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WMicaD: A New DigitalWatermarking
Technique Using Independent
Component Analysis
出處：Thang Viet Nguyen, Jagdish Chandra Patra, and Pramod Kumar
Meher
School of Computer Engineering, Nanyang Technological University, 50 Nanyang Avenue,
Singapore 639798
Correspondence should be addressed to Jagdish Chandra Patra, [email protected]
Received 24 July 2006; Revised 22 February 2007; Accepted 15 August 2007
報告者：向峻霈
Outline
Introduction
 WMicaD embedding scheme
 Performance results
 WMicaD for detection of tampered area
 Recovering the signatures
 Discussion and conclusion

Introduction

Digital watermarking, in which some information
called the watermark is embedded directly and
imperceptibly into original data

the watermark is bound to the work and should
be extractable to prove the ownership

watermark also contains the tracking
information about the copies of the work
Introduction

WMicaD (watermarking by independent
component analysis with dual watermark)
◦ Dual watermark embedding scheme
◦ ICA-based extraction
Introduction

watermark extraction is carried out on sizereduced images

Key image < original image

Computation
The downsizing and upsizing
operators
WMicaD embedding scheme
WMicaD embedding scheme
S1
W1
original image I
I+
S2
W2
WMicaD embedding scheme
TheWMicaD extraction scheme
The configuration table for
the two experiments
Performance results
Performance results
WMicaD for detection of tampered
area
Recovering the signatures
Discussion and conclusion

WMicaD extraction is not considered as
a totally blind watermarking extraction

it is almost mpossible for the attackers to
know these parameters.