Patent ID: 8162222
Filing Date: 2012-04-24
Classification: G06K

Abstract:
1. A method for identifying a codeword in a two-dimensional symbol as an erasure, the two-dimensional symbol having data that is encoded with a mask, the method, comprising: comparing an unmasked codeword in the two-dimensional symbol with a portion of the mask, the mask being used for encoding data in the two-dimensional symbol, wherein the unmasked codeword is generated by applying the portion of the mask to the codeword, and wherein the portion of the mask corresponds with a location of the codeword in the two-dimensional symbol; and determining whether the codeword is an erasure based on the comparison of the unmasked codeword with the portion of the mask, by comparing a codeword bit value of multiple codeword bits in the unmasked codeword with a corresponding mask bit value of multiple mask bits of the portion of the mask.