Generating digital watermark decoder, digital watermarking, method of providing a signal digital watermark according to data binary message, method for providing data of binary message based on a signal digital watermark and computer program that uses a two-dimensional scattering bits

摘要

A generator watermark (101; 2400) to provide a signal watermarking (101b; 2420) enfunción data binary message (101a; 2410), the generator watermark comprising: an information processor (303 , 304, 305) configured to provide, depending on one bit demensaje data binary message information dimensional propagation (b (i, j); 2432) querepresenta the message bit in the form of a set of values domain-frequency-time; and a signal provider watermark (306, 307), configured to provide the digital signal Deagu mark from bidimensional propagation information; wherein the information processor is configured to propagate a first message bit in a primeradirección spread using a first spreading sequence (cf) and to propagate a segundobit message in the first propagation direction using the first spreading sequence ( cf) to obtain a representation of intermediate information (303a, cf · m), to combine the intermediate Infomessages representation with a representation of overlay information (S) to obtain unarepresentación combined information (C) and spread information representation combined ina second direction using a second spreading sequence (ct), to obtain lainformación dimensional propagation, wherein the information processor is configured to combine representation informaciónintermedia with a representation of overlay information, which propagates in the direcciónde first propagation ng using a plurality of sequences of spread (a, b) information desuperposición, so that the first bit of message propagation is multiplied with a primerasecuencia propagation overlay information (a), and such that the second demensaje bit propagation is multiplied with a second spreading sequence (b) information desuperposición, wherein the first spreading sequence of overlay information and lasegunda sequence spread overlay information are orthogonal.