halftone_moire_period — PRINTPATH `npr` op

• 資料種類:無 → table(僅由參數決定的運算子 —— 不接受影像或資料輸入)

• 呼叫: 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)(要直接呼叫實作,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);從台帳取用則 opsprintpath.get("halftone_moire_period"))

用法

兩張半色調網屏之間的拍頻 —— 週期與方向的閉式解。

> 以下的詳細說明為原文 —— 摘要與標題已翻譯。

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).

詳細使用指南

• printpath 族使用指南

參考(範例資料・文獻)

• 範例資料目錄(下載 URL / 授權) —— 2-D 用 skimage.data(BSD/公有領域)加合成圖,3-D 給出真實資料源(Stanford/PDS 等)的下載 URL。

• 運算子來歷與參考文獻 —— 該運算子族所依據的研究/方法出處。

• 演算法的正典(作者・年份)與用途見上面的族使用指南。

可執行的範例(實際呼叫該運算子並已驗證的樣例)

• 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

型別可銜接的下一個運算子(可接受 `table` 作為輸入)

gcode_write · gcode_extrusion_volume · gcode_time_estimate · gcode_layer_image · contours_to_gcode

同類別(`npr`)

halftone_screen · engrave_lines · hatch_field · mosaic_tiles_sites · mosaic_tiles_render

*Provenance: printpath.py — PRINTPATH 運算子登記表。本條目由 tools/opdocs.py md 自動產生(請勿手動編輯)。*

halftone_moire_period — PRINTPATH npr op

用法