How to Achieve Robustness & Fragility in Watermarking Technology

CPTWG MarkAny Watermarking Technology 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

CPTWG MarkAny Watermarking Technology 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…

CPTWG MarkAny Watermarking Technology Robustness: Properties Imperceptibility Audibility, Visibility Resistance to Data Manipulations Audio, Image Trade-off: between Imperceptibility and Resistance

CPTWG MarkAny Watermarking Technology Imperceptibility Human Perception Model Psycho-Acoustic Model Psycho-Visual Model

CPTWG MarkAny Watermarking Technology Imperceptibility Bit Error Rate False Positive Rate

CPTWG MarkAny Watermarking Technology 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

CPTWG MarkAny Watermarking Technology Data Manipulations(Audio) Linear filtering Time-Scaling, Pitch-scaling Non-linear filtering Lossy Compressions Data Reduction Transcoding D/A, A/D conversion Multiple Watermarking

CPTWG MarkAny Watermarking Technology Enhancement of Resistance Redundancy Spread-spectrum Method (DCT, Mellin-Fourier Transform, DWT) Split in perceptual bands Phase Spectrum Embedding Magnitude Spectrum Embedding

CPTWG MarkAny Watermarking Technology Fragility Two type of watermark Robust watermark Fragile watermark Detection of modification, compression, and other attack of original contents Least significant bit change Weak magnitude embedding

CPTWG MarkAny Watermarking Technology 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

CPTWG MarkAny Watermarking Technology MarkAny watermarking Embedding Extracting

CPTWG MarkAny Watermarking Technology MarkAny watermarking Original Image Watermark Logo Watermarked Image Extracted Watermark Logo

CPTWG MarkAny Watermarking Technology 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%

CPTWG MarkAny Watermarking Technology PD structure of MarkAny Display Control CPU Board TI320 VC5410 DSP Board I/FL HPI Parallel port *HPI : Host Port Interface *I/FL : Interface Logic Sound I/F Amplifier DVD or CD

CPTWG MarkAny Watermarking Technology PD GUI for SDMI

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