Recent studies extend the autoregression paradigm to text-to-image generation, achieving performance comparable to diffusion models. However, our new PairComp benchmark -- featuring test cases of paired prompts with similar syntax but different fine-grained semantics -- reveals that existing models struggle with fine-grained text-image alignment thus failing to realize precise control over visual tokens. To address this, we propose FocusDiff, which enhances fine-grained text-image semantic alignment by focusing on subtle differences between similar text-image pairs. We construct a new dataset of paired texts and images with similar overall expressions but distinct local semantics, further introducing a novel reinforcement learning algorithm to emphasize such fine-grained semantic differences for desired image generation. Our approach achieves state-of-the-art performance on existing text-to-image benchmarks and significantly outperforms prior methods on PairComp.
View on arXiv@article{pan2025_2506.05501,
title={ FocusDiff: Advancing Fine-Grained Text-Image Alignment for Autoregressive Visual Generation through RL },
author={ Kaihang Pan and Wendong Bu and Yuruo Wu and Yang Wu and Kai Shen and Yunfei Li and Hang Zhao and Juncheng Li and Siliang Tang and Yueting Zhuang },
journal={arXiv preprint arXiv:2506.05501},
year={ 2025 }
}