npr op• 数据种类:image2d → pairs
• 调用: import fullseye as fs; fs.ledger.mosaic_tiles_sites(image, n_tiles=400, iterations=12, seed=0, weighted=True)(要直接调用实现,import printpath; printpath.mosaic_tiles_sites(image, n_tiles=400, iterations=12, seed=0, weighted=True);从台账取用则 opsprintpath.get("mosaic_tiles_sites"))
在图像上运行的 Lloyd 迭代 —— 马赛克的瓷砖中心。
> 以下的详细说明为原文 —— 摘要与标题已翻译。
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.
• 示例数据目录(下载 URL / 许可证) —— 2-D 用 skimage.data(BSD/公有领域)加合成图,3-D 给出真实数据源(Stanford/PDS 等)的下载 URL。
• 算子来历与参考文献 —— 该算子族所依据的研究/方法出处。
• 算法的正典(作者、年份)与用途见上面的族使用指南。
• poc_beats_fringes_and_screens — py -3.11 examples/poc_beats_fringes_and_screens.py
pairs 作为输入)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 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.