quaternion_to_rgb — QUAT `convert` op

• 数据种类:qimage → rgbimage

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

取四元数图像的向量部,作为线性 RGB。→ (H, W, 3)。

> 以下的详细说明为原文 —— 摘要与标题已翻译。

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.

• 示例数据目录(下载 URL / 许可证) —— 2-D 用 skimage.data(BSD/公有领域)加合成图,3-D 给出真实数据源(Stanford/PDS 等)的下载 URL。

• 算子来历与参考文献 —— 该算子族所依据的研究/方法出处。

• 算法的正典(作者・年份)与用途见上面的族使用指南。

• quaternion_monogenic — py -3.11 examples/quaternion_monogenic.py

*Provenance: quatimage.py — QUAT 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*

quaternion_to_rgb — QUAT convert op