human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "Three-dimensional scene flow"
  Abstract: Scene flow is the three-dimensional motion field of points in the world, just as optical flow is the two-dimensional motion field of points in an image. Any optical flow is simply the projection of the scene flow onto the image plane of a camera. We present a framework for the computation of dense, non-rigid scene flow from optical flow. Our approach leads to straightforward linear algorithms and a classification of the task into three major scenarios: complete instantaneous knowledge of the scene structure; knowledge only of correspondence information; and no knowledge of the scene structure. We also show that multiple estimates of the normal flow cannot be used to estimate dense scene flow directly without some form of smoothing or regularization.

Connected through hyperedge HE-1 (induced by source paper "Photorealistic scene reconstruction by voxel coloring"):
  with members:
    - "Plenoptic image editing"
    - "Image-based rendering using image-based priors"
    - "Layered probability maps: basic framework and prototype system"
    - "A probabilistic framework for space carving"
    - "Voxel carving for specular surfaces"
    - "Tangible interaction + graphical interpretation: a new approach to 3D modeling"
    - "Optimal Distribution of Computational Power in Free Viewpoint Interpolation by Depth Hypothesis Density Adaptation in Plane Sweeping"

Connected through hyperedge HE-2 (induced by source paper "Isometric registration of ambiguous and partial data"):
  with members:
    - "Partial 3-D Correspondence from Shape Extremities"

Connected through hyperedge HE-3 (induced by source paper "A new multiview spacetime-consistent depth recovery framework for free viewpoint video rendering"):
  with members:
    - "3D reconstruction of dynamic scenes with multiple handheld cameras"

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Mathematics