REVIEW 2 major objections 2 minor 44 references
AmbientEye: A Dataset for Pupil Segmentation under Natural Ambient Infrared Illumination
T0 review · 2 major / 2 minor · reviewed 2026-06-28 · grok-4.3
Pith's one-line read Pupil segmentation accuracy drops from 0.928 to 0.767 when moving from controlled active IR to natural ambient sunlight alone.
desk verdict AmbientEye is a solid dataset release for ambient IR pupil segmentation with real practical value, but the annotation quality lacks the checks needed to fully trust the reported performance drop. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The AmbientEye dataset of 2,606,225 eye images captured outdoors under passive natural sunlight with off-axis IR cameras and SAM2-plus-human annotations.
What would settle it
Re-annotating a random subset of AmbientEye images with an entirely independent annotation protocol and then re-running the same segmentation algorithm to check whether the 0.767 score changes by more than a few points.
Extended reading notes
Core claim
AmbientEye supplies the first large-scale benchmark for pupil segmentation under natural ambient infrared illumination from sunlight alone. Images were gathered outdoors from a diverse participant pool using two camera configurations and two sun positions. Annotations combine SAM2 output with human refinement. When a state-of-the-art pupil segmentation algorithm is evaluated on AmbientEye, its score falls from 0.928 on prior controlled-IR collections to 0.767, establishing the dataset as a reference point for this unconstrained outdoor scenario.
Load-bearing premise
The combination of SAM2 automatic segmentation followed by human annotator refinement produces annotations of sufficient quality and consistency to serve as a reliable benchmark standard for the new ambient illumination domain.
Editorial extensions
If this is right
- Existing pupil segmentation methods developed for controlled active-IR settings do not transfer directly to outdoor ambient conditions.
- Reliable pupil detection for all-day outdoor use will require algorithms explicitly designed for variable natural sunlight.
- AmbientEye provides the first public reference for measuring progress on passive-IR eye tracking.
- Power savings from removing active IR illuminators remain out of reach until segmentation robustness improves.
Reading between the lines
- Smart-glasses battery life could increase if methods close the performance gap, because active IR sources consume significant power.
- Outdoor augmented-reality applications that rely on gaze may need hybrid active-plus-passive systems until ambient-only solutions mature.
- The dataset's scale and participant diversity suggest it can also support training new models that generalize across skin tones and lighting angles.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript introduces AmbientEye, a dataset of 2,606,225 eye images captured outdoors from 35 participants across 19 countries under natural sunlight (two off-axis camera setups and two sun-orientation conditions). Pupil annotations are produced via SAM2 automatic segmentation followed by human refinement. A state-of-the-art pupil segmentation algorithm is benchmarked, yielding 0.767 performance on AmbientEye versus 0.928 on prior controlled-IR datasets; the gap is presented as evidence that ambient illumination constitutes a distinct practical challenge for eye tracking.
Significance. If the ground-truth annotations are shown to be reliable and consistent, the work supplies the first large-scale benchmark for passive-IR pupil segmentation in unconstrained outdoor settings. This directly addresses power-consumption barriers for all-day smart-glasses eye tracking and supplies a falsifiable testbed for future algorithms under variable sunlight and reflections.
major comments (2)
- [§3 (Dataset Creation / Annotation)] §3 (Dataset Creation / Annotation): The central empirical claim rests on the 0.767 figure being a valid measure of algorithmic difficulty rather than annotation noise. The description states only that annotations result from 'SAM2 automatic segmentation, followed by refinement by human annotators' with no inter-annotator agreement statistics, expert validation against ophthalmologists, or quantitative analysis of residual SAM2 errors under off-axis sunlight and corneal reflections. This omission directly affects whether the reported performance gap can be interpreted as domain difficulty.
- [§4 (Benchmarking and Results)] §4 (Benchmarking and Results): The comparison to the 0.928 controlled-IR baseline is load-bearing for the 'distinct challenge' conclusion, yet no statistical test of the gap, participant-level variance, or exclusion-criteria justification is supplied. Without these, the headline drop cannot be assessed for robustness.
minor comments (2)
- [Abstract] Abstract: The phrase 'high-quality pupil annotation' is used without supporting metrics; this should be qualified or moved to the methods section.
- [Tables/Figures] Table/Figure captions: Ensure all reported metrics (e.g., IoU or Dice) are explicitly defined and that the exact evaluation protocol on prior datasets is stated for reproducibility.
Simulated Author's Rebuttal
We thank the referee for their constructive comments. We address each major comment below and indicate the revisions that will be incorporated into the next manuscript version.
read point-by-point responses
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Referee: [§3 (Dataset Creation / Annotation)] §3 (Dataset Creation / Annotation): The central empirical claim rests on the 0.767 figure being a valid measure of algorithmic difficulty rather than annotation noise. The description states only that annotations result from 'SAM2 automatic segmentation, followed by refinement by human annotators' with no inter-annotator agreement statistics, expert validation against ophthalmologists, or quantitative analysis of residual SAM2 errors under off-axis sunlight and corneal reflections. This omission directly affects whether the reported performance gap can be interpreted as domain difficulty.
Authors: We agree that quantitative validation of the annotations is important for interpreting the performance numbers. In the revised manuscript we will add (i) inter-annotator agreement (mean Dice score) computed on a random subset of 10 000 images that were independently refined by two human annotators and (ii) a breakdown of the fraction of images in which the SAM2 initialization was substantially edited by humans, stratified by sun-orientation condition. We will not add ophthalmologist validation because the annotations concern geometric pupil boundaries in infrared imagery rather than clinical diagnosis; we will explicitly state this scope limitation. These additions directly address the concern about annotation noise versus domain difficulty. revision: partial
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Referee: [§4 (Benchmarking and Results)] §4 (Benchmarking and Results): The comparison to the 0.928 controlled-IR baseline is load-bearing for the 'distinct challenge' conclusion, yet no statistical test of the gap, participant-level variance, or exclusion-criteria justification is supplied. Without these, the headline drop cannot be assessed for robustness.
Authors: We concur that additional statistical reporting is needed. The revised manuscript will include (i) a Wilcoxon signed-rank test comparing per-image IoU on AmbientEye versus the controlled-IR datasets, (ii) participant-level mean IoU and standard deviation across the 35 subjects to quantify variance, and (iii) an explicit description of the exclusion criteria (images removed for severe motion blur, extreme head pose, or hardware failure) together with the number of frames excluded per condition. These changes will allow readers to evaluate the robustness of the reported performance gap. revision: yes
Circularity Check
No circularity: empirical dataset release with external benchmarks
full rationale
The paper introduces AmbientEye as a new dataset and reports benchmark results on pupil segmentation. No derivations, equations, fitted parameters, or predictions are present in the provided text. The performance comparison (0.928 on controlled IR vs. 0.767 on AmbientEye) is a direct empirical measurement against external datasets, with no self-referential reduction or load-bearing self-citation. Annotation process is described but does not involve any claimed derivation chain. This is a standard dataset paper with no internal circularity.
Assumptions & free parameters
Cite this review
Pith. "Pith review of AmbientEye: A Dataset for Pupil Segmentation under Natural Ambient Infrared Illumination." pith.science (2026). https://pith.science/paper/3BTBGMSK
@misc{pith2026260603774,
author = {Pith},
title = {Pith review of: AmbientEye: A Dataset for Pupil Segmentation under Natural Ambient Infrared Illumination},
year = {2026},
howpublished = {\url{https://pith.science/paper/3BTBGMSK}},
note = {Machine review of arXiv:2606.03774}
}
read the original abstract
Eye tracking is essential for smart glasses, as it provides insight into user attention for ambient intelligence applications. However, most existing eye-tracking systems rely on active infrared (IR) illumination, creating practical barriers to all-day outdoor use due to power consumption. In this paper, we investigate whether passive IR cameras alone, without any active IR light source, can enable reliable pupil detection in unconstrained outdoor environments, where ambient sunlight serves as the sole illumination source. To support this investigation, we introduce AmbientEye, a large-scale dataset of 2,606,225 eye images collected from 35 participants from 19 countries. It is captured outdoors under natural sunlight with two off-axis camera configurations and two sun-orientation conditions. We provide high-quality pupil annotation through SAM2 automatic segmentation, followed by refinement by human annotators. We benchmark a state-of-the-art pupil segmentation algorithm on our dataset and compare its performance with that on existing datasets under controlled IR illumination. Results reveal a substantial drop in pupil segmentation performance from 0.928 on controlled IR datasets to 0.767 on AmbientEye. This performance gap highlights the challenge of the ambient-light setting. This positions AmbientEye as a first benchmark for an unexplored and highly practical eye-tracking scenario.
Figures
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Reference graph
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