1. 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

2. Outline Introduction MPEG2 Picture Types Watermark Embedding
Watermark Extraction
Experimental Results

3. 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

4. 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.

5. 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

6. 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

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

10. 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

11. Experimental Results

13. Experimental Results