Mitigating Action-Relation Hallucinations in LVLMs via Relation-aware Visual Enhancement
For LVLM developers and users, this work mitigates a specific type of hallucination (action-relation) that was previously underexplored, though the method is incremental as it builds on existing attention mechanisms.
The paper addresses action-relation hallucinations in Large Vision-Language Models (LVLMs), where generated text contradicts visual input regarding interactions between objects. The proposed Relation-aware Visual Enhancement (RVE) method reduces such hallucinations by enhancing attention to action-relevant image regions, achieving superior performance over baselines with negligible additional cost.
Large Vision-Language Models (LVLMs) have achieved remarkable performance on diverse vision-language tasks. However, LVLMs still suffer from hallucinations, generating text that contradicts the visual input. Existing research has primarily focused on mitigating object hallucinations, but often overlooks more complex relation hallucinations, particularly action relations involving interactions between objects. In this study, we empirically observe that the primary cause of action-relation hallucinations in LVLMs is the insufficient attention allocated to visual information. Thus, we propose a framework to locate action-relevant image regions and enhance the LVLM's attention to those regions. Specifically, we define the Action-Relation Sensitivity (ARS) score to identify attention heads that are most sensitive to action-relation changes, thereby localizing action-relevant image regions that contain key visual cues. Then, we propose the Relation-aware Visual Enhancement (RVE) method to enhance the LVLM's attention to these action-relevant image regions. Extensive experiments demonstrate that, compared to existing baselines, our method achieves superior performance in mitigating action-relation hallucinations with negligible additional inference cost. Furthermore, it effectively generalizes to spatial-relation hallucinations and object hallucinations.