tac_shear_field — 2D tactile op

• 数据种类:image → image

• 调用:fullseye.apply(img, "tac_shear_field", a=0.5, b=0.5)(2-D 的模型是一张图 + 两个标量旋钮 a,b∈[0,1])

用法

> 该算子的说明尚无译文,以下照原文给出。

In-plane shear proxy from the 2-D structure tensor (Foerstner /

Bigun-Granlund orientation coherence). The tensor

`J = G_sigma(grad v * grad v^T)` has eigenvalues l1 >= l2, and the

coherence `(l1-l2)/(l1+l2) = sqrt((J11-J22)^2 + 4*J12^2) / (J11+J22)`

is 1 where the gel texture is stretched into a single dominant orientation

(as it is under tangential/shear load) and 0 where it is isotropic. The

result is additionally weighted by the tensor trace (gradient energy) so

that texture-free, un-contacted gel stays dark instead of amplifying noise

orientation. `a = tensor integration sigma (0.6..4.6), b` = output gain

(0.5..2.5). Output clipped to [0,1], HxW; a constant frame has zero gradient

energy and yields an all-zero shear field.

参考(示例数据・文献)

• 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。

可运行的示例(实际调用该算子并已验证的样例)

• sim2real_and_alife — py -3.11 examples/sim2real_and_alife.py

类型可衔接的下一个算子(可接受 image 作为输入)

identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter

同类别(tactile)

tac_contact_mask · tac_height_from_shading · tac_surface_normal · tac_pressure_proxy

*Provenance: ops.py — 2D 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.