c# - 为 Kinects 深度场创建 3D 面部网格

Question

Kinect SDK 附带了一个在颜色流上创建面部网格的示例。看起来像:

http://imgur.com/TV6dHBC

我想为深度流创建一个 3D 网格

我的代码目前如下所示:

private EnumIndexableCollection<FeaturePoint, PointF> facePoints;
private EnumIndexableCollection<FeaturePoint, Vector3DF> depthPoints;

public void DrawFaceModel(DrawingContext drawingContext)
{
    if (!this.lastFaceTrackSucceeded || this.skeletonTrackingState != SkeletonTrackingState.Tracked)
        return;

    var faceModelPts = new List<Point>();
    var faceModelPts3D = new List<Point3D>();
    var faceModel = new List<FaceModelTriangle>();
    var faceModel3D = new List<FaceModelTriangle3D>();

    for (int i = 0; i < this.facePoints.Count; i++)
    {
        faceModelPts3D.Add(new Point3D(this.depthPoints[i].X + 0.5f, this.depthPoints[i].Y + 0.5f, this.depthPoints[i].Z + 0.5f));
    }

    FaceDataPoints.Number_of_Points = this.facePoints.Count;

    foreach (var t in ImageData.faceTriangles)
    {
        var triangle = new FaceModelTriangle3D();
        triangle.Point1_3D = faceModelPts3D[t.First];
        triangle.Point2_3D = faceModelPts3D[t.Second];
        triangle.Point3_3D = faceModelPts3D[t.Third];
        faceModel3D.Add(triangle);
    }

    var faceModelGroup = new GeometryGroup();
    for (int i = 0; i < faceModel.Count; i++)
    {
        var faceTriangle = new GeometryGroup();  
        faceTriangle.Children.Add(new LineGeometry(faceModel3D[i].Point1_3D, faceModel3D[i].Point2_3D)); 
        faceTriangle.Children.Add(new LineGeometry(faceModel3D[i].Point2_3D, faceModel3D[i].Point3_3D));
        faceTriangle.Children.Add(new LineGeometry(faceModel3D[i].Point3_3D, faceModel3D[i].Point1_3D));
        faceModelGroup.Children.Add(faceTriangle); //Add lines to image
    }

    drawingContext.DrawGeometry(Brushes.LightYellow, new Pen(Brushes.LightYellow, 1.0), faceModelGroup);
}

private struct FaceModelTriangle3D
{
     public Point3D Point1_3D;
     public Point3D Point2_3D;
     public Point3D Point3_3D;
}

我目前遇到错误 “错误 2 参数 1:无法从‘System.Windows.Media.Media3D.Point3D’转换为‘System.Windows.Point’ F:\Work\Uni\4th Year\Final Year Project\Project\Project 3.0\Project 3.0\FaceTrackingViewer.xaml.cs 275 68 项目 3.0 "

这是由于:

(new LineGeometry(faceModel3D[i].Point2_3D, faceModel3D[i].Point3_3D));

我需要使用什么来代替 LineGeometry 才能使它正常工作，或者有更有效的方法吗？

此外，一旦我创建了面部网格，我还希望能够存储此信息，以便能够计算面部各点之间的距离。那么我将如何存储三角形信息呢？

Answer 1

面部跟踪基础 WPF 示例使用 Point2D，但您使用的是 Point3D。

这意味着您将 3D 坐标传递给用于 2D 绘图的 LineGeometry 构造函数。您需要将 3D 世界坐标转换为 2D 屏幕坐标；一个称为投影的过程。

WPF 包含一个透视相机类，应该可以胜任这项工作

System.Windows.Media.Media3D.PerspectiveCamera

查看在 WPF 中创建 3D 场景 - MSDN