riesz opqimage → image2dimport fullseye as fs; fs.ledger.monogenic_phase(qimage, display: 'bool' = False) -> 'np.ndarray' (実装を直接呼ぶなら import quatimage; quatimage.monogenic_phase(qimage, display: 'bool' = False) -> 'np.ndarray'、台帳から引くなら opsquat.get("monogenic_phase"))Local phase atan2(|R|, f) of a monogenic signal. → (H, W).
In [0, pi] — the monogenic phase is measured against the magnitude of
the Riesz vector, whose sign is carried by the orientation instead, so the
range is a half turn rather than a full one. That is the standard
convention (Felsberg & Sommer) and it is stated here because a caller
arriving from complexops.cx_phase (whose raw range is (-pi, pi]) will
otherwise assume a full turn and see a “wrapped” map that is not wrapped.
display=True maps [0, pi] to [0, 1] for viewing; the default is
False — the opposite of cx_phase’s default, deliberately,
because the consumers of this quantity in this module are numerical, and a
display scaling that arrives silently in a measurement is a factor of pi
that nothing announces.
Phase is the quantity a translation shifts linearly, which is why the whole
motion half of this module reads it. For an edge, phase 0 means the peak of
a bright line, pi/2 a step edge and pi the peak of a dark line — the
local structure type, independent of contrast.
Raises ValueError: the input is not a valid quaternion field, or its
k component is non-zero; display is not a bool.
py -3.11 examples/quaternion_monogenic.pyimage2d を入力に取れる)riesz_transform · monogenic_signal
riesz)riesz_transform · monogenic_signal · monogenic_amplitude · monogenic_orientation
Provenance: quatimage.py — QUAT operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.