Robert Herzog, Daniel Mewes, Michael Wand, Leonidas Guibas and Hans-Peter Seidel. LeSSS: Learned Shared Semantic Spaces for Relating Multi-Modal Representations of 3D Shapes. Eurographics Forum (Proc. Symp. Geom. Processing), 34(5), pp. 141-151, 2015.


In this paper, we propose a new method for structuring multi-modal representations of shapes according to semantic relations. We learn a metric that links semantically similar objects represented in different modalities. First, 3D-shapes are associated with textual labels by learning how textual attributes are related to the observed geometry. Correlations between similar labels are captured by simultaneously embedding labels and shape descriptors into a common latent space in which an inner product corresponds to similarity. The mapping is learned robustly by optimizing a rank-based loss function under a sparseness prior for the spectrum of the matrix of all classifiers. Second, we extend this framework towards relating multi-modal representations of the geometric objects. The key idea is that weak cues from shared human labels are sufficient to obtain a consistent embedding of related objects even though their representations are not directly comparable. We evaluate our method against common base-line approaches, investigate the influence of different geometric descriptors, and demonstrate a prototypical multi-modal browser that relates 3D-objects with text, photographs, and 2D line sketches.


  author       = {Herzog, Robert and Mewes, Daniel and Wand, Michael and Guibas, Leonidas and Seidel, Hans-Peter},
  title        = {LeSSS: Learned Shared Semantic Spaces for Relating Multi-Modal Representations of 3D Shapes},
  journal    = {Computer Graphics Forum},
  year         = {2015},
  volume       = {34},
  number       = {5},
  pages        = {141--151},
  organization = {Wiley Online Library},