synthesis op• データ種: なし → lightfield(引数だけで決まる op —— 画像やデータの入力を取らない)
• 呼び出し: import fullseye as fs; fs.ledger.lf_synthesize(slopes=(0.0,), angular=(5, 5), shape=(64, 64), *, occlusion=True, coverage=0.55, texture_sigma=2.0, interp='linear', edge='wrap', seed=0) (実装を直接呼ぶなら import lightfield; lightfield.lf_synthesize(slopes=(0.0,), angular=(5, 5), shape=(64, 64), *, occlusion=True, coverage=0.55, texture_sigma=2.0, interp='linear', edge='wrap', seed=0)、台帳から引くなら opslightfield.get("lf_synthesize"))
• 台帳経由の戻り値: fullseye.ledger.lf_synthesize(...) は宣言 out 型 lightfield の値だけを返す(本体は補助情報も返す)。捨てられた側が要るときは fullseye.ledger.lf_synthesize.raw(...)、または lightfield.lf_synthesize を直接呼ぶ。
Build a light field of textured layers at known slopes (the test bed).
Each entry of *slopes* is one fronto-parallel layer, given as its slope s = dx/du in pixels of image shift per angular step; the layer's texture is band-limited noise (Gaussian-smoothed, texture_sigma px) and view (v, u) sees it displaced by (s*(v - v_c), s*(u - u_c)). Because the displacement is exactly linear in the angular index, every downstream answer is closed-form: the refocus sharpness peaks at s, the EPI lines have slope s, and the disparity between the extreme views is s * (U - 1).
*angular* is (V, U) and *shape* is (H, W).
With occlusion=True (default) the layers are composited front-to-back by |slope| (largest |s| = nearest = drawn last) through random binary masks covering roughly *coverage* of the frame, and the layer with the smallest |slope| is forced opaque as the background — regardless of its position in *slopes* (a tie goes to the earlier entry, the sort is stable). (0.0, 2.0) and (2.0, 0.0) therefore describe the same scene with the same slope_map; only the per-layer textures are drawn in a different order. That is what makes a see-through synthetic-aperture test meaningful. With occlusion=False the layers are averaged instead — a transparent superposition, which is the cleanest possible input for refocusing because each layer survives the average untouched.
Returns (light_field, slope_map): the (V, U, H, W) array and the (H, W) map of the front-most layer's slope at each pixel — the ground truth for lf_depth_from_focus and lf_epi_slope. The map is in centre-view coordinates (the masks are stated unshifted, and the centre view is the one view whose shift is zero), which is also the frame a refocused image lands in. With occlusion=False the light field also contains the *other* layers at every pixel, so a depth estimator will legitimately disagree with the map wherever layers overlap; the single-layer case is unambiguous and is what the exactness tests use.
edge="wrap" (default) makes the scene periodic so an integer slope is a pure np.roll and the whole pipeline is bit-exact end to end (measured round-trip error 5.6e-16); edge="nearest" reproduces a real camera's border clamping.
Raises ValueError: an empty or over-long *slopes* list (MAX_LAYERS), a non-finite or over-large slope (MAX_ABS_SLOPE), an angular or spatial shape outside [1, MAX_ANGULAR] / [1, MAX_SPATIAL], a total size over MAX_LF_ELEMENTS, *coverage* outside (0, 1], a *texture_sigma* so large the smoothed texture's dynamic range falls below MIN_TEXTURE_RANGE, and an unknown *interp* / *edge*.
• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。
• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。
• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。
• lightfield_depth — py -3.11 examples/lightfield_depth.py
• poc_compound_eye — py -3.11 examples/poc_compound_eye.py
lightfield を入力に取れる)lf_to_mla · lf_stats · lf_subaperture · lf_center_view · lf_views · lf_epi · lf_refocus · lf_focal_stack
synthesis)—
*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.