tone_map — DRIVE env op

• Data kinds: any × scalar → any

• Call: import fullseye as fs; fs.ledger.tone_map(radiance, exposure: 'float') (to call the implementation directly, import driveenv; driveenv.tone_map(radiance, exposure: 'float'); from the registry, opsdrive.get("tone_map"))

Usage

Hue-preserving tone compression for an HDR camera: m = per-pixel max channel × exposure, display = luminance × exposure × (1 + m/4)/(1 + m) — linear for m ≪ 1, approaching 1 in bright areas (color ratios = chromaticity unchanged; lamps do not turn white from saturation; assumed: an in-vehicle HDR camera).

References (sample data, literature)

• 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.

Runnable examples (verified samples that actually call this op)

• (none yet)

Ops the type connects to (they accept any as input)

course_crank · course_s_curve · course_turnaround · course_slope · course_intersection · course_parallel_parking · course_crossing · course_road

Same category (env)

julian_day · sun_at · sun_events · sun_vector · sun_illuminance · koschmieder · mor_from_beta · beta_from_mor

*Provenance: driveenv.py — DRIVE 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.