engrave_lines — PRINTPATH `npr` op

• 数据种类:image2d → image2d

• 调用: import fullseye as fs; fs.ledger.engrave_lines(image, spacing_px=6.0, angle_deg=0.0, gamma=1.0, max_width=0.95)(要直接调用实现,import printpath; printpath.engrave_lines(image, spacing_px=6.0, angle_deg=0.0, gamma=1.0, max_width=0.95);从台账取用则 opsprintpath.get("engrave_lines"))

用法

铜版雕刻 —— 平行线的宽度承载灰阶。

> 以下的详细说明为原文 —— 摘要与标题已翻译。

★Why this earns its place: while the lines do not touch, the ink coverage

of a ruling of width `w and spacing d is exactly w / d`. So the width

needed for a target tone is solved, not tuned: `w = (1 - tone) * d`. The

op therefore has a closed form to be graded against — blur the result and the

local mean must come back to the tone you asked for.

Parameters

----------

image : 2-D array in [0, 1]

spacing_px : float

Line spacing. The finest tone step a ruling can hold is `1 / spacing`.

angle_deg : float

gamma : float

Tone shaping applied before solving for the width (`tone**gamma`).

max_width : float

Widest line as a fraction of the spacing; 1.0 would make solid black and

lose the ruling.

Returns an `image2d`: 1 = paper, 0 = ink.

Raises `ValueError`: spacing below 2 px (the ruling cannot be sampled);

`max_width` outside (0, 1]; non-positive gamma; a non-finite or oversized image.

详细使用指南

• printpath 族使用指南

参考(示例数据・文献)

• 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。

可运行的示例(实际调用该算子并已验证的样例)

• poc_beats_fringes_and_screens — py -3.11 examples/poc_beats_fringes_and_screens.py

类型可衔接的下一个算子(可接受 `image2d` 作为输入)

stipple_points_from_image · stipple_energy · stroke_tone_error · halftone_screen · hatch_field · mosaic_tiles_sites · mosaic_tiles_render · print_layer_defect_map

同类别(`npr`)

halftone_screen · halftone_moire_period · hatch_field · mosaic_tiles_sites · 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)。*

engrave_lines — PRINTPATH npr op

用法