envelope op• Datenarten: sweep → signal
• Aufruf: import fullseye as fs; fs.ledger.csi_envelope(signal, remove_bias=True) (die Implementierung direkt: import interferometry; interferometry.csi_envelope(signal, remove_bias=True); aus dem Register: opsinterferometry.get("csi_envelope"))
Kohärenzhüllkurve eines z-Scan-Interferogramms (Betrag des analytischen Signals).
> Die ausführliche Beschreibung unten ist der Originaltext — Zusammenfassung und Überschriften sind übersetzt.
dsp.envelope computes |hilbert(x)| for any 1-D signal and is called here verbatim, so the two can never drift apart. The one thing added is the one thing an interferogram needs and a generic signal does not: removal of the intensity pedestal. An interferogram is a + b*V(z)*cos(...) with a > 0, and the analytic-signal magnitude of that is not b*V — the DC term passes through the Hilbert transform untouched and dominates.
Measured on the module's reference scan (a = 0.5, b = 0.4, envelope sigma 1.2 um, surface centred): with the bias removed the envelope matches the analytic b*V(z) to 1.83e-07; without it, the error is 0.5 — the entire pedestal — and the recovered "envelope" never goes near zero. dsp.envelope called directly on the same raw interferogram gives that identical 0.5, which is the honest statement of what this operator adds. That is why remove_bias defaults to True; False is available for a scan whose pedestal you have already removed some other way, and it is your statement that you did.
signal: 1-D scan intensities ((n,), n >= 3).
remove_bias: subtract the scan mean before the transform.
Returns a 1-D float64 envelope of the same length.
Raises ValueError: a non-1-D, empty, too-short (< 3), non-finite, complex or masked *signal*, a *signal* over MAX_SCAN_POINTS elements (checked before the float64 promotion), or a non-bool *remove_bias*.
• Leitfaden zur Familie coherence_scanning
• Katalog der Beispieldaten (Download-URLs / Lizenzen) — 2-D nutzt skimage.data (BSD/Public Domain) plus synthetische Bilder, 3-D nennt Download-URLs echter Datenquellen (Stanford, PDS, …).
• Herkunft und Literatur der Operatoren — die Quellen der Forschung/Verfahren, auf denen diese Operatorfamilie beruht.
• Der kanonische Algorithmus (Autor, Jahr) und seine Anwendungen stehen im Familienleitfaden oben.
• coherence_scanning — py -3.11 examples/coherence_scanning.py
signal als Eingabe)—
envelope)—
*Provenance: interferometry.py — INTERFEROMETRY Operator-Registry. Diese Notiz wird von tools/opdocs.py md erzeugt (nicht von Hand bearbeiten).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.