Enhance Feature Discrimination For Unsupervised Hashing

Hoang Tuan, Do Thanh-toan, Tan Dang-khoa Le, Cheung Ngai-man. Arxiv 2017

[Paper]    
ARXIV Quantisation Unsupervised

We introduce a novel approach to improve unsupervised hashing. Specifically, we propose a very efficient embedding method: Gaussian Mixture Model embedding (Gemb). The proposed method, using Gaussian Mixture Model, embeds feature vector into a low-dimensional vector and, simultaneously, enhances the discriminative property of features before passing them into hashing. Our experiment shows that the proposed method boosts the hashing performance of many state-of-the-art, e.g. Binary Autoencoder (BA) [1], Iterative Quantization (ITQ) [2], in standard evaluation metrics for the three main benchmark datasets.

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