npr op• Data kinds: कोई नहीं → table (केवल arguments से तय होने वाला op — यह कोई image या data input नहीं लेता)
• Call: 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) (implementation को सीधे call करना हो तो 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), registry से लेना हो तो opsprintpath.get("halftone_moire_period"))
2 halftone screen के बीच का beat — period और दिशा, closed form में।
> नीचे का विस्तृत विवरण मूल text में है — सारांश और headings का अनुवाद हो चुका है।
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).
• Sample data catalog (DL URL / license) — 2-D के लिए skimage.data (BSD/public) + synthetic, 3-D के लिए real data sources (Stanford/PDS आदि) के DL URL।
• Operators का स्रोत और संदर्भ — इस op family के मूल research/methods के स्रोत।
• Algorithm का मानक स्रोत (लेखक, वर्ष) और उपयोग ऊपर की family usage guide में दिए गए हैं।
• 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 को input के रूप में लेते हैं)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 operator registry. यह per-op note tools/opdocs.py md से अपने-आप generate होता है (हाथ से edit न करें)।*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.