synthesis op• 数据种类:无 → lightfield(仅由参数决定的算子 —— 不接受图像或数据输入)
• 调用: 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)(要直接调用实现,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);从台账取用则 opslightfield.get("lf_synthesize"))
• 经台账调用的返回值: fullseye.ledger.lf_synthesize(...) 只返回声明的 out 类型 lightfield 的值(底层函数还会返回辅助信息)。需要被丢弃的部分时,使用 fullseye.ledger.lf_synthesize.raw(...),或直接调用 lightfield.lf_synthesize。
用已知斜率的纹理层构建光场(试验台)。
> 以下的详细说明为原文 —— 摘要与标题已翻译。
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*.
• 示例数据目录(下载 URL / 许可证) —— 2-D 用 skimage.data(BSD/公有领域)加合成图,3-D 给出真实数据源(Stanford/PDS 等)的下载 URL。
• 算子来历与参考文献 —— 该算子族所依据的研究/方法出处。
• 算法的正典(作者、年份)与用途见上面的族使用指南。
• lightfield_depth — py -3.11 examples/lightfield_depth.py
• poc_compound_eye — py -3.11 examples/poc_compound_eye.py
lightfield 作为输入)lf_to_mla · lf_stats · lf_subaperture · lf_center_view · lf_views · lf_epi · lf_refocus · lf_focal_stack
synthesis)—
*Provenance: lightfield.py — LIGHTFIELD 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.