Training-free Conditional Image Embedding Framework Leveraging Large Vision Language Models

Masayuki Kawarada; Kosuke Yamada; Antonio Tejero-de-Pablos; Naoto Inoue

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arXiv · 2512.21860

Training-free Conditional Image Embedding Framework Leveraging Large Vision Language Models

Masayuki Kawarada·Kosuke Yamada·Antonio Tejero-de-Pablos·Naoto Inoue

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Abstract

Conditional image embeddings are feature representations that focus on specific aspects of an image indicated by a given textual condition (e.g., color, genre), which has been a challenging problem. Although recent vision foundation models, such as CLIP, offer rich representations of images, they are not designed to focus on a specified condition. In this paper, we propose DIOR, a method that leverages a large vision-language model (LVLM) to generate conditional image embeddings. DIOR is a training-free approach that prompts the LVLM to describe an image with a single word related to a given condition. The hidden state vector of the LVLM's last token is then extracted as the conditional image embedding. DIOR provides a versatile solution that can be applied to any image and condition without additional training or task-specific priors. Comprehensive experimental results on conditional image similarity tasks demonstrate that DIOR outperforms existing training-free baselines, including CLIP. Furthermore, DIOR achieves superior performance compared to methods that require additional training across multiple settings.

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Masayuki Kawarada, Kosuke Yamada, Antonio Tejero-de-Pablos, Naoto Inoue. 2025-12-26. Training-free Conditional Image Embedding Framework Leveraging Large Vision Language Models. https://arxiv.org/abs/2512.21860

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