geometry op• Data kinds: image → image
• Call: fullseye.apply(img, "projective_trans_image", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
• HALCON equivalent: projective_trans_image (the HALCON reference is a useful guide to its meaning and parameters)
Perspective (projective) transformation (`cv2.warpPerspective). Creates a trapezoidal (perspective-distorted) warp by pulling the top two of the four corners inward by a ratio of d=0.06+0.12*a. Areas outside the frame are filled by reflection. Corresponds to HALCON's projective_trans_image` (Apply a projective transformation to an image.) (HALCON can take an arbitrary homography matrix, but this is an approximation limited to a single trapezoidal-distortion pattern).
> The detailed description below is the original text — the summary and the headings are translated.
`a が歪みの強さを、b` が左右の非対称さ(どちら側をより歪ませるか)を
振る。両方が使われる。
• 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 · rotate_image · zoom_image_factor
*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.