The 64 x 64 grid is cut into 2 x 2 tiles of 32 x 32 cells, each tile holding the same
layout, four positions a bit, so a bit keeps 16 cells and the embedding is tent64's,
spending nothing on synchronisation. Stage 1 reads the grid in place in the 8
orientations, as tent64 does. Stage 2, where stage 1 reads nothing: the tile lattice from
the exact autocorrelation (a number-theoretic transform) of a sign plane matched to the
cell pattern, eight candidates scored over their four lattice points; each folded onto one
tile by the parity of its tiles, the cells' phase by how well the tiles agree; the
orientation and the tile's offset by how many pairs of a bit's four cells agree; at most
four words decoded. Integer throughout.
The verifier dispatches over the registered schemes (§7.6's recomputation and rerun).
The battery adds crops from each side, a crop of 25%, a rotation of 5 degrees and two
simulated captures of a screen; tent64's corpus files regenerate unchanged. The scheme's
corpus files sit beside tent64's and share its frames; frames a crop, a rotation or a
capture makes are derived at verify time, not stored.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
467bb9507c