Authors:Tae-Yun Chung; Min-Suk Hong; Young-Nam Oh;

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Presentation transcript:

Digital watermarking for copyright protection of MPEG2 compressed video Authors:Tae-Yun Chung; Min-Suk Hong; Young-Nam Oh; Dong-Ho Shin; Sang-Hui Park Source: IEEE Transactions on Consumer Electronics, Vol. 44, 2-4 June 1998, p. 895 – 901 Date:September 1, 1999 Speaker: Chih-Ping Hsieh

Outline Introduction MPEG2 Picture Types Watermark Embedding Watermark Extraction Experimental Results

Introduction Watermarking scheme for digital video data should include the capability to support following requirements : Difficulty to notice Robustness Extraction with only watermarked video Real-time processing

MPEG2 Picture Types An Intra-coded (I) picture is coded using information only from itself. A Predictive-coded (P) picture is coded using motion compensated prediction from a past I-picture or P-picture. A Bidirectionally predictive-coded (B) picture is coded using motion compensated prediction from a past and/or future I-picture or P-picture.

Watermark Embedding Compressed bitstream Raw video Reconstructed video MPEG2 Encoder MPEG2 Decoder 1 2 3 1 2 Watermark embedding Watermark extraction Watermark embedding and extraction scheme for MPEG2 coding system

Watermark Embedding Block Diagram Original video (I picture) I I’ DCT Q + Embedding mask Block Classification t VLC X α Embedding Strength Buffer DCT w Hiding Information Spreading Modulation Watermarked Compressed bitstream P PN code

Block Classification Masks Vertical edge mask Horizontal edge mask Diagonal edge mask Detailed block mask

Watermark Extraction E DCT IDCT R b Block Classification Demodulation Sum d Decoded Watermarked Video ( I picture ) t p Extracting Mask Bit Criteria PN code Information bit

Experimental Results

Experimental Results