Recognition: no theorem link
RABC-Net: Reliability-Aware Annotation-Free Skin Lesion Segmentation for Low-Resource Dermoscopy
Pith reviewed 2026-05-10 19:03 UTC · model grok-4.3
The pith
RABC-Net achieves competitive skin lesion segmentation accuracy on dermoscopy images without any manual pixel-level annotations for training or adaptation.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
RABC-Net decouples reliability learning from deployment by shaping representations through uncertainty-aware pseudo-label interaction during training, then applies Reliability-Adaptive Boundary Calibration in logit space from boundary confidence, uncertainty, and foreground probability, all without manual masks in training or adaptation, yielding the reported scores and an image-only inference path at 87.4 FPS.
What carries the argument
Reliability-Adaptive Boundary Calibration (RABC) that performs local logit-space calibration using boundary confidence, uncertainty estimates, and foreground probability to refine outputs after the base model processes an image.
Load-bearing premise
Uncertainty-aware pseudo-label interaction during training produces robust representations that transfer to new images without accumulating confirmation bias or errors.
What would settle it
Retraining the model on one dataset with the exact unlabeled procedure and testing on a separate held-out dermoscopy collection yields substantially lower DICE than 86.58 percent.
Figures
read the original abstract
Pixel-level annotation is costly in low-resource dermoscopy. We present RABC-Net, a reliability-aware annotation-free segmentation system that combines pseudo-label reliability learning, restricted target-domain adaptation, and Reliability-Adaptive Boundary Calibration (RABC). The system decouples reliability learning from deployment: uncertainty-aware pseudo-label interaction shapes robust representations during training, while the image-only inference path is preserved and RABC performs local logit-space calibration from boundary confidence, uncertainty, and foreground probability. No manual masks are used for training or target-domain adaptation; validation labels, when available, are used only for final operating-point selection. Across ISIC-2017, ISIC-2018, and PH2, RABC-Net achieves macro-average DICE/JAC of 86.58\%/79.47\% and consistent matched-protocol results. Controlled within-study analyses show that RABC provides localized gains over nonlearned boundary correction, while the overall result comes from the full reliability-aware system. Adaptation updates only 3.50\% of model parameters, image-only inference runs at 87.4 FPS, and the selected operating points use $\sigma=0$ on all three datasets, indicating that learned calibration avoids extra smoothing at deployment.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript presents RABC-Net, a reliability-aware annotation-free segmentation system for dermoscopy images that integrates uncertainty-aware pseudo-label learning, restricted target-domain adaptation (updating 3.5% of parameters), and Reliability-Adaptive Boundary Calibration (RABC) for local logit-space calibration. No manual masks are used for training or adaptation; validation labels serve only for final operating-point selection. The system reports macro-average Dice/Jaccard of 86.58%/79.47% across ISIC-2017, ISIC-2018, and PH2, with 87.4 FPS inference and consistent matched-protocol results, attributing gains to the full reliability-aware pipeline over nonlearned boundary correction.
Significance. If the annotation-free claim and performance numbers hold without selection bias, the work offers a practical advance for low-resource medical segmentation by minimizing annotation needs while preserving deployment efficiency and image-only inference. The decoupling of training-time reliability learning from inference and the uniform selection of σ=0 (indicating learned calibration suffices without extra smoothing) are concrete strengths that enhance applicability.
major comments (2)
- [Experimental results and operating-point selection] In the experimental protocol and results (as described in the abstract and quantitative evaluations), validation labels are used to select operating points (σ=0 uniformly across all three datasets). If this selection maximizes the reported metric on the validation split post-hoc without nested cross-validation or a pre-specified fixed rule, the headline macro DICE/JAC of 86.58%/79.47% risks optimistic bias, particularly on the smaller PH2 set. This selection step directly threatens the central 'no manual masks for training or target-domain adaptation' guarantee for the full pipeline whose performance is being claimed.
- [Results and within-study analyses] The abstract states that 'controlled within-study analyses show that RABC provides localized gains' and that the overall result comes from the full system, yet no detailed ablations, pseudo-label generation procedure, uncertainty estimation specifics, or error bars on the quantitative tables are referenced. Without these, it is difficult to isolate the contribution of reliability-aware pseudo-label interaction versus other components and to assess whether the reported gains are robust or sensitive to implementation choices.
minor comments (1)
- [Abstract] The abstract reports macro-averages but does not include per-dataset scores or standard deviations; adding these (e.g., in a results table) would strengthen claims of consistency across ISIC-2017/2018 and PH2.
Simulated Author's Rebuttal
We thank the referee for the constructive feedback on our work. Below we provide detailed responses to the major comments, clarifying our experimental protocol and committing to revisions that enhance transparency and robustness of the presented results.
read point-by-point responses
-
Referee: In the experimental protocol and results (as described in the abstract and quantitative evaluations), validation labels are used to select operating points (σ=0 uniformly across all three datasets). If this selection maximizes the reported metric on the validation split post-hoc without nested cross-validation or a pre-specified fixed rule, the headline macro DICE/JAC of 86.58%/79.47% risks optimistic bias, particularly on the smaller PH2 set. This selection step directly threatens the central 'no manual masks for training or target-domain adaptation' guarantee for the full pipeline whose performance is being claimed.
Authors: We agree that post-hoc selection of the operating point using validation labels can introduce optimistic bias in the reported metrics. The manuscript is transparent that validation labels are used only for this final selection step and not for any training or adaptation. The fact that σ=0 was selected uniformly suggests that the RABC mechanism provides effective calibration without requiring dataset-specific tuning. To strengthen the claim and address the bias concern, we will revise the paper to adopt σ=0 as a fixed operating point determined by the system design (learned calibration suffices), present the results under this fixed rule, and explicitly discuss how this maintains the annotation-free nature of the training and adaptation phases while noting the standard practice of operating point selection for deployment. revision: partial
-
Referee: The abstract states that 'controlled within-study analyses show that RABC provides localized gains' and that the overall result comes from the full system, yet no detailed ablations, pseudo-label generation procedure, uncertainty estimation specifics, or error bars on the quantitative tables are referenced. Without these, it is difficult to isolate the contribution of reliability-aware pseudo-label interaction versus other components and to assess whether the reported gains are robust or sensitive to implementation choices.
Authors: While the manuscript includes descriptions of the pseudo-label generation, uncertainty estimation, and within-study comparisons demonstrating RABC's localized gains over nonlearned methods, we recognize that these may not be sufficiently detailed or prominently referenced for full reproducibility and assessment. In the revised version, we will expand the relevant sections with more specifics on the procedures, add error bars to the tables, include additional ablation studies if necessary, and ensure clear cross-references from the abstract and results to these analyses. revision: yes
Circularity Check
No significant circularity; empirical method with explicit validation protocol
full rationale
The paper presents an empirical ML segmentation pipeline rather than a mathematical derivation chain. Core claims rest on training without manual masks (pseudo-labels and restricted adaptation) and reporting macro DICE/JAC on public benchmarks (ISIC-2017/2018, PH2). The explicit statement that validation labels are used only for final operating-point selection (with σ=0 chosen uniformly) does not reduce any prediction or result to a fitted input by construction; it is a transparent post-training step for metric reporting. No equations, uniqueness theorems, or self-citations are invoked in a load-bearing way that collapses the central result to its own inputs. The method is self-contained against external benchmarks.
Axiom & Free-Parameter Ledger
free parameters (2)
- sigma
- adaptation fraction
axioms (2)
- domain assumption Uncertainty-aware pseudo-label interaction shapes robust representations without manual supervision.
- domain assumption RABC local logit-space calibration improves boundary accuracy using confidence, uncertainty, and foreground probability.
Reference graph
Works this paper leans on
-
[1]
author Ahn, E. , author Feng, D. , author Kim, J. , year 2021 . title A Spatial Guided Self-Supervised Clustering Network for Medical Image Segmentation , in: booktitle Medical Image Computing and Computer Assisted Intervention -- MICCAI 2021 , pp. pages 379--388 . :10.1007/978-3-030-87193-2_36
-
[2]
author Azad, R. , author Asadi-Aghbolaghi, M. , author Fathy, M. , author Escalera, S. , year 2020 . title Attention Deeplabv3+: Multi-level Context Attention Mechanism for Skin Lesion Segmentation , in: booktitle Computer Vision -- ECCV 2020 Workshops , pp. pages 251--266 . :10.1007/978-3-030-65414-6_19
-
[3]
author Bateson, M. , author Kervadec, H. , author Dolz, J. , author Lombaert, H. , author Ben Ayed , I. , year 2022 . title Source-free Domain Adaptation for Image Segmentation . journal Medical Image Analysis volume 82 , pages 102617 . :10.1016/j.media.2022.102617
-
[4]
author Chen, C. , author Dou, Q. , author Chen, H. , author Qin, J. , author Heng, P.A. , year 2019 . title Synergistic Image and Feature Adaptation: Towards Cross-Modality Domain Adaptation for Medical Image Segmentation , in: booktitle Proc. AAAI , pp. pages 865--872 . :10.1609/aaai.v33i01.3301865
-
[5]
author Cheng, J. , author Ye, J. , author Deng, Z. , et al., year 2023 . title SAM-Med2D . journal arXiv preprint arXiv:2308.16184 :10.48550/arXiv.2308.16184
-
[6]
author Codella, N.C.F. , author Gutman, D. , author Celebi, M.E. , et al., year 2018 . title Skin Lesion Analysis Toward Melanoma Detection: A Challenge at the 2017 International Symposium on Biomedical Imaging (ISBI), Hosted by the International Skin Imaging Collaboration (ISIC) , in: booktitle Proc. IEEE ISBI , pp. pages 168--172 . :10.1109/ISBI.2018.8363547
-
[7]
author Codella, N.C.F. , author Rotemberg, V. , author Tschandl, P. , et al., year 2019 . title Skin Lesion Analysis Toward Melanoma Detection 2018: A Challenge Hosted by the International Skin Imaging Collaboration (ISIC) . journal arXiv preprint arXiv:1902.03368 :10.48550/arXiv.1902.03368
-
[8]
author He, K. , author Sun, J. , author Tang, X. , year 2013 . title Guided Image Filtering . journal IEEE Transactions on Pattern Analysis and Machine Intelligence volume 35 , pages 1397--1409 . :10.1109/TPAMI.2012.213
-
[9]
author Karani, N. , author Erdil, E. , author Chaitanya, K. , author Konukoglu, E. , year 2021 . title Test-time Adaptable Neural Networks for Robust Medical Image Segmentation . journal Medical Image Analysis volume 68 , pages 101907 . :10.1016/j.media.2020.101907
-
[10]
, author Mintun, E
author Kirillov, A. , author Mintun, E. , author Ravi, N. , et al., year 2023 . title Segment Anything , in: booktitle Proc. IEEE/CVF ICCV , pp. pages 4015--4026
2023
-
[11]
a henb \
author Kr \"a henb \"u hl, P. , author Koltun, V. , year 2011 . title Efficient Inference in Fully Connected CRFs with Gaussian Edge Potentials , in: booktitle Advances in Neural Information Processing Systems , pp. pages 109--117
2011
-
[12]
author Li, X. , author Peng, B. , author Hu, J. , author Ma, C. , author Yang, D. , author Xie, Z. , year 2024 . title USL-Net: Uncertainty Self-Learning Network for Unsupervised Skin Lesion Segmentation . journal Biomedical Signal Processing and Control volume 89 , pages 105769 . :10.1016/j.bspc.2023.105769
-
[13]
author Li, X. , author Peng, B. , author Zhang, J. , author Zhang, Z. , author Xie, Z. , year 2026 . title Reliable Multi-Source Contrastive Pseudo-Labels Interaction Network for unsupervised skin lesion segmentation . journal Biomedical Signal Processing and Control volume 112 , pages 108433 . :10.1016/j.bspc.2025.108433
-
[14]
author Liu, Q. , author Dou, Q. , author Heng, P.A. , year 2020 . title Shape-Aware Meta-learning for Generalizing Prostate MRI Segmentation to Unseen Domains , in: booktitle Proc. MICCAI , pp. pages 475--485 . :10.1007/978-3-030-59713-9_46
-
[15]
MViTv2: Improved Multiscale Vision Transformers for Classification and Detection , isbn =
author Liu, Z. , author Mao, H. , author Wu, C.Y. , et al., year 2022 . title A ConvNet for the 2020s , in: booktitle Proc. IEEE/CVF CVPR , pp. pages 11966--11976 . :10.1109/CVPR52688.2022.01167
-
[16]
author Ma, J. , author He, Y. , author Li, F. , et al., year 2024 . title Segment Anything in Medical Images . journal Nature Communications volume 15 , pages 654 . :10.1038/s41467-024-44824-z
-
[17]
, year 1967
author MacQueen, J. , year 1967 . title Some Methods for Classification and Analysis of Multivariate Observations , in: booktitle Proc. 5th Berkeley Symposium on Mathematical Statistics and Probability , pp. pages 281--297
1967
-
[18]
author Mendon c a, T. , author Ferreira, P.M. , author Marques, J.S. , author Marcal, A.R.S. , author Rozeira, J. , year 2013 . title PH2 --- A Dermoscopic Image Database for Research and Benchmarking , in: booktitle Proc. IEEE EMBC , pp. pages 5437--5440 . :10.1109/EMBC.2013.6610779
-
[19]
author Pati \ n o, D. , author Avenda \ n o, J. , author Branch, J.W. , year 2018 . title Automatic Skin Lesion Segmentation on Dermoscopic Images by the Means of Superpixel Merging . journal arXiv preprint arXiv:1808.06759 :10.48550/arXiv.1808.06759
-
[20]
In: Medical Image Compu ting and Computer-Assisted Intervention – MICCAI 2015
author Ronneberger, O. , author Fischer, P. , author Brox, T. , year 2015 . title U-Net: Convolutional Networks for Biomedical Image Segmentation , in: booktitle Medical Image Computing and Computer-Assisted Intervention -- MICCAI 2015 , pp. pages 234--241 . :10.1007/978-3-319-24574-4_28
-
[21]
author Ruan, J. , author Xiang, S. , author Xie, M. , author Liu, T. , author Fu, Y. , year 2022 . title MALUNet: A Multi-Attention and Light-Weight UNet for Skin Lesion Segmentation , in: booktitle 2022 IEEE International Conference on Bioinformatics and Biomedicine (BIBM) , pp. pages 1150--1156 . :10.1109/BIBM55620.2022.9995040. note see also arXiv:2211.01784
-
[22]
, author Malik, J
author Shi, J. , author Malik, J. , year 2000 . title Normalized Cuts and Image Segmentation . journal IEEE Transactions on Pattern Analysis and Machine Intelligence volume 22 , pages 888--905
2000
-
[23]
author Wu, H. , author Chen, S. , author Chen, G. , et al., year 2022 . title FAT-Net: Feature Adaptive Transformers for Automated Skin Lesion Segmentation . journal Medical Image Analysis volume 76 , pages 102327 . :10.1016/j.media.2021.102327
-
[24]
author Zeng, G. , author Peng, H. , author Li, A. , author Liu, Z. , author Liu, C. , author Yu, P.S. , author He, L. , year 2023 . title Unsupervised Skin Lesion Segmentation via Structural Entropy Minimization on Multi-Scale Superpixel Graphs , in: booktitle 2023 IEEE International Conference on Data Mining (ICDM) , pp. pages 768--777 . :10.1109/ICDM585...
-
[25]
arXiv preprint arXiv:2304.13785 (2023)
author Zhang, K. , author Liu, D. , year 2023 . title Customized Segment Anything Model for Medical Image Segmentation . journal arXiv preprint arXiv:2304.13785 :10.48550/arXiv.2304.13785
-
[26]
author Zhang, Y. , author Liu, H. , author Hu, Q. , year 2021 . title TransFuse: Fusing Transformers and CNNs for Medical Image Segmentation , in: booktitle Medical Image Computing and Computer-Assisted Intervention -- MICCAI 2021 , pp. pages 14--24 . :10.1007/978-3-030-87193-2_2
-
[27]
author Zhou, H. , author Qiao, B. , author Yang, L. , author Lai, J. , author Xie, X. , year 2023 a. title Texture-Guided Saliency Distilling for Unsupervised Salient Object Detection , in: booktitle Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR) , pp. pages 7257--7267 . :10.1109/CVPR52729.2023.00701
-
[28]
author Zhou, X. , author Tong, T. , author Zhong, Z. , author Fan, H. , author Li, Z. , year 2023 b. title Saliency-CCE: Exploiting Colour Contextual Extractor and Saliency-Based Biomedical Image Segmentation . journal Computers in Biology and Medicine volume 154 , pages 106551 . :10.1016/j.compbiomed.2023.106551
-
[29]
author Zhou, Z. , author Siddiquee, M.M.R. , author Tajbakhsh, N. , author Liang, J. , year 2018 . title UNet++: A Nested U-Net Architecture for Medical Image Segmentation , in: booktitle Deep Learning in Medical Image Analysis and Multimodal Learning for Clinical Decision Support , pp. pages 3--11 . :10.1007/978-3-030-00889-5_1
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.