| 摘要 |
A substrate carrying a machine-readable pattern, the pattern comprising a plurality of printed shapes, local portions of the pattern uniquely encoding respective locations of the substrate, the substrate further carrying a human-recognisable printed image, wherein the human-recognisable image is masked at locations of the printed shapes of the machine-readable pattern, thereby preventing the machine-readable pattern from being obscured by the human-recognisable printed image.
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