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LinePilot Digitizer v2.16

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@RayanA07 RayanA07 released this 20 Oct 02:23
v2.16
2624ce4

LinePilot Digitizer 2.16 (Windows)

Turn a picture of a line plot into numbers — a CSV plus an overlay image showing the detected points. No install, no Python: the Tesseract OCR engine is bundled inside the app.

Three calibration modes, one curve-recovery workflow:

  • Standard — click four axis ticks.
  • Enhanced — the same four clicks, snapped to tick centers at sub-pixel precision (Tools → Calibration → Enhanced Human Click).
  • OCR — fully automatic axis reading (Advanced → Axis Scale Detection), also used by the command line and batch mode.

New in this release

Changed

Added

  • About ▾ menu in the top-right corner of the window: About LinePilot, Cite this
    software     (one-click Copy BibTeX / plain citation), Acknowledgments (NSF POSE award
    No. 2518273, SpectraGuru team), Third-party licenses, and links to the website, paper,
    source code and issue tracker.
  • GitHub Actions workflow that builds Digitizer.exe and AccuracyTester.exe on Windows
    (Tesseract bundled) and attaches them to the release for every v* tag.
  • CITATION.cff, a screenshot walkthrough in the README, and the project website in docs/.

Digitization is unchanged from 2.15.

Install (Windows 10 / 11)

  1. Under Assets below, download Digitizer.exe.
  2. Double-click it. On the very first run Windows SmartScreen may show "Windows protected your PC" — click More info, then Run anyway. This is expected; the app simply isn't code-signed.
  3. That's it. Optional: AccuracyTester.exe compares a digitized CSV against a reference CSV.

If double-clicking does nothing at all (no window, no warning), Smart App Control is silently blocking unsigned programs. Run from source instead — see the README. Turning Smart App Control off is a one-way door, so prefer running from source.

Full guide: README · Project site: https://rayana07.github.io/LinePilot/

Known limitations

  • OCR can drop minus signs on negative tick labels and misread superscript / power-of-ten axes. Pass --axis or type the values in by hand in the app.
  • Curves drawn in black or grey on charts with black axes are not reliably separable by the color-based extractor.
  • Low-resolution figures are the main cause of wrong numbers; the app warns below 700 px.

If you find LinePilot useful, please cite our paper

Fengbo Ma, Rayan Akhtar, Aakash H. Joshi, Xiaoting Li, Haijian Sun, Zhen Xiang, Xianyan Chen, Yiping Zhao.
LinePilot Digitizer: Line-Plot Recovery with Manual and Automatic Calibration. arXiv:2609.19377, 2026.
https://arxiv.org/abs/2609.19377

@article{ma2026linepilot,
  title   = {LinePilot Digitizer: Line-Plot Recovery with Manual and Automatic Calibration},
  author  = {Ma, Fengbo and Akhtar, Rayan and Joshi, Aakash H. and Li, Xiaoting and
             Sun, Haijian and Xiang, Zhen and Chen, Xianyan and Zhao, Yiping},
  journal = {arXiv preprint arXiv:2609.19377},
  year    = {2026},
  doi     = {10.48550/arXiv.2609.19377}
}

⭐ Star or fork the repo, and let us know how we did — bug reports, feature requests and example figures that trip it up are all welcome.

Acknowledgment

This work was supported by the National Science Foundation through the Pathways to Open-Source Ecosystems (POSE) program, award No. 2518273. The authors gratefully acknowledge the support, guidance and collaboration of all members of the SpectraGuru™ development and stakeholder teams.

Full changelog: https://github.com/RayanA07/LinePilot/blob/main/CHANGELOG.md

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