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Credits

Caliper composes well-grounded prior art rather than inventing new algorithms. This file is the human-readable counterpart to the SPDX headers and the license metadata that Cargo surfaces mechanically: it credits the authors and prior work whose ideas, implementations, or specifications materially shaped Caliper.

See CONTRIBUTING.md for license terms of contributions to Caliper itself.

Algorithms

Work Author(s) License Source Scope
Potrace: a polygon-based tracing algorithm (2003) Peter Selinger Paper / GPL-2.0+ https://potrace.sourceforge.net/ Reference quality benchmark for bi-level tracing; Selinger segment-merging used in caliper-temper.
Topological Structural Analysis of Digitized Binary Images by Border Following (1985) Satoshi Suzuki & Keiichi Abe Paper CVGIP 30(1) Boundary-following algorithm implemented in caliper-burin.
Line generalisation by repeated elimination of points (1993) M. Visvalingam & J. D. Whyatt Paper Cartographic Journal 30(1) Path simplification in caliper-burin.
VTracer visioncortex MIT https://github.com/visioncortex/vtracer O(n) Bézier-fitting lineage; hierarchical clustering ideas in caliper-temper.
The OKLab colour space (2020) Björn Ottosson Article / public-domain math https://bottosson.github.io/posts/oklab Perceptually-uniform colour space used by caliper-smelt for k-means quantisation.
Holistically-Nested Edge Detection (HED, 2015) Saining Xie & Zhuowen Tu Paper https://arxiv.org/abs/1504.06375 ML edge-detection model integrated via caliper-touchstone.
Bi-Directional Cascade Network for Perceptual Edge Detection (BDCN, 2019) He et al. Paper https://arxiv.org/abs/1902.10903 Alternative ML edge-detection model in caliper-touchstone.
RANSAC primitive fitting Fischler & Bolles (1981) Paper / public-domain idiom CACM 24(6) Circle / ellipse / rectangle / star fitting in caliper-temper.

Tooling & Specifications

Work Author(s) License Source Scope
Microsoft Pragmatic Rust Guidelines Microsoft Corporation MIT https://github.com/microsoft/rust-guidelines Style, naming, safety, and API-design rules followed across the workspace.
Steelbore Rust Guidelines Mohamed Hammad GPL-3.0-or-later https://github.com/Steelbore/rust-guidelines Steelbore adaptation of the Microsoft guidelines.
Model Context Protocol (MCP) Anthropic & contributors MIT https://modelcontextprotocol.io Protocol implemented by caliper mcp.
ONNX Runtime Microsoft & contributors MIT https://onnxruntime.ai Underlies caliper-touchstone via the ort Rust bindings.
wgpu gfx-rs project MIT / Apache-2.0 https://wgpu.rs Portable compute-shader backend powering caliper-bellows.
Ratatui Ratatui contributors MIT https://ratatui.rs TUI framework powering caliper-tui.
Rayon Niko Matsakis & contributors MIT / Apache-2.0 https://docs.rs/rayon Work-stealing parallelism throughout the pipeline.

Standards

Caliper conforms to (but does not redistribute) the following standards. They are listed here for transparency; license metadata is not separately tracked.

  • POSIX.1-2024 (IEEE Std 1003.1-2024) — CLI behaviour
  • ISO 8601:2019 — date / time / duration format
  • WCAG 2.1 Level AA — colour contrast for the TUI
  • SVG 1.1 (W3C Recommendation) — primary output format
  • PDF 1.7 (ISO 32000-1) — PDF output
  • DXF R14 (Autodesk) — DXF output
  • RFC 7946 (GeoJSON) — GeoJSON output (v1.2.0+)
  • JSON Schema 2020-12 — caliper schema output

Acknowledgements

The Caliper architecture would not exist without the open-source ecosystem that made every dependency in PRD.md §16 possible. Particular thanks to the maintainers of image, rayon, crossbeam, wgpu, ort, clap, ratatui, crossterm, pdf-writer, quick-xml, serde, jiff, tracing, rmcp, and blake3 — every one is load-bearing.

Maintainer

Mohamed Hammad <Mohamed.Hammad@Steelbore.com> https://Caliper.Steelbore.com/