From Descriptive Richness To Bias: Unveiling The Dark Side Of Generative Image Caption Enrichment

Hirota Yusuke, Hachiuma Ryo, Yang Chao-han Huck, Nakashima Yuta. Arxiv 2024

[Paper]    
Ethics And Bias Multimodal Models RAG

Large language models (LLMs) have enhanced the capacity of vision-language models to caption visual text. This generative approach to image caption enrichment further makes textual captions more descriptive, improving alignment with the visual context. However, while many studies focus on benefits of generative caption enrichment (GCE), are there any negative side effects? We compare standard-format captions and recent GCE processes from the perspectives of “gender bias” and “hallucination”, showing that enriched captions suffer from increased gender bias and hallucination. Furthermore, models trained on these enriched captions amplify gender bias by an average of 30.9% and increase hallucination by 59.5%. This study serves as a caution against the trend of making captions more descriptive.

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