stroke op• Data kinds: image2d → pairs
• Call: import fullseye as fs; fs.ledger.stipple_points_from_image(image, n_points, iterations=30, gamma=1.0, floor=0.02, seed=0, metric='euclidean') (to call the implementation directly, import printpath; printpath.stipple_points_from_image(image, n_points, iterations=30, gamma=1.0, floor=0.02, seed=0, metric='euclidean'); from the registry, opsprintpath.get("stipple_points_from_image"))
Maps grey levels to point density (weighted Lloyd = centroidal Voronoi). → pairs
Points gather densely where it is dark. Returns (n_points, 2) as (row, col).
Args:
image: 2-D brightness in [0, 1] (or colour; reduced to luminance).
n_points: number of points.
iterations: number of iterations of Lloyd.
gamma: makes the weight darkness ** gamma (1 = darkness as is).
floor: lower bound of the weight. Do not set it to 0 -- if the weight of a pure-white region is exactly 0,
points that enter it cannot move (centroid 0/0) and their positions stop depending on the input.
seed: random numbers for the initial placement.
metric: currently only "euclidean".
Besides the return value, convergence can be measured by calling stipple_points_from_image with different iterations and comparing (Lloyd's energy decreases monotonically).
★Even on a pure-white image the points spread evenly (with constant density, centroidal Voronoi is uniform). That serves as the control group for "it can actually read tone".
• 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_one_stroke_epicycles — py -3.11 examples/poc_one_stroke_epicycles.py
pairs as input)stipple_energy · stroke_tour_closed · mst_length · stroke_resample_closed · stroke_tone_error · mosaic_tiles_render
stroke)stipple_energy · stroke_tour_closed · mst_length · stroke_resample_closed · stroke_tone_error
*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.