Scalable Video Watermarking. Peter Meerwald June 25, 2007
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1 Scalable Video Watermarking Peter Meerwald June 25, 2007
2 Watermarking Watermarking is imperceptible embedding of information into multimedia data [Cox02a] Applications: copyright protection, data authentication, fingerprinting, Video pecularities: Need perceptual model for temporal dimension [Watson, Koz05a] Highly correlated data gives rise to collusion attack [Su05a, Doerr05b] Data volume favors compressed-domain embedding, real-time processing
3 Scalable Video Capability to adapt video bitstream to presentation device or transmission conditions SNR or quality scalability Resolution scalability, eg. CIF QCIF Spatial scalability Temporal scalability, eg frames/s Frame 0, QCIF Frame 2, QCIF Frame 0, CIF Frame 1, CIF Frame 2, CIF Frame 3, CIF
4 Scalabe Video Codecs H.264 SVC extension based on hybrid H.264/AVC codec [Schwarz06a] Resolution layers, quantization refinement (FGS) GOP structure MC-EZBC builds on motion-compensated temporal filtering (MCTF) followed by spatial subband decomposition [Ohm05a] Embedded bitstream
5 Scalable Video Watermarking Communication channel, detection or decoding problem Transmission properties Watermark Embedder Host Video Receiver Target Video Message Message Coding Transmission Distortion Watermark Decoder Message Key Scalable Video Coding Key Host Modificaton Bitsteam Formation Video Decoder Processing / Attack Distortion Bitstream Extraction Scalability Control Scalable Coding Knowledge
6 Scalable Watermark Properties [Piper05a] Detectability: Watermark is detectable in any portions of the scaled content which is of 'acceptable' quality. Graceful Improvement: Increased portions of the scaled content provide reduced error in watermark detection.
7 A Simple Watermarking Scheme (1) Pseudo-random, bipolar sequence (same key for all frames) w i {1,1} 3-level spatial DWT decomposition Embedding: Perceptually shaped (Watson) embedding in detail subbands v i =v i s i w i Detection: whitening filter (3x3, high-pass), correlation per decomposition level c l = v w v w c=max l c l
8 A Simple Watermarking Scheme (2) Spatial domain difference image Watermarked Foreman sequence CIF (352x288, 4:2:0) PSNR ~35.5 db Scheme is called 'DWT' DFT domain difference image
9 Scalability Distortion On Watermark Quantization Block Replacement Attack due to motion-compensation (?) SNR Resolution Downsampling, synchronization problem Reduced data rate Resynchronization, depending on key-schedule Reduced data rate Temporal
10 Experiment Embed DWT watermark in first 8 frames of Foreman, PSNR ~35 db Form scalable bitstream H.264/SVC: GOP size 8, 2 resolution layers (QCIF, CIF), 3 FGS layers, QP 40 MC-EZBC: 4 level decomposition Extract bitstream: BitStreamExtract <fname> -e <res.>@<frate>:<brate> (SVC) pull <fname> -s <res. layer> -r <brate> (MC-EZBC) Decode bitstream & detect watermark
11 1 0.8 SNR Scalability MC-EZBC R/D H.264 SVC R/D Correlation (MZ-EZBC) Correlation (SVC) Correlation Strength PSNR (db) Threshold frame average, Foreman sequence (CIF) Rate (kbit/s)
12 Resolution Scalability Correlation CIF (MZ-EZBC) Correlation QCIF (MZ-EZBC) Correlation CIF (SVC) Correlation QCIF (SVC) 0.4 Correlation Threshold frame average, Foreman sequence 2000 Rate (kbit/s)
13 Further Investigations Implement collusion attacks (TFA, etc.) Motion compensation as Block Replacement Attack (BRA) (?) Temporal scalability vs. synchronization with key-schedule Try quantization-based schemes (QIM, ST-SCS, TCQ) Consider authentication application & compressed-domain embedding Use temporal transform: 3D-DCT, 3D-DFT, DFT-2D-DCT, t+2d DWT Exploit temporal masking, motion-coherent watermarking Employ ROC, BER measure instead of correlation
14 References Cox02a, Digital watermarking, Morgan Kaufman, Su05a, Statistical invisibility for collusion-resistant digital video watermarking, IEEE Tr. MM, 7(1):43-51, Koz05a, Oblivious video watermarking using temporal sensitivity of HVS, , ICIP '05. Schwarz06a, Overview of the scalable H.264/MPEG4-AVC extension, ICIP '06. Ohm05a, Advances in scalable video coding, Proc. IEEE, 93(1):42-56, Piper05a, Resolution and quality scalable spread spectrum image watermarking, 79-89, MM-SEC '05. Doerr05b, Security issue and collusion attacks in video watermarking, PhD thesis, Univ. of Nice at Sophia-Antipolis, France
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