dm_decode_modules — SYMBOL `datacode2d` op

• Data kinds: matrix → table

• Call: import fullseye as fs; fs.ledger.dm_decode_modules(modules) -> 'dict' (to call the implementation directly, import dmsym; dmsym.dm_decode_modules(modules) -> 'dict'; from the registry, opssymbol.get("dm_decode_modules"))

• GPU: none (CPU reference implementation only)

Usage

Decode a Data Matrix module grid (with L finder and clock track, 0/1) and return the corrected codewords (table).

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

Decode an (R, C) 0/1 module matrix that includes the finder L and the clock track. The grid may be given in any of the 4 rotations, optionally mirrored; the orientation is found from the function pattern (solid L + clock) and, when the pattern alone is ambiguous (a square symbol and its anti-diagonal mirror share it), from which orientation passes Reed-Solomon.

Returns

dict

text, rows, cols, n_corrected, block_corrected [int],

block_ec [EC 語数], block_capacity [floor(n_ec/2)], finder_errors

(機能 module の不一致数), codeword_index(正規化後の向き)、rotation

(度、0/90/180/270)と mirrored: 正規化 =

np.rot90(np.fliplr(g) if mirrored else g, rotation // 90)、modules(正規化後)、

codewords_raw / codewords(訂正前後、送出順)、encodations、

fixed_errors(右下固定 2x2 の不一致数、無ければ 0)。

Raises

ValueError

2-D でない・0/1 以外・NaN。

DMDecodeError

どの向きでも対応する大きさにならない、機能パターンが崩れすぎ、RS 訂正不能、符号化の矛盾。

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_sample · qr_read · dm_encode · dm_locate · dm_sample

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

dm_decode_modules — SYMBOL datacode2d op