Method and systems for inserting watermarks in digital signals

SIGNALS WITH ROUGHLY GAUSSIAN DISTRIBUTION

ABOUT SOME MEAN VALUE, WHERE SIGNALS HAVE

EQUAL EXTENT AND DIGITAL SPACING OF
ORIGINAL DIGITAL SIGNAL OR IMAGE

T I I P
CONDENSE N RANDOM SIGNALS TO A LOWEST
ACCEPTABLE BIT VALUE II= MEMORY OR

i GTORAGE SPACE+IS AT A PREMIUM _

ADD ALL RANDOM IMAGES TOGETHER WHICH HAVE
A CORRESP

GENERATE OR SYNTHESIZE N "RANDOM" INDEPENDENT‘

I O 7 STORE AWAY AND SECURE ORIGINAL SIGNAL OR IMAGE, ALONG WITH N-BIT IDENTIFICATION WORO AND O f _ THEN RANDOM SIGNALS __ _ I 7

I

IIGELL OR OIGTRIBUTETTRE DISTRIBDTABLE SIGNAL OR IMAGE]

OF SUSPECT SIGNAL OR IMAGE

F|G_ 3 [OBTAIN o1c§|TA1. on NON-DIGITAL QQPYI 2 2 2 7 2

I DIGITIZE IF NOT ALBEADY DIGITAL! fl
CUT AND MASK Po|=mo|\i OF SIGNAL on IMAGE

BELIEVED TO BE SUSPECT
(ONLY IF ENTIRE SIGNAL OR IMAGE IS NOT SUSPECT)
i2

222 I222 2
VISUALLY RESCALE AND REGISTER THE CUT-OUT
SUSPECT SIGNAL TO THE CUT-OUT ORIGINAL SIGNAL
2 2 2 2 2 T 2 2

2 2 , 2 2 22 2 2 2 2 2 1 2 2 APPLY x OFFSET, Y OFFSET, AND SCALE TO our-om SUSPECT, THEN FIESAMPLE omo EXACT emu AND cur-our _ 2 QF ORIGINAL SIGNAL 2

I 22 2 -2 22
RUN THROUGH SEARCH PROGRAM WITH MEAN
SOUARED ERROR AS CRITERIA AND DC OFFSET, GAIN, AND
GAMMA AS THE THREE VARIABLES; APPLY TO SUSPECT

I22 2
SUBTRACT ORIGINAL FROM suspect
7 GIVING DIFFERENCE SIG_N_AL on IMAGE

2 22 2 2 2 22 I I
STEP THROUGH ALL N RANDOM INDEPENDENT SIGNALS, MASKED
AS ORIGINAL AND CROSS-CORRELATED WITH DIFFERENCE SIGNAL
IN IMMEDIATE NEIGHBORHOOD OF REGISTRATION POINTS

2 2 Q 21 I '85 TE 2 IPIND 0 AND 1 1.9/51. av A\JERA@II\I*G FIRST FOUR 0101 com: VALUES] ASTSIGN EITHETRTATO OB A 1 TO PEATCH CHOSSP-CORRELATION FIESULT DEPENDINGQAI gijqxuvury fro THE Avi=.RAegs_9F PREVIOUS STEP

LCI-IEC_K_F1ES_UI_'[, AGAINST sscunso IDENTIFICATION NUMBER]
2 12 2 7
PROSECUTEIF IT MATCHES? on AT LEAST SEND
A NASTY I_E]‘TER DEMANDINGORECOMPENSE