particle_image_synth — DRIVE grind op

• Data kinds: scalar × scalar × scalar → table

• Call: import fullseye as fs; fs.ledger.particle_image_synth(n: 'int' = 60, d_med: 'float' = 12.0, sigma_ln: 'float' = 0.35, shape=(256, 256), pitch: 'float' = 1.0, seed: 'int' = 0, gap: 'float' = 3.0, supersample: 'int' = 4) -> 'dict' (to call the implementation directly, import grind; grind.particle_image_synth(n: 'int' = 60, d_med: 'float' = 12.0, sigma_ln: 'float' = 0.35, shape=(256, 256), pitch: 'float' = 1.0, seed: 'int' = 0, gap: 'float' = 3.0, supersample: 'int' = 4) -> 'dict'; from the registry, opsdrive.get("particle_image_synth"))

Usage

Coverage image strewn with non-overlapping discs (particle projections), plus ground truth (log-normal diameters [µm], pitch µm/px).

Discs are kept at least gap px apart (fusion is a separate problem, handled by poc_particle_sizing). Default 3 px: with 2 px, the partial pixels on both sides became diagonal neighbours and 8-connected labelling merged 2 into 1 (4 of 12 images; the volume-basis D50 shifted by up to 8.5 %). Edges are anti-aliased with supersample.

Returns: image ((H, W) coverage), pitch, truth (diameters µm, centres px, touches_border). If some particles could not be placed, n_placed < n (it does not silently pack them in).

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)

• poc_dose_uniformity_from_grinding — py -3.11 examples/poc_dose_uniformity_from_grinding.py

• poc_powder_grinding_ae — py -3.11 examples/poc_powder_grinding_ae.py

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

course_layout · course_occupancy · course_contains · world_build · world_camera · world_move · lidar_scan · rss_longitudinal_same

Same category (grind)

particle_size_read · particle_size_dx · particle_size_oversize · particle_size_synth · comminution_energy · comminution_law_fit · breakage_first_order_fit · replicate_compare

*Provenance: grind.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.