We introduce a new framework for learning dense correspondence between
deformable 3D shapes. Existing learning based approaches model shape
correspondence as a labelling problem, where each point of a query shape
receives a label identifying a point on some reference domain; the
correspondence is then constructed a posteriori by composing the label
predictions of two input shapes. We propose a paradigm shift and design a
structured prediction model in the space of functional maps, linear operators
that provide a compact representation of the correspondence. We model the
learning process via a deep residual network which takes dense descriptor
fields defined on two shapes as input, and outputs a soft map between the two
given objects. The resulting correspondence is shown to be accurate on several
challenging benchmarks comprising multiple categories, synthetic models, real
scans with acquisition artifacts, topological noise, and partiality.

该研究提出了一种新的学习框架，用于学习变形的 3D 形状之间的密集对应关系，通过使用一个在功能映射空间内的结构化预测模型，以及对两个形状定义的密集描述符场的输入和输出，得到在多个具有挑战性的基准测试中表现准确的对应关系。

深度功能映射：用于稠密形状对应关系的结构化预测

Deep Functional Maps: Structured Prediction for Dense Shape  Correspondence

Multidimensional scaling (MDS) is a family of methods that embed a given set
of points into a simple, usually flat, domain. The points are assumed to be
sampled from some metric space, and the mapping attempts to preserve the
distances between each pair of points in the set. Distances in the target space
can be computed analytically in this setting. Generalized MDS is an extension
that allows mapping one metric space into another, that is, multidimensional
scaling into target spaces in which distances are evaluated numerically rather
than analytically. Here, we propose an efficient approach for computing such
mappings between surfaces based on their natural spectral decomposition, where
the surfaces are treated as sampled metric-spaces. The resulting spectral-GMDS
procedure enables efficient embedding by implicitly incorporating smoothness of
the mapping into the problem, thereby substantially reducing the complexity
involved in its solution while practically overcoming its non-convex nature.
The method is compared to existing techniques that compute dense correspondence
between shapes. Numerical experiments of the proposed method demonstrate its
efficiency and accuracy compared to state-of-the-art approaches.

该研究提出了一种基于表面的谱广义多维尺度映射 (Spectral-GMDS) 方法，用于计算两个度量空间之间的映射关系，该方法在解决问题时隐含地将映射的平滑性纳入，从而实现了高效的嵌入，并在实验中取得了很好的效果。