lf_focal_stack — LIGHTFIELD refocus op

• Data kinds: lightfield → images

• Call: import lightfield; lightfield.lf_focal_stack(lf, slopes=(-2.0, -1.0, 0.0, 1.0, 2.0), *, interp='linear', edge='nearest') (or opslightfield.get("lf_focal_stack"))

Usage

Refocus at every slope in *slopes* — a focal stack from one exposure.

Returns a `list of (H, W) images (the images` type), in the order

given, so :mod:focus_stack's fusion and any multi-image operator applies

unchanged. The physical camera equivalent is racking the focus N times; here

it costs one exposure and `len(slopes) * V * U` image shifts.

Raises `ValueError`: *lf* not a valid light field, *slopes* empty or

longer than :data:MAX_STACK_SLICES, any slope non-finite or over

:data:MAX_ABS_SLOPE, a stack larger than :data:MAX_STACK_ELEMENTS,

unknown *interp* / *edge*.

Detailed usage guide

• lightfield_depth 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)

• lightfield_depth — py -3.11 examples/lightfield_depth.py

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

—

Same category (refocus)

lf_refocus · lf_aperture_mask · lf_synthetic_aperture

*Provenance: lightfield.py — LIGHTFIELD 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.