quat_conjugate_image — QUAT algebra op

• Data kinds: qimage → qimage

• Call: import quatimage; quatimage.quat_conjugate_image(qimage) -> 'np.ndarray' (or opsquat.get("quat_conjugate_image"))

Usage

Per-pixel quaternion conjugate `(w, -x, -y, -z)`. → (H, W, 4).

Exact and involutive: `quat_conjugate_image(quat_conjugate_image(q)) is q`

to the last bit (a sign flip is exact in IEEE 754). Agrees with

`pose_quat.quat_conjugate` per pixel, asserted in the tests.

Detailed usage guide

• quaternion_monogenic family guide

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• quaternion_monogenic — py -3.11 examples/quaternion_monogenic.py

Ops the type connects to (they accept qimage as input)

quaternion_to_rgb · quat_norm · quat_normalize_image · quat_image_multiply · monogenic_amplitude · monogenic_phase · monogenic_orientation · quat_color_rotate

Same category (algebra)

quat_normalize_image · quat_image_multiply

*Provenance: quatimage.py — QUAT operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.