bandpass_image — 2D `frequency` op

• Data kinds: image → image

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

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

Usage

> This operator's description has not been translated yet. The original text follows as it is.

周波数領域で指定した帯域だけを通すバンドパスフィルタ(低域と高域を

遮断)、逆 FFT で実空間に戻す。`highpass_image` と同様に零平均の符号つき

応答なので `signed01 で [0,1] に写像する。HALCON の bandpass_image`

（Edge extraction using bandpass filters.）に相当。

`a が下限カットオフ、b` が上限カットオフを振る。両方が使われる。

帯域(`b` 側の上限)を下限より下に設定すると通過域が空になり出力はほぼ

0.5(ゼロ)一色になる。

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.

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 (`frequency`)

lowpass · highpass · sk_butterworth · fft_image · power_real · power_byte · phase_rad · highpass_image

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

bandpass_image — 2D frequency op