total_length — 2D `features` op

• Data kinds: contour → feature

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

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

total_length: 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

A feature that returns the total arc length of all XLD contours. Equivalent to HALCON's `length_xld` (Length of contours or polygons.).

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

`a, b` は未使用。各輪郭について隣接点間のユークリッド距離を足し合わせたもの（折れ線の全長）を、全輪郭ぶん合算する。点が 2 点未満の輪郭は長さ 0 として扱われる。

Detailed usage guide

• gallery2d_features 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.

threshold 0.50 0.50
sk_find_contours 0.50 0.50
total_length 0.50 0.50

▸ Load this pipeline · Load & run

Runnable examples (verified samples that actually call this op)

• gallery2d_features — py -3.11 examples/gallery2d_features.py

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

identity

Same category (`features`)

blob_count · area_frac · count_contours · vol_count · sk_euler · sk_entropy_feat · sk_blur_effect · cv_cc_count

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

total_length — 2D features op