gen_gabor — 2D `texture` op

• Data kinds: image → image

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

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

gen_gabor: 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

Returns the absolute value of the convolution response from a single Gabor kernel (orientation `theta=pi*a, frequency 0.1+0.3*b), normalized by the kernel's L1 norm. A real-part-only kernel with the DC component removed (mean subtracted), acting as a band-pass texture filter that responds selectively to stripe patterns of the specified direction and frequency. Corresponds to HALCON's gen_gabor` (Generate a Gabor filter) -- a simplified version using only a real kernel with no imaginary part / phase.

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

`a が向き θ(0〜180°)を、b` が空間周波数(0.1〜0.4)を振る。両方が

使われる。`a=0 が縦縞、a=0.5`(90°)が横縞に応答する規約。

Detailed usage guide

• gallery2d_texture_freq 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.

gen_gabor 0.50 0.50

▸ Load this pipeline · Load & run

Runnable examples (verified samples that actually call this op)

• gallery2d_texture_freq — py -3.11 examples/gallery2d_texture_freq.py

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

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

Same category (`texture`)

std_filter · gabor · sk_frangi · sk_meijering · sk_hessian · sk_gabor · sk_lbp · sk_entropy

*Provenance: ops.py — 2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

gen_gabor — 2D texture op