How to Achieve Robustness & Fragility in Watermarking Technology.

How to Achieve Robustness & Fragility in Watermarking Technology

MarkAny Watermarking TechnologyMarkAny Watermarking TechnologyCPTWGCPTWG

Why watermarking ?

Secure Distribution of Digital Contents Unlimited copy of digital contents without

degradation of the original contents Light-Speed Distribution via internet CD quality compression technology

Contents Protection Authentication Encryption/Decryption, Mobile Agents Watermarking


Watermarking technology

Spatial watermarking Easy embedding/detecting algorithm Weak to general attack

Spread spectrum technique Complex embedding/detecting algorithm Robust to spatial and compression attack Weak to geometric attack : log-polar mapping

method FFT, DCT, Wavelet transform…


Robustness: Properties

Imperceptibility Audibility, Visibility

Resistance to Data Manipulations Audio, Image

Trade-off: between Imperceptibility and Resistance


Imperceptibility

Human Perception Model Psycho-Acoustic Model Psycho-Visual Model


Imperceptibility

Bit Error Rate False Positive Rate


Data Manipulations(Image)

Linear filtering Non-linear filtering Lossy Compressions Data Reduction Local and Global affine transforms Transcoding D/A, A/D conversion Multiple Watermarking


Data Manipulations(Audio)

Linear filtering Time-Scaling, Pitch-scaling Non-linear filtering Lossy Compressions Data Reduction Transcoding D/A, A/D conversion Multiple Watermarking


Enhancement of Resistance

Redundancy Spread-spectrum Method (DCT, Mellin-Fourier Transform, DWT)

Split in perceptual bands Phase Spectrum Embedding Magnitude Spectrum Embedding


Fragility

Two type of watermark Robust watermark Fragile watermark

Fragile watermark Detection of modification, compression,

and other attack of original contents Least significant bit change Weak magnitude embedding


MarkAny watermarking

Key embedding - conventional Watermark exist condition check Copy control information embedding Random number sequence watermark

Logo embedding – MarkAny technique Be able to check copyright information of digital

contents Visible authentication by detecting watermark Robust to compression technique



Embedding

Extracting



Original Image

Watermark Logo

Watermarked Image

Extracted Watermark Logo


Robustness: MarkAny

Three Versions SDMI: June 23 STEP 2000: Aug. 14 Current Version: Sept. 20 (PD Set)

Audibility Test SDMI vs. STEP2000 Reduce WM Strength by 80%


PD structure of MarkAny

DisplayDisplay

ControlCPU

Board

ControlCPU

Board

TI320VC5410

DSPBoard

TI320VC5410

DSPBoard

I/FL

HPI

Parallel

port

*HPI : Host Port Interface*I/FL : Interface Logic

Sound I/F

Amplifier

DVD or CD


PD GUI for SDMI


Have a Nice Day !

Thank You!!

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How to Achieve Robustness & Fragility in Watermarking Technology.

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