Camera On-boarding for Person Re-identification using Hypothesis Transfer Learning

TL;DR

This paper introduces a privacy-preserving, transfer learning-based method for adapting person re-identification models to new cameras in a network without needing access to previous camera data, enhancing flexibility and privacy.

Contribution

Develops a novel hypothesis transfer learning approach for camera onboarding in person re-identification that avoids using source camera data, addressing privacy concerns.

Findings

Outperforms state-of-the-art methods on four benchmark datasets.

Effectively adapts to new cameras with limited labeled data.

Reduces negative transfer through optimal model combination.

Abstract

Most of the existing approaches for person re-identification consider a static setting where the number of cameras in the network is fixed. An interesting direction, which has received little attention, is to explore the dynamic nature of a camera network, where one tries to adapt the existing re-identification models after on-boarding new cameras, with little additional effort. There have been a few recent methods proposed in person re-identification that attempt to address this problem by assuming the labeled data in the existing network is still available while adding new cameras. This is a strong assumption since there may exist some privacy issues for which one may not have access to those data. Rather, based on the fact that it is easy to store the learned re-identifications models, which mitigates any data privacy concern, we develop an efficient model adaptation approach using hypothesis transfer learning that aims to transfer the knowledge using only source models and limited labeled data, but without using any source camera data from the existing network. Our approach minimizes the effect of negative transfer by finding an optimal weighted combination of multiple source models for transferring the knowledge. Extensive experiments on four challenging benchmark datasets with a variable number of cameras well demonstrate the efficacy of our proposed approach over state-of-the-art methods.