cooc_feature_matrix — 2D `texture` op

• Data kinds: image → feature

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

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

cooc_feature_matrix: 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

Computes the Haralick texture feature `energy (angular second moment, i.e., how concentrated the matrix values are = texture uniformity) from a gray-level co-occurrence matrix (GLCM, skimage.feature.graycomatrix, quantized to 16 levels, distance 1+3*a, angle 0 degrees). Equivalent to HALCON's cooc_feature_matrix` (Calculate gray value features from a co-occurrence matrix.) (HALCON can return multiple features and multiple angles simultaneously, but this is simplified to energy at a fixed 0-degree angle).

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

`a が共起を取る画素間距離を 1〜4 の範囲で振る。b` は未使用。

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.

cooc_feature_matrix 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 `feature` as input)

identity

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).*

cooc_feature_matrix — 2D texture op