Feature-based Image Matching for Identifying Individual K\=ak\=a

TL;DR

This paper presents an unsupervised, feature-based image matching pipeline for identifying individual kakas, addressing limitations of supervised methods by effectively handling new individuals through local feature extraction and similarity scoring.

Contribution

The study introduces an unsupervised image matching approach using local features and similarity networks for individual identification, offering an alternative to supervised methods.

Findings

High accuracy in true match identification

Effective handling of new individuals in population

Potential for unsupervised identification methods

Abstract

This report investigates an unsupervised, feature-based image matching pipeline for the novel application of identifying individual k\=ak\=a. Applied with a similarity network for clustering, this addresses a weakness of current supervised approaches to identifying individual birds which struggle to handle the introduction of new individuals to the population. Our approach uses object localisation to locate k\=ak\=a within images and then extracts local features that are invariant to rotation and scale. These features are matched between images with nearest neighbour matching techniques and mismatch removal to produce a similarity score for image match comparison. The results show that matches obtained via the image matching pipeline achieve high accuracy of true matches. We conclude that feature-based image matching could be used with a similarity network to provide a viable alternative to existing supervised approaches.