[Adapt] Seminar presentation abstract

[姜凯]

Dear all,
I will give a talk at the seminar tomorrow about the paper I published
before. Hope you enjoy it. Here is the abstract.

Past research on watermarking digital road maps has been focused
on deterring common attacks such as adding noise to the whole
map so as to destroy the embedded watermarks. This paper fo-
cuses on two less common but increasingly used types of attack:
crop attacks and merge attacks. Crop attack crops a fragment of
the original map and uses the fragment as a new map. When the
new map is much smaller than the original map, it is called massive
cropping. Merge attack merges maps from various sources together
to form a new map. Conventional watermarking techniques fail
against these attacks either because they require global information
from the whole map or they must add too many local watermarks
and affect the usability of the maps. This paper proposes a novel
quad-tree based blind watermarking scheme that partitions the orig-
inal map according to the quad-tree and plants just one single bit in
each sub-region of the map. The approach achieves almost 100%
detection accuracy for moderate crop and merge attacks, and over
80% accuracy with more than 95% of the original map cropped and
removed. Furthermore, the method introduces very little distortion
to the original map: to effectively protect a 23.5MB Minneapolis-
St.Paul map against crop and merge as well as other common at-
tacks, only 423 bits or 53 bytes of watermark is required.


Cheer up
Jacky Jiang* *(*姜凯*)
Graduate
Shanghai Jiao Tong University
Department of Computer Science and Engineering
No.800 Dongchuan Road,Shanghai,P.R.China
Tel:15000677334
Email:jkai421 at gmail.com
<http://Email:jkai421@gmail.com/jkai@sjtu.edu.cn>(urgent
and significant)
jkai at sjtu.edu.cn <http://Email:jkai421@gmail.com/jkai@sjtu.edu.cn>(normal)
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