针对光固化制造中零件质量检测难题,提出可自适应更新的少样本学习框架。
Adaptive few-shot learning for robust part quality classification in two-photon lithography
- 基于LDA统计检验实现新缺陷类型自动识别
- 仅用20样本即可将新缺陷类准确率提升至92%
- 仅5样本即跨域适配精度达96.19%,适合动态产线
双光子光刻(TPL)是一种高精度微结构增材制造技术。尽管计算机视觉(CV)已被证明可用于自动化质量控制,但现有模型通常为静态设计,在动态制造环境中表现不佳。这些模型难以识别新出现的缺陷类别,无法从稀缺数据高效更新,也难以适应新的零件几何形状。为此,本文提出一个贯穿全生命周期的质量模型维护自适应框架。该框架基于统一的尺度鲁棒骨干模型,集成三项关键技术:(1)基于线性判别分析(LDA)的统计假设检验框架用于新奇性检测;(2)两阶段、基于回放的少样本增量学习策略;(3)少样本领域对抗神经网络(DANN)用于少样本域适应。在包含半球(源域)与立方体(目标域)结构的TPL数据集上评估,每个域分为良品、轻微损伤和损坏三类。假设检验方法对新类别批次的识别准确率达99%-100%。增量学习方法仅用K=20样本即可实现92%的准确率。域适应模型在严重域偏移下,仅用K=5样本即在目标域达到96.19%的准确率。结果表明,该方案在演化生产场景中具备强鲁棒性和数据高效性。
原文摘要 · Abstract (English)
Two-photon lithography (TPL) is an advanced additive manufacturing (AM) technique for fabricating high-precision micro-structures. While computer vision (CV) is proofed for automated quality control, existing models are often static, rendering them ineffective in dynamic manufacturing environments. These models typically cannot detect new, unseen defect classes, be efficiently updated from scarce data, or adapt to new part geometries. To address this gap, this paper presents an adaptive CV framework for the entire life-cycle of quality model maintenance. The proposed framework is built upon a same, scale-robust backbone model and integrates three key methodologies: (1) a statistical hypothesis testing framework based on Linear Discriminant Analysis (LDA) for novelty detection, (2) a two-stage, rehearsal-based strategy for few-shot incremental learning, and (3) a few-shot Domain-Adversarial Neural Network (DANN) for few-shot domain adaptation. The framework was evaluated on a TPL dataset featuring hemisphere as source domain and cube as target domain structures, with each domain categorized into good, minor damaged, and damaged quality classes. The hypothesis testing method successfully identified new class batches with 99-100% accuracy. The incremental learning method integrated a new class to 92% accuracy using only K=20 samples. The domain adaptation model bridged the severe domain gap, achieving 96.19% accuracy on the target domain using only K=5 shots. These results demonstrate a robust and data-efficient solution for deploying and maintaining CV models in evolving production scenarios.
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