arXiv:2511.16717cs.CVcs.AI2025-11

用无监督网络消除聚变成像中的混合噪声,提升重建精度。

A Machine Learning-Driven Solution for Denoising Inertial Confinement Fusion Images

  • 设计含CDF 97小波的自编码器,专攻混合高斯-泊松噪声。
  • 在真实与模拟数据上,重构误差更低且边缘保留更优。
  • 为全链路AI重建提供关键起点,适合聚变诊断研究者。

中子成像对国家点火装置(NIF)惯性约束聚变(ICF)内爆诊断与优化至关重要。由于需达到10微米分辨率,成像需通过迭代算法重建。对于低产额源,图像常受多种噪声干扰,高斯噪声与泊松噪声共存,掩盖细节并模糊源信息所在边缘。传统去噪方法如滤波和阈值处理可能误改关键特征或改变噪声统计,影响迭代重建最终保真度。近年来,合成数据生成与机器学习的进步为解决此问题带来新机遇。本研究提出一种无监督自编码器,其潜在空间引入Cohen-Daubechies-Feauveau(CDF 97)小波变换,旨在抑制混合高斯-泊松噪声的同时保留关键图像特征。该网络成功去噪中子成像数据。在仿真与实验的NIF数据集上对比测试表明,该方法重构误差低于传统滤波方法(如块匹配与3D滤波,BM3D),且边缘保持性能更优。验证了无监督学习在中子图像去噪中的有效性,为实现完全端到端的AI驱动重建框架奠定了关键第一步。

原文摘要 · Abstract (English)

Neutron imaging is essential for diagnosing and optimizing inertial confinement fusion implosions at the National Ignition Facility. Due to the required 10-micrometer resolution, however, neutron image require image reconstruction using iterative algorithms. For low-yield sources, the images may be degraded by various types of noise. Gaussian and Poisson noise often coexist within one image, obscuring fine details and blurring the edges where the source information is encoded. Traditional denoising techniques, such as filtering and thresholding, can inadvertently alter critical features or reshape the noise statistics, potentially impacting the ultimate fidelity of the iterative image reconstruction pipeline. However, recent advances in synthetic data production and machine learning have opened new opportunities to address these challenges. In this study, we present an unsupervised autoencoder with a Cohen-Daubechies- Feauveau (CDF 97) wavelet transform in the latent space, designed to suppress for mixed Gaussian-Poisson noise while preserving essential image features. The network successfully denoises neutron imaging data. Benchmarking against both simulated and experimental NIF datasets demonstrates that our approach achieves lower reconstruction error and superior edge preservation compared to conventional filtering methods such as Block-matching and 3D filtering (BM3D). By validating the effectiveness of unsupervised learning for denoising neutron images, this study establishes a critical first step towards fully AI-driven, end-to-end reconstruction frameworks for ICF diagnostics.

图像去噪聚变诊断自编码器小波变换

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