Patent ID: 8144925

Claim:
A method of watermarking a text message onto an input image, comprising the following steps: (a) converting the text message into a binary-coded data bit sequence of logic-0 data bits and logic-1 data bits, and arranging said binary-coded data bit sequence within a message block defined by block boundaries consisting of non-data, marker bits; (b) assigning a first bit-pattern symbol to logic-0 data bits within said binary-coded data bit sequence, said first bit-pattern symbol being a first predefined geometric arrangement of disjointed rectangular segments laid out to form concentric triangular arrangements; (c) assigning a second bit-pattern symbol to logic 1 data bits within said binary-coded data bit sequence, and assigning said second bit-pattern symbol to said non-data, marker bits, said second bit-pattern symbol being a second predefined geometric arrangement of disjointed rectangular segments laid out to form concentric triangular outlines; (d) mapping a plurality of said message blocks onto said input image, and writing said first and second bit-pattern symbols on said input image in according to said mapping.