geometry op• Data kinds: image → image
• Call: fullseye.apply(img, "rotate_image", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
• HALCON equivalent: rotate_image (the HALCON reference is a useful guide to its meaning and parameters)
Rotates the image about its center by `-45 to +45 degrees (determined by a) (scipy.ndimage.rotate, with reshape=False to keep the canvas size unchanged). Areas that fall outside the frame are filled by reflection (mode="reflect"), so the four corners show a folded-back copy of the original image (a known design constraint that makes it unsuitable as-is for uses like document skew correction where you want the out-of-frame area filled with a background color). Corresponds to HALCON's rotate_image` (Rotate an image about its center).
> The detailed description below is the original text — the summary and the headings are translated.
`a が回転角を -45°〜+45° の範囲で振る。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
image as input)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
geometry)rotate_img · rescale_img · affine_warp · sk_swirl · mirror_image · transpose_region · 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.