# A Deep Four-Stream Siamese Convolutional Neural Network with Joint Verification and Identification Loss for Person Re-detection

## TL;DR

This paper introduces a four-stream Siamese CNN for person re-identification that jointly optimizes verification and identification losses, outperforming triplet-based methods and achieving state-of-the-art results on multiple datasets.

## Contribution

The paper presents a novel four-image group approach with joint loss optimization, improving generalization and discriminative feature learning in person re-identification.

## Key findings

- Achieves state-of-the-art performance on VIPeR, CUHK01, CUHK03, and PRID2011 datasets.
- Outperforms triplet-based deep networks in person re-identification tasks.
- Effectively reduces intra-class variation and increases inter-class variation.

## Abstract

State-of-the-art person re-identification systems that employ a triplet based deep network suffer from a poor generalization capability. In this paper, we propose a four stream Siamese deep convolutional neural network for person redetection that jointly optimises verification and identification losses over a four image input group. Specifically, the proposed method overcomes the weakness of the typical triplet formulation by using groups of four images featuring two matched (i.e. the same identity) and two mismatched images. This allows us to jointly increase the interclass variations and reduce the intra-class variations in the learned feature space. The proposed approach also optimises over both the identification and verification losses, further minimising intra-class variation and maximising inter-class variation, improving overall performance. Extensive experiments on four challenging datasets, VIPeR, CUHK01, CUHK03 and PRID2011, demonstrates that the proposed approach achieves state-of-the-art performance.