typed op• 데이터 종류: lightfield → image
• 호출: fullseye.apply(img, "tb_lf_refocus", a=0.5, b=0.5)(2-D 는 이미지 1 장 + 스칼라 노브 2 개 a,b∈[0,1] 모델)
시프트-앤드-애드 리포커스: *slope*에서 초점을 맞춘 합성 개구(synthetic-aperture) 영상.
> 아래 상세 설명은 원문입니다 —— 요약과 제목은 번역되어 있습니다.
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*.
Typed bridge of the lightfield op `lf_refocus into the 2-D evolution registry: the same implementation, called under the op(v, a, b) convention. This op has no tunable parameter; a and b` are unused.
• 샘플 데이터 카탈로그(DL URL / 라이선스) —— 2-D 는 skimage.data(BSD/public)+ 합성, 3-D 는 실데이터 소스(Stanford/PDS 등)의 DL URL.
• 연산자의 내력·참고문헌 —— 이 연산자 족의 바탕이 된 연구/기법의 출처.
• (아직 없음)
image 를 입력으로 받는 것)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
typed)tb_points_to_voxel · tb_estimate_point_normals · tb_iss_keypoints · tb_angle_3points · tb_project_points · tb_render_point_depth · tb_statistical_outlier_removal · tb_radius_outlier_removal
*Provenance: ops.py — 2D 연산자 레지스트리. 이 op 노트는 tools/opdocs.py md 가 자동 생성합니다(직접 편집하지 마세요).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.