qr_sample — SYMBOL `datacode2d` op

• Data kinds: image2d → table

• Call: import fullseye as fs; fs.ledger.qr_sample(image, located=None) -> 'dict' (to call the implementation directly, import qrsym; qrsym.qr_sample(image, located=None) -> 'dict'; from the registry, opssymbol.get("qr_sample"))

• GPU: none (CPU reference implementation only)

Usage

Sample the reflectance at QR module centres by bilinear interpolation and binarise with a global threshold (table).

Sample module-centre reflectance (bilinear) and binarise with one global threshold midway between the dark- and light-module means (refined iteratively). Returns reflectance (N,N), modules (N,N) uint8 (dark=1), threshold, homography and centers (N,N,2) pixel (row, col).

Detailed usage guide

• symbol_reading 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)

• poc_symbol_part_dpm — py -3.11 examples/poc_symbol_part_dpm.py

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

render_symbol · symbol_read_trials · symbol_read_pod · ocr_classify · ocr_read_line · ocr_read_trials

Same category (`datacode2d`)

qr_encode · qr_decode_modules · qr_locate · qr_read · dm_encode · dm_decode_modules · dm_locate · dm_sample

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

qr_sample — SYMBOL datacode2d op