Exploring Clustering Capability of Inpainting Model Embeddings for Pattern-based Individual Identification

arXiv (Cornell University)

Abstract

In this paper, we explore deep learning techniques for individual identification of animals based on their skin patterns. Individual identification is crucial in biodiversity monitoring, since it enables analysis of decline or growth of populations, or intra-species interactions within populations. Models trained for the task of individual identification often do not focus on the skin pattern of animals, but on background details or body shape details. These characteristics are not individually specific, or can change drastically through time. We focus on techniques that will make machine learning models more responsive to skin pattern structure when extracting individual visual embeddings from images. For this, we explore image inpainting of task-specific masks as an auxiliary task to enhance ML-based individual identification from animal skin patterns. We propose a comparative analysis among four models as an encoder backbone for the individual identification task. We focus on the case study of zebrafish, which is a widely recognized biological model organism, and which exhibits individually identifying skin patterns. To evaluate encoder backbone performance, we present standard metrics for classification accuracy, embedding clustering metrics, and GradCAM visualizations.

Authors 4

1. Jens van Bijsterveld Aachen Leiden Institute of Advanced Computer Science Naturalis Biodiversity Center

   Leiden University · Naturalis Biodiversity Center

   Affiliation as printed

   Leiden Institute of Advanced Computer Science , Leiden University , Leiden , The Netherlands

   Naturalis Biodiversity Center , Leiden , The Netherlands

2. Daniele Avitabile

   Vrije Universiteit Amsterdam

   Affiliation as printed

   Department of Mathematics , Vrije Universiteit , Amsterdam , The Netherlands

3. Fons J. Verbeek
4. Rita Pucci Aachen Naturalis Biodiversity Center

   Naturalis Biodiversity Center

   Affiliation as printed

   Naturalis Biodiversity Center , Leiden , The Netherlands