AU2001275712A1 - Stegotext encoder and decoder - Google Patents

Stegotext encoder and decoder

Info

Publication number
AU2001275712A1
AU2001275712A1 AU2001275712A AU7571201A AU2001275712A1 AU 2001275712 A1 AU2001275712 A1 AU 2001275712A1 AU 2001275712 A AU2001275712 A AU 2001275712A AU 7571201 A AU7571201 A AU 7571201A AU 2001275712 A1 AU2001275712 A1 AU 2001275712A1
Authority
AU
Australia
Prior art keywords
stegotext
covertext
domain
log
power spectrogram
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
AU2001275712A
Inventor
Stephen John Barlow
Simon Paul Long
Mark St. John Owen
Roger Fane Sewell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Activated Content Corp
Original Assignee
Cambridge Consultants Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB0018489A external-priority patent/GB2365295A/en
Priority claimed from GB0018491A external-priority patent/GB2365296A/en
Priority claimed from GB0018487A external-priority patent/GB2365285A/en
Application filed by Cambridge Consultants Ltd filed Critical Cambridge Consultants Ltd
Publication of AU2001275712A1 publication Critical patent/AU2001275712A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/30—Arrangements for simultaneous broadcast of plural pieces of information by a single channel
    • H04H20/31—Arrangements for simultaneous broadcast of plural pieces of information by a single channel using in-band signals, e.g. subsonic or cue signal
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/0021—Image watermarking
    • G06T1/0028—Adaptive watermarking, e.g. Human Visual System [HVS]-based watermarking
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/0021—Image watermarking
    • G06T1/005—Robust watermarking, e.g. average attack or collusion attack resistant
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/018—Audio watermarking, i.e. embedding inaudible data in the audio signal
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2200/00—Indexing scheme for image data processing or generation, in general
    • G06T2200/28—Indexing scheme for image data processing or generation, in general involving image processing hardware
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2201/00—General purpose image data processing
    • G06T2201/005—Image watermarking
    • G06T2201/0052—Embedding of the watermark in the frequency domain
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2201/00—General purpose image data processing
    • G06T2201/005—Image watermarking
    • G06T2201/0065—Extraction of an embedded watermark; Reliable detection

Abstract

The invention comprises an encoder for encoding a stegotext and a decoder for decoding the encoded stegotext, the stegotext being generated by modulating the log power spectrogram of a covertext signal with at least one key, the or each key having been added or subtracted in the log domain to the covertext power spectrogram in accordance with the data of the watermark code with which the stegotext was generated, and the modulated power spectrogram having been returned into the original domain of the covertext. The decoder carries out Fast Fourier Transformation and rectangular polar conversion of the stegotext signal so as to transform the stegotext signal into the log power spectrogram domain; subtracts in the log power domain positive and negative multiples of the key or keys from blocks of the log power spectrogram and evaluates the probability of the results of such subtractions representing an unmodified block of covertext in accordance with a predetermined statistical model.
AU2001275712A 2000-07-27 2001-07-27 Stegotext encoder and decoder Abandoned AU2001275712A1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
GB0018489A GB2365295A (en) 2000-07-27 2000-07-27 Watermarking key
GB0018491.1 2000-07-27
GB0018489.5 2000-07-27
GB0018491A GB2365296A (en) 2000-07-27 2000-07-27 Encoder/decoder for watermarking a covertext signal
GB0018487.9 2000-07-27
GB0018487A GB2365285A (en) 2000-07-27 2000-07-27 Decoding watermarked data using keys and FFT
PCT/GB2001/003391 WO2002011326A2 (en) 2000-07-27 2001-07-27 Stegotext encoder and decoder

Publications (1)

Publication Number Publication Date
AU2001275712A1 true AU2001275712A1 (en) 2002-02-13

Family

ID=27255820

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2001275712A Abandoned AU2001275712A1 (en) 2000-07-27 2001-07-27 Stegotext encoder and decoder

Country Status (8)

Country Link
US (3) US7298841B2 (en)
EP (1) EP1305901B1 (en)
JP (1) JP5105686B2 (en)
AT (1) ATE293316T1 (en)
AU (1) AU2001275712A1 (en)
CA (1) CA2417499A1 (en)
DE (1) DE60110086T2 (en)
WO (1) WO2002011326A2 (en)

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Also Published As

Publication number Publication date
DE60110086T2 (en) 2006-04-06
US7917766B2 (en) 2011-03-29
US7298841B2 (en) 2007-11-20
US20080152128A1 (en) 2008-06-26
JP2004515799A (en) 2004-05-27
JP5105686B2 (en) 2012-12-26
DE60110086D1 (en) 2005-05-19
US7916862B2 (en) 2011-03-29
US20040028222A1 (en) 2004-02-12
WO2002011326A2 (en) 2002-02-07
EP1305901B1 (en) 2005-04-13
CA2417499A1 (en) 2002-02-07
US20090190755A1 (en) 2009-07-30
WO2002011326A3 (en) 2003-01-23
EP1305901A2 (en) 2003-05-02
ATE293316T1 (en) 2005-04-15

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