arXiv:2510.26907cond-mat.mtrl-scics.CV2025-10

用生成模型修复高速采集的电子衍射图像,提升晶体取向分析精度。

Generative diffusion modeling protocols for improving the Kikuchi pattern indexing in electron back-scatter diffraction

  • 基于扩散模型生成修复噪声的电子背散射衍射图
  • 在短曝光下仍能显著提升衍射图质量与索引准确率
  • 无需大量数据即可训练,适合实际高速扫描场景

电子背散射衍射(EBSD)传统上依赖霍夫变换和字典索引法解析衍射图并提取晶格取向。但在高扫描速度下,单个图案曝光时间缩短,超出CCD相机灵敏度范围,导致信噪比下降,衍射图噪声严重,索引精度降低。本文研究开发生成式机器学习模型,用于对高速扫描下获取的噪声衍射图进行后处理或实时修复,恢复高质量图案以实现可靠的晶体取向分析。对比了多种生成模型在短曝光条件下的表现,发现该方法不依赖大规模数据,具备良好实用性。

原文摘要 · Abstract (English)

Electron back-scatter diffraction (EBSD) has traditionally relied upon methods such as the Hough transform and dictionary Indexing to interpret diffraction patterns and extract crystallographic orientation. However, these methods encounter significant limitations, particularly when operating at high scanning speeds, where the exposure time per pattern is decreased beyond the operating sensitivity of CCD camera. Hence the signal to noise ratio decreases for the observed pattern which makes the pattern noisy, leading to reduced indexing accuracy. This research work aims to develop generative machine learning models for the post-processing or on-the-fly processing of Kikuchi patterns which are capable of restoring noisy EBSD patterns obtained at high scan speeds. These restored patterns can be used for the determination of crystal orientations to provide reliable indexing results. We compare the performance of such generative models in enhancing the quality of patterns captured at short exposure times (high scan speeds). An interesting observation is that the methodology is not data-hungry as typical machine learning methods.

电子衍射生成模型图像修复晶体取向

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