typed op• 資料種類:lightfield → image
• 呼叫:fullseye.apply(img, "tb_lf_synthetic_aperture", a=0.5, b=0.5)(2-D 的模型是一張圖 + 兩個純量旋鈕 a,b∈[0,1])
*圖為在 128×128 合成輸入上實際執行的輸出。左為輸入，右為輸出。點雲以俯視散點顯示(亮度 = z)，一維序列為折線，體資料為沿 z 的最大值投影，影片為中間影格，複數影像為振幅；無法成像的回傳值直接顯示數值。*
*旋鈕 a 不改變輸出(實測: 0.1 / 0.5 / 0.9 相同)。*
*旋鈕 b 不改變輸出(實測: 0.1 / 0.5 / 0.9 相同)。*
階段(前置運算子 → 本運算子，由左至右):
▸ tb_lf_synthetic_aperture: 處理階段 (文件網站)
換別的影像(合成場景 / 照片 / 硬幣。上排為輸入，下排為對應輸出。旋鈕取預設):
▸ tb_lf_synthetic_aperture: 其他輸入影像 (文件網站)
透過成形光圈重新對焦——若使用 reduce="median"，還能穿透遮蔽物。
> 以下的詳細說明為原文 —— 摘要與標題已翻譯。
Same shift-and-add geometry as lf_refocus, with two additions:
• *mask* — a (V, U) weight array from lf_aperture_mask (or your own). A small mask is a stopped-down aperture: less defocus blur, less light. None weights every view equally.
• *reduce* — how the aligned views are combined. mean is the classical (and linear) synthetic aperture. median is the interesting one: when a foreground occluder covers a *minority* of the views at a pixel, the median rejects it and the background behind it is reconstructed — looking through a fence, or through a rack of parts. max / min are the order-statistic extremes, useful for specular / shadow work. median, max and min use the mask only to *select* views (weight > 0), because an order statistic has no meaningful weighting; that is stated here rather than silently ignoring the weights.
The see-through result is not a metaphor. When fewer than half the views are blocked at a hidden pixel, more than half of them carry the identical background sample and the median is that sample exactly. Measured 2026-09-01 on a 9x9x64x64 field with an occluder covering 25% of the centre view at slope 3.0 (blocking at most 46% of the views at any hidden pixel):
RMS against the true, hidden background was 0.0 for median and 0.159 for mean, with the centre view itself at 0.280. Push the coverage to 35% (up to 60% of views blocked) and the guarantee is gone — the median lands at 0.133, worse than nothing.
Returns a (H, W) 2-D image.
Raises ValueError: *lf* not a valid light field, a *mask* whose shape is not (V, U) or which is non-finite / negative / selects no view, a non-finite or over-large *slope*, unknown *reduce* / *interp* / *edge*.
Typed bridge of the lightfield op lf_synthetic_aperture 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.
• 範例資料目錄(下載 URL / 授權) —— 2-D 用 skimage.data(BSD/公有領域)加合成圖,3-D 給出真實資料源(Stanford/PDS 等)的下載 URL。
• 運算子來歷與參考文獻 —— 該運算子族所依據的研究/方法出處。
下面的程式已確認可以執行(與圖相同的輸入)。在 Studio 說明中，此區塊會變成按鈕，可當場載入並執行。
img_to_lightfield 0.50 0.50 tb_lf_synthetic_aperture 0.50 0.50
下面的範例呼叫的是底層帳本運算子 lf_synthetic_aperture。此橋接運算子只是把同一實作適配為 fn(v, a, b) 慣例，行為完全相同(只是呼叫形式不同)。
• lightfield_depth — py -3.11 examples/lightfield_depth.py
• poc_compound_eye — py -3.11 examples/poc_compound_eye.py
image 作為輸入)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
typed)tb_points_to_voxel · tb_estimate_point_normals · tb_iss_keypoints · tb_project_points · tb_render_point_depth · tb_statistical_outlier_removal · tb_radius_outlier_removal · tb_voxel_grid_downsample
*Provenance: ops.py — 2D 運算子登記表。本條目由 tools/opdocs.py md 自動產生(請勿手動編輯)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.