# Learning to Authenticate with Deep Multibiometric Hashing and Neural Network Decoding

## TL;DR

This paper introduces a deep multibiometric hashing and neural decoding framework that enhances multimodal biometric authentication by improving feature fusion, binarization, and robustness against biometric variations.

## Contribution

The novel MDHND architecture combines deep hashing with neural network decoding for improved multimodal biometric authentication performance.

## Key findings

- Outperforms existing multimodal authentication systems on standard datasets.
- Effectively compensates for biometric variations like pose and illumination.
- Joint training of modules enhances overall system accuracy.

## Abstract

In this paper, we propose a novel multimodal deep hashing neural decoder (MDHND) architecture, which integrates a deep hashing framework with a neural network decoder (NND) to create an effective multibiometric authentication system. The MDHND consists of two separate modules: a multimodal deep hashing (MDH) module, which is used for feature-level fusion and binarization of multiple biometrics, and a neural network decoder (NND) module, which is used to refine the intermediate binary codes generated by the MDH and compensate for the difference between enrollment and probe biometrics (variations in pose, illumination, etc.). Use of NND helps to improve the performance of the overall multimodal authentication system. The MDHND framework is trained in 3 steps using joint optimization of the two modules. In Step 1, the MDH parameters are trained and learned to generate a shared multimodal latent code; in Step 2, the latent codes from Step 1 are passed through a conventional error-correcting code (ECC) decoder to generate the ground truth to train a neural network decoder (NND); in Step 3, the NND decoder is trained using the ground truth from Step 2 and the MDH and NND are jointly optimized. Experimental results on a standard multimodal dataset demonstrate the superiority of our method relative to other current multimodal authentication systems