halftone_moire_period — PRINTPATH `npr` op

• 数据种类:无 → table(仅由参数决定的算子 —— 不接受图像或数据输入)

• 调用: import fullseye as fs; fs.ledger.halftone_moire_period(lpi_a=60.0, angle_a_deg=45.0, lpi_b=60.0, angle_b_deg=75.0, pixel_um=25.4)(要直接调用实现,import printpath; printpath.halftone_moire_period(lpi_a=60.0, angle_a_deg=45.0, lpi_b=60.0, angle_b_deg=75.0, pixel_um=25.4);从台账取用则 opsprintpath.get("halftone_moire_period"))

用法

两张半色调网屏之间的拍频 —— 周期与方向的闭式解。

> 以下的详细说明为原文 —— 摘要与标题已翻译。

Each screen is a frequency vector `f (cos t, sin t)`; where two screens

overlap the visible moiré is the difference vector, so its period is

`1 / |f_a - f_b|` and its direction is that of the difference. For equal

rulings the magnitude reduces to `2 f sin(dt / 2)`, which is why the beat

period grows without bound as the angle difference goes to zero — two plates

at nearly the same angle give a huge, very visible moiré.

★Why this earns its place: the prediction is available before any

screen is drawn, and :func:halftone_screen plus an FFT can measure the beat

out of the picture. Two independent routes to one number.

Returns a `table: period_px, angle_deg, freq_cycles_per_px`.

Raises `ValueError`: non-positive ruling or pitch; two screens that are

identical in both ruling and angle (the difference vanishes — there is no

beat, and returning `inf` silently would be worse than saying so).

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

• poc_moire_screen — py -3.11 examples/poc_moire_screen.py

• poc_print_registration — py -3.11 examples/poc_print_registration.py

类型可衔接的下一个算子(可接受 `table` 作为输入)

gcode_write · gcode_extrusion_volume · gcode_time_estimate · gcode_layer_image · contours_to_gcode

同类别(`npr`)

halftone_screen · engrave_lines · 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)。*

halftone_moire_period — PRINTPATH npr op

用法