Cited by 19Advanced Neural Network ApplicationsMedical Image Segmentation TechniquesAdversarial Robustness in Machine Learning

Conformal Semantic Image Segmentation: Post-hoc Quantification of Predictive Uncertainty

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Mossina, Luca, Dalmau, Joseba, Andéol, Léo·2024·2024 IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)

Abstract

We propose a post-hoc, computationally lightweight method to quantify predictive uncertainty in semantic image segmentation. Our approach uses conformal prediction to generate statistically valid prediction sets that are guaranteed to include the ground-truth segmentation mask at a predefined confidence level. We introduce a novel visualization technique of conformalized predictions based on heatmaps, and provide metrics to assess their empirical validity. We demonstrate the effectiveness of our approach on well-known benchmark datasets and image segmentation prediction models, and conclude with practical insights.

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  • Other conformal approaches reduce false negatives by lowering score thresholds or by morphological dilation of the predicted mask.

    “Other conformal approaches reduce false negatives by lowering score thresholds [2, 13, 5] or by morphological dilation of the predicted mask [14].”

    From Controlling False Positives in Image Segmentation via Conformal Prediction (2025) · cites this paper as [13]

    The [14] citation is attached to morphological dilation, not to lowering score thresholds. Section 4.1.1 describes constructing multi-labeled masks by thresholding pixel-wise softmax scores, but the passages found do not address morphological dilation of a predicted mask. The cited copy therefore does not verify the claim attached to [14]. (LLM, conf=0.72)

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Research works printed but not linked: 6

  1. Anastasios N Angelopoulos, Stephen Bates, Emmanuel J Candès, Michael I Jordan, and Lihua Lei. Learn then test: Calibrating predictive algorithms to achieve risk control. arXiv preprint arXiv:2110.01052, 2021. · arXiv
  2. Omer Belhasin, Yaniv Romano, Daniel Freedman, Ehud Rivlin, and Michael Elad. Volume-oriented uncertainty for inverse problems. In NeurIPS 2023 Workshop on Deep Learning and Inverse Problems, 2023. 3
  3. Chirag Gupta, Aleksandr Podkopaev, and Aaditya Ramdas. Distribution-free binary classification: prediction sets, confi- dence intervals and calibration. In Advances in Neural Infor- mation Processing Systems, pages 3711-3723.
  4. Alex Kendall and Yarin Gal. What uncertainties do we need in bayesian deep learning for computer vision? Advances in neural information processing systems, 30, 2017. 3
  5. Vladimir Vovk, Alexander Gammerman, and Glenn Shafer. Algorithmic learning in a random world. Springer, 2005. 1, 2, 3
  6. Dongdong Wang, Boqing Gong, and Liqiang Wang. On cal- ibrating semantic segmentation models: Analyses and an al- gorithm. In Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition, pages 23652- 23662, 2023. 3

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Authors
Mossina, L., Dalmau, J., & Andéol, L.
Affiliations
  • IRT Saint Exupéry (FR)
  • Université Toulouse III - Paul Sabatier (FR)
Venue
2024 IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)
Publisher
IEEE
Published
2024-06-17
Pages
3574-3584
OpenAlex
W4396817150
Cited by
18
References
56
Citations by year
2026: 7 · 2025: 11
FWCI
3.72
Type
conference paper
Language
en
Open access
Locations
  • IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW) (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • HAL (submittedVersion, other-oa)
  • arXiv (Cornell University)
Funders
Agence Nationale de la Recherche
Topics
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Advanced Neural Network Applications
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Medical Image Segmentation Techniques
  • Physical Sciences › Computer Science › Artificial Intelligence › Adversarial Robustness in Machine Learning
Keywords
conformal prediction, semantic segmentation, forecast uncertainty, prediction sets, heatmaps, confidence intervals

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