polar_trans_image_ext — 2D `geometry` op

• Data kinds: image → image

• Call: fullseye.apply(img, "polar_trans_image_ext", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])

• HALCON equivalent: polar_trans_image_ext (the HALCON reference is a useful guide to its meaning and parameters)

polar_trans_image_ext: 入力 → 出力

*The figure is the real output on a synthetic 128×128 input. Left: input, right: output (a non-image return value is shown as the value itself).*

Usage

Converts the entire image into a polar (radius, angle) representation (`cv2.warpPolar, forward direction, linear interpolation). The center is fixed at the image center, and the maximum radius is min(h,w)/2. a and b are unused (shares the polar branch of _sh_geom with polar_trans_image`).

> The detailed description below is the original text — the summary and the headings are translated.

HALCON の `polar_trans_image_ext`（中心・半径範囲・角度範囲などを個別指定できる、環状の一部だけを切り出して極座標変換する拡張版演算）とは異なり、この実装は画像全体を固定パラメータで変換する簡略近似 —— 環状領域や角度範囲の指定はできない。

Detailed usage guide

• gallery2d_geometry family guide

References (sample data, literature)

• 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.

Try it in Studio

The program below has been verified to run (same input as the figure). In Studio's help this block becomes buttons that load and run it on the spot.

polar_trans_image_ext 0.50 0.50

▸ Load this pipeline · Load & run

Runnable examples (verified samples that actually call this op)

• gallery2d_geometry — py -3.11 examples/gallery2d_geometry.py

Ops the type connects to (they accept `image` as input)

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

Same category (`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).*

polar_trans_image_ext — 2D geometry op