quaternion_to_rgb — QUAT `convert` op

• 資料種類:qimage → rgbimage

• 呼叫:import quatimage; quatimage.quaternion_to_rgb(qimage, allow_scalar: 'bool' = False) -> 'np.ndarray'(或 opsquat.get("quaternion_to_rgb"))

取四元數影像的向量部,作為線性 RGB。→ (H, W, 3)。

> 以下的詳細說明為原文 —— 摘要與標題已翻譯。

The inverse of :func:rgb_to_quaternion — and, by default, a *checked*

inverse. A quaternion image that picked up a scalar component somewhere (a

Hamilton product with a non-pure quaternion, a monogenic signal handed here

by mistake) is refused rather than silently truncated, because dropping

the `w` component is exactly the kind of loss that produces a plausible

picture from the wrong data. Pass `allow_scalar=True` to opt in to the

truncation when it is what you meant.

The tolerance is relative to the field's own peak modulus

(:data:_MONOGENIC_K_TOL, 1e-9): a quaternion image that really is pure

carries `|w|` at the 1e-17 level after a round trip through two FFTs, and

anything with a meaningful scalar part is many orders above that. Nothing

real lives in between.

Raises `ValueError: *qimage* is not a finite (H, W, 4)` array; or

it has a non-negligible scalar part and `allow_scalar` is False.

• 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。

• quaternion_monogenic — py -3.11 examples/quaternion_monogenic.py

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

quaternion_to_rgb — QUAT convert op