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Recently, large vision-language models (LVLMs) have risen to be a promising approach for multimodal tasks. However, principled hallucination mitigation remains a critical challenge.In this work, we first analyze the data generation process…

Computer Vision and Pattern Recognition · Computer Science 2025-12-02 Chengzhi Yu , Yifan Xu , Yifan Chen , Wenyi Zhang

Direct Preference Optimization (DPO) has shown strong potential for mitigating hallucinations in Multimodal Large Language Models (MLLMs). However, existing multimodal DPO approaches often suffer from overfitting due to the difficulty…

Artificial Intelligence · Computer Science 2026-01-05 Longtian Qiu , Shan Ning , Chuyu Zhang , Jiaxuan Sun , Xuming He

Large vision-language models (LVLMs) suffer from hallucination, resulting in misalignment between the output textual response and the input visual content. Recent research indicates that the over-reliance on the Large Language Model (LLM)…

Computer Vision and Pattern Recognition · Computer Science 2024-11-06 Yuxi Xie , Guanzhen Li , Xiao Xu , Min-Yen Kan

Direct Preference Optimization (DPO) has emerged as an effective approach for mitigating hallucination in Multimodal Large Language Models (MLLMs). Although existing methods have achieved significant progress by utilizing vision-oriented…

Artificial Intelligence · Computer Science 2025-12-23 Wenqi Liu , Xuemeng Song , Jiaxi Li , Yinwei Wei , Na Zheng , Jianhua Yin , Liqiang Nie

Multimodal large language models have made significant advancements in recent years, yet they still suffer from a common issue known as the "hallucination problem", in which the models generate textual descriptions that inaccurately depict…

Computer Vision and Pattern Recognition · Computer Science 2024-02-07 Zhiyuan Zhao , Bin Wang , Linke Ouyang , Xiaoyi Dong , Jiaqi Wang , Conghui He

Multimodal Large Language Models (MLLMs) are known to hallucinate, which limits their practical applications. Recent works have attempted to apply Direct Preference Optimization (DPO) to enhance the performance of MLLMs, but have shown…

Computation and Language · Computer Science 2024-11-18 Yuhan Fu , Ruobing Xie , Xingwu Sun , Zhanhui Kang , Xirong Li

Preference alignment methods such as RLHF and Direct Preference Optimization (DPO) improve instruction following, but they can also reinforce hallucinations when preference judgments reward fluency and confidence over factual correctness.…

Computation and Language · Computer Science 2026-04-16 Sindhuja Chaduvula , Ahmed Y. Radwan , Azib Farooq , Yani Ioannou , Shaina Raza

Despite recent successes, LVLMs or Large Vision Language Models are prone to hallucinating details like objects and their properties or relations, limiting their real-world deployment. To address this and improve their robustness, we…

Computer Vision and Pattern Recognition · Computer Science 2024-08-21 Yassine Ouali , Adrian Bulat , Brais Martinez , Georgios Tzimiropoulos

Direct Preference Optimization (DPO) has emerged as a lightweight and effective alternative to Reinforcement Learning from Human Feedback (RLHF) and Reinforcement Learning with AI Feedback (RLAIF) for aligning large language and…

Artificial Intelligence · Computer Science 2025-12-16 Zihui Zhao , Zechang Li

Direct Preference Optimization (DPO) has shown effectiveness in aligning multi-modal large language models (MLLM) with human preferences. However, existing methods exhibit an imbalanced responsiveness to the data of varying hardness,…

Computer Vision and Pattern Recognition · Computer Science 2025-02-12 Jinda Lu , Junkang Wu , Jinghan Li , Xiaojun Jia , Shuo Wang , YiFan Zhang , Junfeng Fang , Xiang Wang , Xiangnan He

Hallucination remains a fundamental challenge in vision-language models (VLMs), where autoregressive generation may produce linguistically plausible yet physically inconsistent or visually ungrounded responses due to likelihood maximization…

Computer Vision and Pattern Recognition · Computer Science 2026-05-19 Qinwu Xu

Multimodal Large Reasoning Models introduce the reasoning paradigm, demonstrating strong capabilities on complex vision-language tasks. However, they still suffer from severe hallucinations. Existing training-based methods typically…

Artificial Intelligence · Computer Science 2026-05-28 Jiawei Kong , Hao Fang , Shunxiang Liao , Jinyu Li , Bin Chen , Hao Wu , Shu-Tao Xia , Min Zhang

Large Vision-Language Models (LVLMs) frequently suffer from hallucinations. Existing preference learning-based approaches largely rely on proprietary models to construct preference datasets. We identify that this reliance introduces a…

Artificial Intelligence · Computer Science 2026-04-28 Byeonggeuk Lim , JungMin Yun , Junehyoung Kwon , Kyeonghyun Kim , YoungBin Kim

Direct Preference Optimization (DPO) helps reduce hallucinations in Video Multimodal Large Language Models (VLLMs), but its reliance on offline preference data limits adaptability and fails to capture true video-response misalignment. We…

Computer Vision and Pattern Recognition · Computer Science 2025-04-16 Xinpeng Ding , Kui Zhang , Jianhua Han , Lanqing Hong , Hang Xu , Xiaomeng Li

Direct Preference Optimization (DPO) has been demonstrated to be highly effective in mitigating hallucinations in Large Vision Language Models (LVLMs) by aligning their outputs more closely with human preferences. Despite the recent…

Computer Vision and Pattern Recognition · Computer Science 2025-09-24 Jihao Gu , Yingyao Wang , Meng Cao , Pi Bu , Jun Song , Yancheng He , Shilong Li , Bo Zheng

Large Vision-Language Models (LVLMs) hold significant promise for medical applications, yet their deployment is often constrained by insufficient alignment and reliability. While Direct Preference Optimization (DPO) has emerged as a potent…

Computer Vision and Pattern Recognition · Computer Science 2026-01-27 Dain Kim , Jiwoo Lee , Jaehoon Yun , Yong Hoe Koo , Qingyu Chen , Hyunjae Kim , Jaewoo Kang

Direct Preference Optimization (DPO) has proven to be an effective solution for mitigating hallucination in Multimodal Large Language Models (MLLMs) by learning from preference pairs. One of its key challenges lies in how to transfer the…

Machine Learning · Computer Science 2026-05-07 Huatian Zhang , Zhendong Mao , Lei Zhang , Yongdong Zhang

Despite their significant advancements, Multimodal Large Language Models (MLLMs) often generate factually inaccurate information, referred to as hallucination. In this work, we address object hallucinations in MLLMs, where information is…

Computer Vision and Pattern Recognition · Computer Science 2025-03-03 Pritam Sarkar , Sayna Ebrahimi , Ali Etemad , Ahmad Beirami , Sercan Ö. Arık , Tomas Pfister

Direct Preference Optimization (DPO) is a powerful paradigm for aligning Large Language Models (LLMs) to human preferences in Machine Translation (MT), but current methods are hindered by two fundamental challenges: (1) flawed reward…

Computation and Language · Computer Science 2025-10-16 Hao Wang , Linlong Xu , Heng Liu , Yangyang Liu , Xiaohu Zhao , Bo Zeng , Liangying Shao , Longyue Wang , Weihua Luo , Kaifu Zhang

Multimodal Large Language Models (MLLMs) emerge as a unified interface to address a multitude of tasks, ranging from NLP to computer vision. Despite showcasing state-of-the-art results in many benchmarks, a long-standing issue is the…

Computer Vision and Pattern Recognition · Computer Science 2025-08-29 Alberto Compagnoni , Davide Caffagni , Nicholas Moratelli , Lorenzo Baraldi , Marcella Cornia , Rita Cucchiara
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