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"))
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 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).
• 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。
• 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
table 作為輸入)gcode_write · gcode_extrusion_volume · gcode_time_estimate · gcode_layer_image · contours_to_gcode
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)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.