Measuring Browser Webcam Gaze Honestly: A Capture-Clock Methodology and Open Reference Implementation — Paper

Abstract

-cross Abstract: Browser-based webcam gaze trackers are increasingly used for crowd-scale data collection and in clinical settings where lab eye trackers are impractical, but the reported latency numbers may not represent real world functionality. The common practice of timestamping each gaze sample when it is emitted, rather than when its source frame was captured, makes the measured inference latency read about $0\,$ms no matter how slow the engine really is. We show how to measure it honestly, recovering a per-frame capture clock from the browser's \texttt{re\-quest\-Video\-Frame\-Call\-back} (rVFC) API (\texttt{captureTime} where the browser exposes it for local camera streams, else \texttt{presentationTime}, in which case every recovered latency is a verifiable lower bound): exact source-frame pairing through a per-frame queue for engines that expose their inference pipeline, and a further lower bound for engines that do not, such as WebGazer. We release an open TypeScript implementation and benchmark harness, demonstrated on two interchangeable engines: WebGazer and a new FaceMesh+KRR pipeline.

Authors 2

Chi-Sheng Chen, Gabriel A. Brat

Specification

Official page: arxiv.org/abs/2608.11566
Source:arXiv (Atom API + RSS)T1observed 2 h agohigh
Arxiv announce type: replace
Source:arXiv (Atom API + RSS)T1observed 2 h agohigh
arXiv id: 2608.11566
Source:arXiv (Atom API + RSS)T1observed 2 h agohigh
Categories: cs.HC, cs.CV, eess.SP
Source:arXiv (Atom API + RSS)T1observed 2 h agohigh
PDF: arxiv.org/pdf/2608.11566
Source:arXiv (Atom API + RSS)T1observed 2 h agohigh
Primary category: cs.HC
Source:arXiv (Atom API + RSS)T1observed 2 h agohigh
Published: 11 Sept 2026
Source:arXiv (Atom API + RSS)T1observed 2 h agohigh

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9

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T19

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2 h ago

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Authors: Chi-Sheng Chen, Gabriel A. Brat

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Value	Valid from → to	Status	Source	Confidence	Extractor
cs.HC, cs.CV, eess.SP	11 Sept 2026 21:03 UTC → current	current	arXiv (Atom API + RSS)T1	high	deterministic

Claims are temporal and append-only: a new observation closes the previous claim (valid_to) instead of overwriting it. Conflicting claims from different sources are kept side by side and flagged — never averaged. Methodology →

11 Sept 2026
New paperPaperMeasuring Browser Webcam Gaze Honestly: A Capture-Clock Methodology and Open Reference Implementation
New paper: Measuring Browser Webcam Gaze Honestly: A Capture-Clock Methodology and Open Reference Implementation
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Source documents
Source	Document	Type	Tier	Last observed	Snapshots
arXiv (Atom API + RSS)	rss.arxiv.org/rss/cs.CV	feed	T1· Official	2 h ago	1

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