refocus oplightfield → image2dimport fullseye as fs; fs.ledger.lf_refocus(lf, slope=0.0, *, interp='linear', edge='nearest') (実装を直接呼ぶなら import lightfield; lightfield.lf_refocus(lf, slope=0.0, *, interp='linear', edge='nearest')、台帳から引くなら opslightfield.get("lf_refocus"))Shift-and-add refocus: the synthetic-aperture image focused at slope.
Every view (v, u) is shifted by (-s*(v - v_c), -s*(u - u_c)) — the
minus undoes the parallax of a point at slope s — and the shifted
views are averaged. Points at that slope add coherently and stay sharp;
everything else is smeared by an amount proportional to its slope
difference times the angular baseline. slope=0 is the plane the array
was already focused on and returns the plain average of the views.
Ground truth it reproduces exactly (pinned in tests/test_lightfield.py):
a single-layer field synthesised at slope s0 and refocused at s0
with edge="wrap" and an integer s0 returns the original texture to
5.6e-16; sweeping the slope, the variance of the result peaks at s0
(measured exactly on the sweep grid in all 18 texture/slope combinations
listed in the module docstring), and refocusing at -s0 does not —
which is the check that catches a flipped shift sign.
Returns a (H, W) 2-D image.
Raises ValueError: lf not a valid light field, a non-finite or
over-large slope (:data:MAX_ABS_SLOPE), unknown interp / edge.
py -3.11 examples/lightfield_depth.pypy -3.11 examples/poc_lightfield_depth.pyimage2d を入力に取れる)lf_from_mla · lf_disparity_to_depth · lf_all_in_focus
refocus)lf_focal_stack · lf_aperture_mask · lf_synthetic_aperture
Provenance: lightfield.py — LIGHTFIELD 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.