用共识矩阵引导自修正,提升非专家标注下细胞分割的准确性。
CASC-AI: Consensus-aware Self-corrective Learning for Noise Cell Segmentation
- 通过共识矩阵识别高置信度区域,强化其监督信号。
- 基于特征相似性动态加权分歧区域,减少误报与漏报。
- 适合医学图像中低质量标注数据的模型训练,尤其适用于非专家标注场景。
高分辨率全景切片图像(WSIs)中的多类别细胞分割对临床应用至关重要。然而,训练此类模型通常需要领域专家进行耗时的像素级标注。近期研究通过引入无医学背景的普通标注者降低了门槛。但传统非修正方法难以自适应处理标注噪声,缺乏在图像特征和像素层面抑制假阳性(FP)与假阴性(FN)的机制。本文提出一种共识感知的自修正AI代理,利用共识矩阵指导学习过程。该矩阵定义了AI与标注者在细胞与非细胞标注上一致的区域,优先给予更强监督。分歧区域则根据其与高置信度共识区域的特征相似性进行自适应加权,相似度越高,关注度越大。此外,采用对比学习分离噪声区域与可靠共识区域的特征,最大化二者差异。该范式使模型能迭代修正噪声标签,增强鲁棒性。在一份真实世界普通标注细胞数据集及两个推理引导的模拟噪声数据集上验证,本方法显著提升分割性能,有效纠正FP与FN错误,展现出在噪声数据上训练鲁棒模型的潜力。官方实现与标注数据已公开于 https://github.com/ddrrnn123/CASC-AI。
原文摘要 · Abstract (English)
Multi-class cell segmentation in high-resolution gigapixel whole slide images (WSIs) is crucial for various clinical applications. However, training such models typically requires labor-intensive, pixel-wise annotations by domain experts. Recent efforts have democratized this process by involving lay annotators without medical expertise. However, conventional non-corrective approaches struggle to handle annotation noise adaptively because they lack mechanisms to mitigate false positives (FP) and false negatives (FN) at both the image-feature and pixel levels. In this paper, we propose a consensus-aware self-corrective AI agent that leverages the Consensus Matrix to guide its learning process. The Consensus Matrix defines regions where both the AI and annotators agree on cell and non-cell annotations, which are prioritized with stronger supervision. Conversely, areas of disagreement are adaptively weighted based on their feature similarity to high-confidence consensus regions, with more similar regions receiving greater attention. Additionally, contrastive learning is employed to separate features of noisy regions from those of reliable consensus regions by maximizing their dissimilarity. This paradigm enables the model to iteratively refine noisy labels, enhancing its robustness. Validated on one real-world lay-annotated cell dataset and two reasoning-guided simulated noisy datasets, our method demonstrates improved segmentation performance, effectively correcting FP and FN errors and showcasing its potential for training robust models on noisy datasets. The official implementation and cell annotations are publicly available at https://github.com/ddrrnn123/CASC-AI.
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