geometry op• Data kinds: region → region
• Call: fullseye.apply(img, "transpose_region", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
• HALCON equivalent: transpose_region (the HALCON reference is a useful guide to its meaning and parameters)
Transposes a region (binary mask) (`x.T, a reflection about the diagonal = swapping rows and columns). The category is geometry, but the in/out type is region. Implemented as a kind of geometric transform via _sh_geom, but since transposition involves no interpolation, the value does not change even after passing through build()'s _rebinarise (it is already {0,1}). Corresponds to HALCON's transpose_region` (Reflect a region about a point) -- strictly a different transform from HALCON's "reflection about a point," approximated here as a matrix transpose = reflection about the diagonal.
> The detailed description below is the original text — the summary and the headings are translated.
`a, b` は未使用。
• gallery2d_geometry family guide
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
• gallery2d_geometry — py -3.11 examples/gallery2d_geometry.py
region as input)identity · reg_erode · reg_dilate · reg_open · reg_close · fill_holes · select_largest · remove_small
geometry)rotate_img · rescale_img · affine_warp · sk_swirl · mirror_image · rotate_image · zoom_image_factor · zoom_image_size
*Provenance: ops.py — 2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.