xldgeom op• 数据种类:contour → feature
• 调用:fullseye.apply(img, "xg_orientation", 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])
• HALCON 对应:orientation_points_xld(其含义与参数可参考 HALCON 手册)
主轴方向 [度],折叠到 [0,180) 并除以 180。
> 以下的详细说明为原文 —— 摘要与标题已翻译。
Angle is measured from the +x (column) axis; multiply the result by 180 to
recover degrees. Line orientation is defined mod 180, so a line at theta and
theta+180 map to the same value.
Discontinuity (inherent, documented): a line orientation lives on a circle of
180 degrees, and this op unrolls it to [0, 1), so the wrap sits at HORIZONTAL —
a line tilted +0.001 deg returns ~0.0 while -0.001 deg returns ~0.9999. Any
single-scalar unrolling has a seam somewhere; callers that need continuity
across horizontal should compare orientations on the doubled angle
(cos 2*theta, sin 2*theta) or take the difference mod 1. The closing point of a
closed contour is not double-counted in the PCA.
• 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。
• gallery2d_geometry — py -3.11 examples/gallery2d_geometry.py
feature 作为输入)xldgeom)xg_moments · xg_area_center · xg_eccentricity · xg_elliptic_axis · xg_height_width_ratio · xg_regress_contours · xg_clip_contours · xg_gen_polygons
*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.