We evaluate an implementation of our system against mul-tiple typefaces, font sizes, grid sizes, pixel offsets, and levels of noise. We also decode numerous real-world ex-amples of Keywords: redaction, mosaic, pixelation, blur, hidden markov models DOI 10.1515/popets-2016-0047 Received 2016-02-29; revised 2016-06-02; accepted 2016-06-02.
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