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arXiv 2603.10210cs.CVcs.AI

Delta-K: 通过交叉注意力增强提升多实例生成

Delta-K: Boosting Multi-Instance Generation via Cross-Attention Augmentation

School of Software Engineering, Sun Yat-sen University(中山大学软件学院);Nanjing University(南京大学);College of Management and Economics, Tianjin University(天津大学管理学院)

Zitong Wang, Zijun Shen, Haohao Xu, Zhengjie Luo, Weibin Wu

AI总结:

Delta-K通过在交叉注意力键空间中直接操作,解决扩散模型在多实例生成中的概念遗漏问题,提升生成质量且无需额外训练或架构修改。

摘要:

尽管扩散模型在文本到图像合成方面表现出色,但在合成复杂多实例场景时常常出现概念遗漏的问题。现有无训练方法试图通过重新缩放注意力图来解决这一问题,但这种方法只是加剧了无结构噪声,而未能建立连贯的语义表示。为了解决这一问题,我们提出了Delta-K,一种背骨无关且即插即用的推理框架,通过在共享的交叉注意力键空间中直接操作来解决遗漏问题。具体来说,利用视觉语言模型,我们提取了一个差分键ΔK,该键编码了缺失概念的语义特征。此信号随后在扩散过程的早期语义规划阶段被注入。由动态优化的调度机制所引导,Delta-K将扩散噪声稳定地锚定在稳定的结构锚点上,同时保留现有概念。广泛的实验表明,我们的方法具有广泛的通用性:Delta-K在现代DiT模型和经典U-Net架构中都能一致地提高组合对齐度,无需空间掩码、额外训练或架构修改。

英文摘要:

While Diffusion Models excel in text-to-image synthesis, they frequently suffer from catastrophic concept omission when generating complex multi-instance scenes. Existing training-free methods attempt to resolve this by rescaling attention maps, which merely exacerbates unstructured noise without establishing coherent semantic representations. To address this, we propose Delta-K, a backbone-agnostic, plug-and-play inference framework that resolves omission by operating directly in the shared cross-attention Key space. Utilizing a lightweight Vision-Language Model (VLM) preview, we isolate a differential key ($ΔK$) capturing the pure semantic signature of missing concepts, and proactively inject it during the early semantic planning phase. Governed by a dynamically optimized scheduling mechanism, Delta-K grounds diffuse noise into stable structural anchors while naturally preserving existing concepts via the inherent orthogonality of $ΔK$. Extensive experiments validate its universal applicability, demonstrating that Delta-K significantly improves compositional alignment across both modern DiT and foundational U-Net architectures without requiring spatial masks, auxiliary training, or structural modifications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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