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書報討論 Fall 2004. 蘇柏齊 助理教授. 書報討論概要. 地點 : 視聽教室 (E6-207) 碩一與博一必修 時間 : 每週三下午三時至五時 邀請對象 ( 產官學界 ) 產業界 : 了解實業界運用資訊科技情況 官方 : 資訊產業政策 學界 : 其他學校研究機構之專家研究情形. 書報討論參與. 請大家踴躍參加 專家學者聘請不易 增廣學習領域 與實業界應用發展情形接軌. 演講排程. 09/29 中山科學研究院 系統晶片中心 張誠博士 10/06 IBM Senior Consultant 王鎮志資深顧問 - PowerPoint PPT Presentation
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書報討論Fall 2004
蘇柏齊 助理教授
書報討論概要 地點 : 視聽教室 (E6-207) 碩一與博一必修 時間 : 每週三下午三時至五時 邀請對象 ( 產官學界 )
– 產業界 : 了解實業界運用資訊科技情況– 官方 : 資訊產業政策– 學界 : 其他學校研究機構之專家研究情形
書報討論參與 請大家踴躍參加 專家學者聘請不易 增廣學習領域 與實業界應用發展情形接軌
演講排程 09/29
中山科學研究院 系統晶片中心張誠博士
10/06IBM Senior Consultant 王鎮志資深顧問
10/13宏廣創新動畫公司顧問
演講排程 10/20
中山大學資工系張玉盈教授 10/27
中原大學資管系廖慶榮教授 11/03
微軟技術中心副總經理 Christopher H. Short
工研院 , 資策會 , 國科會專家… 交大 , 成大教授 , 北科大…
My Research Experience and Plan
蘇柏齊 Po-Chyi Su
大綱 自我簡介 資料隱藏的研究 未來研究方向
學歷 學士 (1995)
– 國立台灣大學電機工程學系 碩士、博士 (1998, 2003)
– 美國南加州大學電機工程學系University of Southern CaliforniaDept. of Electrical Engineering – Systems
– 指導教授 : 郭宗杰博士 (Dr. C.-C. Jay Kuo)
– Dissertation: “Information Hiding in Digital Images: Watermarking and Steganography”
經歷 Engineer – ITRI
– Developed DTV software/hardware Research assistant – Univ. of Southern California
– Information hiding & media content protection Engineer – InterVideo Inc.
– Image-processing/text filters of a video editing software Engineer – Media Fair Inc.
– Developed digital watermarking techniques for multimedia content protection
– Assisted in performance evaluation of digital watermarking schemes for DVD
Member of U.S. National Delegates to MPEG-7 International Standard
資料隱藏的研究
Info. Hiding in Digital Images: Watermarking & Steganography Digital Watermarking
– The hidden information is related with the host content
Steganography– The hidden information is unrelated with the host content
Steganography
Watermarking
HiddenInformation
Host Image CompositeImage
- Ownership- User info.- Date/Time- Index
Watermarking and Encryption
Digital Watermarking– A digital watermark is a signal that is embedded in
a digital media – Embedded information and data are inseparable
Encryption– Protect content information during the
transmission of the data– After receipt and subsequent decryption, the data
is no longer protected
Applications of Info. Hiding
Proof of Ownership Copy Protection Fingerprinting Authentication Broadcast Monitoring Covert Communication
Design Issues of Information Hiding
Robustness
Capacity
SecurityComplexity
False Detection
Rate
Unobtrusive
My Dissertation (Part I) Information Hiding in JPEG2000 The earliest work on information-hiding in
JPEG2000 compressed images– Robust digital watermark:
• “An Integrated Approach to Image Watermarking and JPEG-2000 Compression” in Journal of VLSI Signal Processing, 2001
– Steganography for covert communication• “Steganography in JPEG2000 Compressed Images”
accepted by IEEE Trans. on Consumer Electronics Special Issue on JPEG2000: Implementations & Applications
My Dissertation [PART II] Towards Affine-Invariant Digital Image Watermarking Synchronization problem in watermark
detection because of geometrical attacks??
Cropping Rotation/Cropping
Scaling Change ofaspect ratio
Shearing/Cropping
JPEG2000 Watermarking Compression and watermarking share some
characteristics Spread-spectrum watermarking
– Selecting coefficients (quantization indices) by examining bit-planes.
– Correlation detector Features
– Efficiency– Progressive watermarking detection– Region of interest watermarking– False positive detection rate estimation
Invisibility Test
Original Image Marked Image (38.20 dB) Spatial Difference
Original Image Spatial DifferenceMarked Image (38.31 dB)
Invisibility Test (cont.)
Original Image Marked Image (39.16 dB) Spatial Difference
Original Image Marked Image (39.26 dB) Spatial Difference
Invisibility Test (cont.)
Original Image Marked Image (40.65 dB) Spatial Difference
Original Image Marked Image (41.13 dB) Spatial Difference
JPEG2000 Watermarking Robustness against Attacks (1)
Cropping Sharpening Edge EnhancingNo Attack
GIF conversionBlurring Halftoning Noise Adding
JPEG2000 Watermarking Robustness against Attacks (2)
OthersDilation Eroding Mosaic
DCT-based compression
Wavelet-based compression
Hot Wax Coating
HistogramEqualization
ROI Watermarking
Original Imagewith two ROI’s(circular shape)
Decompressed watermarked image with lowbit rate
Spatial Difference
Bitmap Embedding & RetrievalPSNR: 37.02dB
PSNR: 36.94dB
No Attack100%
No Attack100%
JPEG 75%98.07%
JPEG 60%96.99%
JPEG50%93.90%
JPEG 75%98.69%
JPEG 60%97.84%
JPEG 50%95.37%
JPEG2000 Steganography
Covert communication– Transmitting sensitive information– Military usage
Requirements– Transparency– Reliability– Capacity– Security
Steganographic Scheme under the JPEG2000 Framework Reliable & secret transmission Controllable rate-distortion trade-off Progressive transmission
JPEG2K bit-streamof the host image
JPEG2K bit-streamof the hidden image
Grid Signal Embedding/Detection with Autocorrelation
Rotatedwatermarked
image
Scaledwatermarked
image
Unattackedwatermarked
image
Proposed Affine-Invariant Digital Image Watermarking Schemes Spatial-frequency composite watermarking
– “An Image Watermarking Scheme to Resist Generalized Geometrical Transformations” in SPIE Photonics East, Boston, MA, 2000
Affine-invariant Block-based watermarking– “Synchronized Detection of the Block-based
Watermark with Invisible Grid Embedding” in SPIE Photonics West, San Jose, CA, 2001
未來研究方向
Multimedia Security Multimedia Database Multimedia Coding
Multimedia Security
Digital Watermarking– High capacity/Robustness/Security
Digital Rights Management (DRM)– Technology– Legal issues– Business model
Surveillance System– Security– Content authentication– Event notification
Multimedia Database
Video Analysis/Indexing/Skimming/Mining– Apply audiovisual data– More specific types of videos
• Old movie, TV News, Sport…
• Constraints
Multimedia Coding
JPEG2000– Application oriented
• ROI coding
• Volumetric images
H.264/MPEG4 Part10– Simplified implementation– Trade-off between performance & complexity