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 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).*
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.
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.
pow_image 0.50 0.50
▸ Load this pipeline · Load & run
• 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.