min_filter — 2D `rank` op

• Data kinds: image → image

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

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

Usage

Minimum filter within a rectangular window (equivalent to grayscale erosion). Equivalent to HALCON's `gray_erosion_rect` (Determine the minimum gray value within a rectangle.).

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

`a が窓サイズを 3,5,7,9（_k(a)）に振る。b` は未使用。明るい小さな構造（点状の輝点等）を消し、暗い領域を広げる。

Detailed usage guide

• gallery2d_smoothing_rank 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_smoothing_rank — py -3.11 examples/gallery2d_smoothing_rank.py

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

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

Same category (`rank`)

median · max_filter · percentile · sk_median_disk · cv_median · median_image · median_rect · median_separate

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

min_filter — 2D rank op