Anomaly Detection for Hybrid Butterfly Subspecies via Probability Filtering

Detecting butterfly hybrids requires knowledge of the parent subspecies, and the process can be tedious when encountering a new subspecies. This study focuses on a specific scenario where a model trained to recognize hybrid species A can generalize to species B when B biologically mimics A. Since species A and B share similar patterns, we leverage BioCLIP as our feature extractor to capture features based on their taxonomy. Consequently, the algorithm designed for species A can be transferred to B, as their hybrid and non-hybrid patterns exhibit similar relationships. To determine whether a butterfly is a hybrid, we adopt proposed probability filtering and color jittering to augment and simulate the mimicry. With these approaches, we achieve second place in the official development phase. Our code is publicly available atthis https URL.

@article{ruan2025_2504.01671,
  title={ Anomaly Detection for Hybrid Butterfly Subspecies via Probability Filtering },
  author={ Bo-Kai Ruan and Yi-Zeng Fang and Hong-Han Shuai and Juinn-Dar Huang },
  journal={arXiv preprint arXiv:2504.01671},
  year={ 2025 }
}