gray op• Data kinds: image → image
• Call: fullseye.apply(img, "pow_image", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
• HALCON equivalent: pow_image (the HALCON reference is a useful guide to its meaning and parameters)
The implementation points to exactly the same function as `gamma_image (the kind: "gamma" branch of _sh_lut). In other words, pow_image and gamma_image produce identical computed results on this backend - in HALCON they are separate operators (pow_image, which explicitly specifies an exponent, and gamma_image`, intended for encoding/decoding), but here the stand-in implementations happen to overlap (noted explicitly as a limitation of the approximation).
> The detailed description below is the original text — the summary and the headings are translated.
`a がべき指数を 0.3〜2.8 の範囲で振る。b` は未使用。HALCON の
`pow_image`（Raise an image to a power.）の代役。
• gallery2d_gray_arith 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_gray_arith — py -3.11 examples/gallery2d_gray_arith.py
image as input)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
gray)gamma · invert · scale_clip · equalize · sigmoid · clahe · sk_adapthist · sk_enhance_contrast
*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.