Cross-modal Variational Alignment of Latent Spaces
Thomas Theodoridis, Theocharis Chatzis, V. Solachidis, Kosmas Dimitropoulos, Petros Daras
Abstract
In this paper, we propose a novel cross-modal variational alignment method in order to process and relate information across different modalities. The proposed approach consists of two variational autoencoder (VAE) networks which generate and model the latent space of each modality. The first network is a multi modal variational autoencoder that maps directly one modality to the other, while the second one is a single-modal variational autoencoder. In order to associate the two spaces, we apply variational alignment, which acts as a translation mechanism that projects the latent space of the first VAE onto the one of the single-modal VAE through an intermediate distribution. Experimental results on four well-known datasets, covering two different application domains (food image analysis and 3D hand pose estimation), show the generality of the proposed method and its superiority against a number of state-of-the-art approaches.