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CKey-Format-v0.20.0.md
v0.1.0-build.85
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| 1 | # CKey Format v0.20.0 — Profile 3 Filled Polar Field |
| 2 | |
| 3 | Profile 3 retains the 116-unit field, ten byte-interleaved RS(255,k) blocks, |
| 4 | seven capacity/ECC tiers, deterministic visual fill, 232×232 Cartesian pitch, |
| 5 | and 576 calibrated Gray-length/stroke-weight rays. |
| 6 | |
| 7 | Its ring matrix now uses 34 concentric rings at radii `3.50 + 0.62r`, for |
| 8 | `r = 0…33`. The innermost usable ring is close to the centre and the outermost |
| 9 | is `23.96`, leaving a measurable gap before the Ring Key at radius `24.45` and |
| 10 | the Ray Key at radius `26.30`. Dots remain radius `0.075`; capacity comes from |
| 11 | filling unused radial space, not shrinking dots. |
| 12 | |
| 13 | Cartesian payload sites reserve a 5-unit border moat. This prevents data from |
| 14 | spilling into the 2.6-unit rounded frame under anti-aliasing, display blur, or |
| 15 | camera blur. The Grid Key remains four ordinary `.34` marks on `.5` pitch. |
| 16 | |
| 17 | Encoders emit frame format byte `0x14` (decimal 20), profile byte `0x03`. |
| 18 | This changes the codeword-to-site mapping and requires the v0.20 sampling map. |