用物理感知的Swin Transformer提升全息成像质量,有效抑制伪影。
HoloPASWIN: Robust Inline Holographic Reconstruction via Physics-Aware Swin Transformers
- 基于Swin Transformer的分层窗口注意力捕捉全息图全局与局部特征。
- 在2.5万张合成数据上实现高质量重建,对多种噪声具有鲁棒性。
- 适合需要高精度、抗干扰全息成像的科研与工业应用。
透射式数字全息(DIH)是一种无透镜成像技术,具有结构简单、通量高的优点。但记录过程仅捕获干涉图样的强度,导致出现交叉项和孪生像等伪影。虽然交叉项可通过调节参考光强抑制,孪生像问题仍存在——它是频谱伪影,将一个未聚焦的共轭波叠加到重建物体上,严重降低图像质量。尽管深度学习在相位恢复中表现突出,传统卷积神经网络(CNN)受限于局部感受野,难以捕捉全息中的全局衍射模式。本文提出HoloPASWIN,一种基于Swin Transformer架构的物理感知深度学习框架。通过分层移位窗口注意力机制,模型能高效捕捉全息重建所需的局部细节与长程依赖。设计了包含频域约束与物理一致性(通过可微分角谱传播器实现)的综合损失函数,确保高谱保真度。在包含25,000个样本的大型合成数据集上验证,覆盖多种噪声配置(斑点噪声、散粒噪声、读出噪声和暗电流噪声),结果显示该方法有效抑制孪生像并保持鲁棒的重建质量。
原文摘要 · Abstract (English)
In-line digital holography (DIH) is a widely used lensless imaging technique, valued for its simplicity and capability to image samples at high throughput. However, capturing only intensity of the interference pattern during the recording process gives rise to some unwanted terms such as cross-term and twin-image. The cross-term can be suppressed by adjusting the intensity of reference wave, but the twin-image problem remains. The twin-image is a spectral artifact that superimposes a defocused conjugate wave onto the reconstructed object, severely degrading image quality. While deep learning has recently emerged as a powerful tool for phase retrieval, traditional Convolutional Neural Networks (CNNs) are limited by their local receptive fields, making them less effective at capturing the global diffraction patterns inherent in holography. In this study, we introduce HoloPASWIN, a physics-aware deep learning framework based on the Swin Transformer architecture. By leveraging hierarchical shifted-window attention, our model efficiently captures both local details and long-range dependencies essential for accurate holographic reconstruction. We propose a comprehensive loss function that integrates frequency-domain constraints with physical consistency via a differentiable angular spectrum propagator, ensuring high spectral fidelity. Validated on a large-scale synthetic dataset of 25,000 samples with diverse noise configurations (speckle, shot, read, and dark noise), HoloPASWIN demonstrates effective twin-image suppression and robust reconstruction quality.
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