Writing study: NOWA: Null-space Optical Watermark for Invisible Capture Fingerprinting and Tamper Localization

CVPR overviewCorpus atlasBy contribution typeVisual galleryRules & templateWriting patternsPaper studies

← CVPR 2026 oral writing corpus

Edwin Vargas, Jhon Lopez, Henry Arguello, Ashok Veeraraghavan · Official CVPR 2026 oral record

Observed writing choices, not acceptance rules. This study examines the inspected manuscript version. It does not establish why the paper was accepted or that its presentation choices should be copied unchanged.

Figure, table and section ledger

Editorial contribution type: Domain-grounded methods & physical systems (primary).

Layout extraction, not a required paper template. Counts are distinct caption labels; a multi-panel figure counts once. Section spans are estimated from heading positions, including floats and whitespace. Method and limitations.

Canonical PDF

11 physical pages

Before references / appendix

≈ 8.1 page-equivalents

Main figures / tables

5 / 2

Attached appendix figures / tables

0 / 0

Attached appendix span

Separate file recorded below; not in this PDF total

Before references / appendix: ≈ 73.64%References / intervening material: ≈ 26.36%Estimated layout envelopes, not text/artwork area. Unresolved appendix boundaries remain within the undivided post-body material.

Extraction notes: No attached appendix boundary detected. Zero means no recognized caption, not independently verified absence.

Section-by-section lengths and source pages

The title/abstract/front matter precede the first numbered heading. A span ends at the next detected top-level heading, not at the last sentence; end-page whitespace is included. References and statements are listed separately. These are not measurements of text-only or artwork area.

Top-level heading	Starts on PDF page	Estimated span	Share of entire PDF
1. Introduction	1	≈ 1.5 pp.	13.64%
2. Related Work	2	≈ 0.68 pp.	6.18%
3. Method	3	≈ 2.05 pp.	18.64%
4. Results	5	≈ 2.68 pp.	24.36%
5. Real Captures Experiments	8	≈ 0.49 pp.	4.45%
6. Discussion	8	≈ 0.27 pp.	2.45%
Acknowledgments	9	≈ 0.05 pp.	0.45%
References	9	≈ 2.9 pp.	26.36%

All detected figure and table locations

Main text

• Figure 1 · p. 2
• Table 1 · p. 6
• Figure 2 · p. 6
• Figure 3 · p. 6
• Figure 4 · p. 7
• Table 2 · p. 7
• Figure 5 · p. 8

Attached appendix

No recognized caption labels.

Separate source files—excluded from canonical-PDF totals

A separate author version may repeat main text and references. Whole-file lengths and counts are not extra appendix material and are never added to the canonical PDF totals. Read the study's source scope for which sections received substantive reading versus layout inspection.

Additional source 1

Separate PDF (or ZIP containing it): whole-file layout of 4 physical pages; 3 detected figures and 0 tables. These may include overlapping main-text material.

Located appendix only: starts on physical p.1; ≈ 3.85 page-equivalents, 3 figure labels and 0 table labels. This interval is distinct from the whole file.

Detected heading	PDF page	Estimated span
Supplementary Material	1	≈ 0.04 pp.
7. Hardware Prototype and Fabrication	1	≈ 0.45 pp.
8. PSF Measurement	1	≈ 0.2 pp.
9. Fine-Tuning and Implementation Details	1	≈ 0.25 pp.
10. Real-World Capture Procedure and Addi-	2	≈ 2.91 pp.

• Figure 6 · p. 1
• Figure 7 · p. 1
• Figure 8 · p. 3

Argument and organization

1. Problem and contribution

   Places the intervention at image formation and explains the difference between measurement consistency and editable digital appearance.

2. Argument sequence

   Defines the imaging/null-space formulation before optimization, controlled results, adversarial tests and a separate real-capture section.

3. Evidence and verification

   The main table repeats F1, AUC and IoU across editing methods, while a detector-input ablation separately tests the proposed null-space explanation.

Problem, claim and contribution

Places the intervention at image formation and explains the difference between measurement consistency and editable digital appearance.

Introduction and Figure 1, pp. 1–2 · Main paper · Additional source 2

Argument and section order

Defines the imaging/null-space formulation before optimization, controlled results, adversarial tests and a separate real-capture section.

Sections 3–5, pp. 3–8 · Main paper · Additional source 2

Figures, captions and visual explanation

Figure 2 puts original, edited, detector masks and ground truth in aligned columns; Figure 5 pairs real captures with edited images and translucent localization overlays.

Figures 2 and 5, pp. 6 and 8 · Main paper · Additional source 2

Tables, comparisons and evidence

The main table repeats F1, AUC and IoU across editing methods, while a detector-input ablation separately tests the proposed null-space explanation.

Table 1 and Figure 3, p. 6 · Main paper · Additional source 2

Appendix and reproducibility

Fabrication, measured PSFs and the real-capture procedure provide the physical reproducibility evidence that the main architecture cannot supply.

Supplement Sections 7–10, pp. 1–4 · Main paper · Additional source 2

Clarity and writing conventions

The discussion states aperture, alignment, calibration and adversary-access limitations after the real-hardware evidence.

Section 6, p. 8 · Main paper · Additional source 2

What to reuse—and what not to infer

Transferable lesson: For optical-learning systems, distinguish simulated comparisons from physical validation and document calibration explicitly.

Boundary: Authenticity/fingerprinting here is the scientific topic, not a repository protection mechanism; measured robustness does not remove the paper's stated attack assumptions.

Apply this lesson using the argument and evidence worksheet.

Inspection record and sources

Checked

2026-09-26

Reading status

Writing-focused manuscript scan + selected visuals inspected

Main text

Writing-oriented scan throughout Sections 1–6, PDF pp. 1–8; references pp. 9–11: abstract/framing, section sequence, figure/table captions, evaluation organization and conclusions; not an exhaustive technical verification.

Appendix / supplement

Writing-oriented supplement scan: Supplement Sections 7–10, pp. 1–4: phase-mask fabrication, assembly, PSF measurement, fine-tuning and real-capture sequence. Video/code assets were not executed or assessed.

Visually inspected PDF pages

6, 8

This is a writing-focused scan of the manuscript and the stated supplementary scope: framing, organization, visual explanation, evidence presentation and wording. It is not a line-by-line proof audit, reproduction of results or exhaustive scientific review.

• Official CVF open-access CVPR 2026 accepted-paper PDF · 11 pages
• Official CVF supplementary PDF · 4 pages