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Based on code of Mariusz Dąbrowski from
https://groups.google.com/forum/#!msg/zxing/Xqll7VWPu0M/H--olZw_cYUJ
which was used by https://zaufanatrzeciastrona.pl/ coders from
AnonimowiAnalitycy/Z3SBarcodeScanner@3fdbad7
Explanation:
This patch improves dramatically reading of big Aztec barcodes that are used ie. for Polish Vehicle Registration certificates: see https://pl.wikipedia.org/wiki/Dow%C3%B3d_rejestracyjny_pojazdu and https://www.pwpw.pl/t/Dla_mediow/Informacje_i_komentarze/2016/03/Pwpw_50_mln_dowodow_rejes.html (Polish language pages, the second contains example certificate)
Without this patch it is almost impossible to scan such barcode. I don't see that the patch brought any regression: still I can scan other Aztec codes but now it is possible to scan the barcodes if they're bigger.