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Category-based Galaxy Image Generation via Diffusion Models

delete2026-04-02
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OA
AI
X
Xingzhong Fan
H
Hongming Tang
Y
Yue Zeng
M
M. B. N. Kouwenhoven
G
Guangquan Zeng
DOI:10.3847/1538-3881/ae5064delete
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摘要

摘要

En 中文
传统星系图像生成方法依赖半解析模型和流体动力学模拟,这些方法高度依赖于物理假设和参数调优。相比之下,数据驱动的生成模型没有预先设定的显式物理参数,而是从观测数据中高效学习这些参数,从而成为星系生成的替代方案。其中,扩散模型在生成质量和多样性方面优于变分自编码器和生成对抗网络。嵌入广义物理特征(如类别信息)可进一步增强其生成能力。在本工作中,我们提出GalCatDiff,这是天文学领域首个在扩散模型网络设计中同时利用星系图像特征和天体物理属性的框架。GalCatDiff整合了增强型U-Net和一个名为Astro-RAB(残差注意力块)的新模块,该模块通过动态结合注意力机制与卷积运算来确保全局一致性和局部特征保真度。此外,GalCatDiff采用类别嵌入实现特定类别星系的生成,避免了为每个类别训练独立模型的高计算成本。实验结果表明,GalCatDiff在样本颜色和尺寸分布的一致性方面显著优于现有方法,且生成的星系在视觉上逼真且物理上合理。该框架将提升星系模拟的可靠性,并可作为数据增强器支持未来星系分类算法的开发。
Keyword:
Galaxy image generation
Diffusion models
Category embeddings
Astrophysical properties
U-Net
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The Astronomical Journal
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university of illinois
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errStrateva, I; Ivezic, Z; Knapp, GR; Narayanan, VK; Strauss, MA; Gunn, JE; Lupton, RH; Schlegel, D; Bahcall, NA; Brinkmann, J; Brunner, RJ; Budavári, T; Csabai, I; Castander, FJ; Doi, M; Fukugita, M; Györy, Z; Hamabe, M; Hennessy, G; Ichikawa, T; Kunszt, PZ; Lamb, DQ; McKay, TA; Okamura, S; Racusin, J; Sekiguchi, M; Schneider, DP; Shimasaku, K; York, D
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