenCVForUnity/StreamingAssets/” to “Assets/StreamingAssets/” folder. ");
            }
#endif
        }