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by daveslash 876 days ago
Not sure. But I'm guessing that the finder patters represent a pattern that is not possible in the data encoding. That is, according the the encoding scheme you couldn't have data that, just by chance looked like a finder pattern.

Also: A more fun and technical sounding term for "finder pattern" is "Fiducial" https://en.wikipedia.org/wiki/Fiducial_marker