npr op• Data kinds: image2d → pairs
• Call: import fullseye as fs; fs.ledger.mosaic_tiles_sites(image, n_tiles=400, iterations=12, seed=0, weighted=True) (to call the implementation directly, import printpath; printpath.mosaic_tiles_sites(image, n_tiles=400, iterations=12, seed=0, weighted=True); from the registry, opsprintpath.get("mosaic_tiles_sites"))
Lloyd's iteration on an image — the tile centres of a mosaic.
Places *n_tiles* sites and moves each to the centroid of the pixels it owns,
weighted by local contrast when *weighted* (so detail gets smaller tiles).
★Why this earns its place: Lloyd's iteration is a descent — the
quantisation energy cannot increase — and that is a property of the algorithm,
not of the picture. The energy is *not* reported here on purpose: the existing
`stipple_energy` measures it from the sites, so the monotonicity can be
checked by an op that did not produce them. Measuring your own descent with
your own number proves nothing.
Returns `pairs`: the site coordinates (row, col).
Raises `ValueError`: fewer than 4 tiles or more tiles than pixels;
negative iterations; a non-finite or oversized image.
• 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.
• poc_beats_fringes_and_screens — py -3.11 examples/poc_beats_fringes_and_screens.py
pairs as input)stipple_energy · stroke_tour_closed · mst_length · stroke_resample_closed · stroke_tone_error · mosaic_tiles_render
npr)halftone_screen · halftone_moire_period · engrave_lines · hatch_field · mosaic_tiles_render
*Provenance: printpath.py — PRINTPATH 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.