features op• Data kinds: image → feature
• Call: fullseye.apply(img, "cv_good_features", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
*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).*
High-quality corner detection via the Shi-Tomasi method (a single scalar feature, OpenCV implementation). Evaluates "corner-ness" using the same minimum-eigenvalue criterion as cv_min_eigen, and detects the top corners after thinning them out with non-maximum suppression and a minimum-distance filter - here, only the number of detected corners is returned (0 if none).
> The detailed description below is the original text — the summary and the headings are translated.
HALCON に直接対応するものは無い。実装は `cv2.goodFeaturesToTrack(v, maxCorners=int(10+40*a), qualityLevel=0.01+0.1*b, minDistance=5)` —— a は検出上限数を 10〜50 に、b は品質しきい値(最強コーナーに対する相対比。大きいほど厳しく絞り込まれ検出数が減る)を 0.01〜0.11 に振る。最小距離は 5 画素に固定。
• gallery2d_features family guide
• 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.
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.
cv_good_features 0.50 0.50
▸ Load this pipeline · Load & run
• gallery2d_features — py -3.11 examples/gallery2d_features.py
feature as input)features)blob_count · area_frac · count_contours · total_length · vol_count · sk_euler · sk_entropy_feat · sk_blur_effect
*Provenance: ops.py — 2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.