Patent ID: 8275168

Claim:
A processing unit for recovering an embedded message within an input image, comprising: (i) an input for receiving said input image having logic data bit information encoded into characters within said input image; (ii) a site detection unit for identifying characters within said input image; (iii) a bit extraction unit for extracting logic data bit information from said characters to define a working set of logic bits; (iv) a detect bitstring unit for: (1) conducting a first search operation on said working set of logic bits for occurrences of a predefined indicator prefix bit-sequence; (2) reversing the bit order of said working set of logic bits and logically inverting each bit to create an inverse set of logic bits; (3) conducting a second search operation on said inverse set of logic bits for occurrences of said predefined indicator prefix bit-sequence; and (4) identifying a true set of logic bits based on the results of said first and second search operations; and (v) a decoding unit for converting said true set of logic bits to characters according to a predefined decoding scheme.