img_to_signal — 2D `bridge` op

• Data kinds: image → signal

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

img_to_signal: input → output

*The figure is the actual output on a synthetic 128×128 input. Left: input, right: output. Point clouds are drawn as a top-down scatter (brightness = z), 1-D series as a line plot, volumes as the maximum-intensity projection along z, videos as the middle frame, complex images as magnitude; return values that are not pictures are shown as the values themselves.*

Sweeping knob a (0.1 / 0.5 / 0.9, the other knob at its default):

▸ img_to_signal: knob a sweep (docs site)

Sweeping knob b (0.1 / 0.5 / 0.9, the other knob at its default):

▸ img_to_signal: knob b sweep (docs site)

On other images (synthetic scene / photo / coins. Top row: inputs, bottom row: their outputs. Knobs at default):

▸ img_to_signal: other inputs (docs site)

*The 4th column is a colour (H,W,3) input. This op handles colour without crossing channels (it does not convolve the colour channel as a third spatial axis).*

Usage

Take the intensity profile of one row (or column) of the image as a 1-D signal.

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

• `a → 位置。b < 0.5 なら行 r = round(a * (H-1))` を横に読む(長さ W)、

`b ≥ 0.5 なら列 c = round(a * (W-1))` を縦に読む(長さ H)。a=0.5 は中央。

• 返り値: 1-D float64、値はそのまま(正規化しない。画像が [0,1] なら [0,1])。

• 補間はしない(画素の値をそのまま並べる)。斜めの線が要るなら `line_profile`

(台帳)を使う。

使いどころ: 1-D 関数の族(`tb_smooth_funct_1d_gauss / tb_derivate_funct_1d` /

`tb_bandpass` …)を画像の断面で試す入口。周期構造(市松・縞)を横切る行を

選ぶとスペクトル系 op の効果が見える。

Detailed usage guide

• gallery2d_bridge 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.

img_to_signal 0.50 0.50

▸ Load this pipeline · Load & run

Runnable examples (verified samples that actually call this op)

• gallery2d_bridge — py -3.11 examples/gallery2d_bridge.py

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

identity · tb_create_funct_1d_array · tb_smooth_funct_1d_gauss · tb_smooth_funct_1d_mean · tb_derivate_funct_1d · tb_integrate_funct_1d · tb_zero_crossings_funct_1d · tb_abs_funct_1d

Same category (`bridge`)

img_to_points · img_to_keypoints · img_to_projection_profile · img_to_counts · img_to_matrix · img_to_video · img_to_volume · img_to_lightfield

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

img_to_signal — 2D bridge op