barcode op• Data kinds: image → feature
• Call: fullseye.apply(img, "decode_barcode", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
• HALCON equivalent: find_bar_code (the HALCON reference is a useful guide to its meaning and parameters)
*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):
▸ decode_barcode: knob a sweep (docs site)
*Knob b does not change the output (measured: identical at 0.1 / 0.5 / 0.9).*
A simplified barcode-like feature that counts the number of light/dark transitions along the central scan line. This resembles but is not the same as HALCON's find_bar_code (Detect and read bar code symbols in an image.) - it performs no symbology determination or data decoding whatsoever (it only counts the "number" of bars).
a sweeps the threshold regarded as "dark" over 0.3〜0.7. b is unused. It looks only at the central row of the image (v.shape[0]//2) and, on the sequence where pixels with v < threshold are 1, counts the number of rising edges 0→1 (the number of dark bars). The actual barcode data (digits, strings) is not obtained.
• gallery2d_physics_alife_3d 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.
decode_barcode 0.50 0.50
▸ Load this pipeline · Load & run
• gallery2d_physics_alife_3d — py -3.11 examples/gallery2d_physics_alife_3d.py
• poc_barcode_1d — py -3.11 examples/poc_barcode_1d.py
feature as input)barcode)—
*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.