scale op• Data kinds: measurement → measurement
• Call: import fullseye as fs; fs.ledger.pixel_to_world(value_px, mm_per_px) (to call the implementation directly, import measuring1d; measuring1d.pixel_to_world(value_px, mm_per_px); from the registry, opsmeasure1d.get("pixel_to_world"))
Converts one length measured in pixels to real-world mm (value_px * mm_per_px).
Pass a mm_per_px that was measured with mm_per_px_from_reference. value_px may be zero or negative (differences and biases convert as they are) but must be finite; mm_per_px must be finite and positive. Otherwise ValueError. Returns a float (measurement sort). For areas, square mm/px and multiply yourself (this op handles lengths only).
• subpixel_measuring family guide
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
• example_inner_diameter_mm — py -3.11 examples/example_inner_diameter_mm.py
measurement as input)scale)mm_per_px_from_reference · table_px_to_mm
*Provenance: measuring1d.py — MEASURE1D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.