Zero-Shot Visual Recognition via Bidirectional Latent Embedding

Qian Wang, Ke Chen

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Abstract

Zero-shot learning for visual recognition, e.g.,
object and action recognition, has recently attracted a lot
of attention. However, it still remains challenging in bridging
the semantic gap between visual features and their underlying
semantics and transferring knowledge to semantic
categories unseen during learning. Unlike most of the existing
zero-shot visual recognition methods, we propose a
stagewise bidirectional latent embedding framework to two
subsequent learning stages for zero-shot visual recognition.
In the bottom-up stage, a latent embedding space is first
created by exploring the topological and labeling information
underlying training data of known classes via a proper
supervised subspace learning algorithm and the latent embedding
of training data are used to form landmarks that
guide embedding semantics underlying unseen classes into
this learned latent space. In the top-down stage, semantic
representations of unseen-class labels in a given label vocabulary
are then embedded to the same latent space to preserve
the semantic relatedness between all different classes
via our proposed semi-supervised Sammon mapping with
the guidance of landmarks. Thus, the resultant latent embedding
space allows for predicting the label of a test instance
with a simple nearest-neighbor rule. To evaluate the effectiveness
of the proposed framework, we have conducted extensive
experiments on four benchmark datasets in object
and action recognition, i.e., AwA, CUB-200-2011, UCF101
and HMDB51. The experimental results under comparative
studies demonstrate that our proposed approach yields the
state-of-the-art performance under inductive and transductive
settings.
Original languageEnglish
Pages (from-to)356-383
Number of pages27
JournalInternational Journal of Computer Vision
Volume124
Issue number3
DOIs
Publication statusPublished - 28 Jun 2017

Keywords

  • Zero-shot learning
  • Object recognition
  • Human action recognition
  • Supervised locality preserving projection
  • Landmark-based Sammon mapping
  • multiple visual and semantic representations

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