semi video2

8/18/2019 Semi Video2

1/16

Presented by:-

K.Nihal Reddy(070)

G.Shiva Kumar(082) T.Nishanth(106)

Guided by:-

Pr!. K."sha

#$%&' T&R*RK$NG


2/16

CONTENTS Introduction Types of watermarking Desired properties Need for video watermarking A generic approach to watermarking digital data Structure of a Typical Video Watermarking System An algorithm of video watermarking

Attack on watermark Applications of watermarking Conclusion eferences


3/16

INTRODUCTION

Definition! A digital watermark is a digital signal orpattern inserted into a digital document such aste"t# graphics or multimedia# and carries

information uni$ue to the copyright owner%

Video watermarking is an e"tension of thisconcept%

$ma+e #ide udi


4/16

Types of Video Watermarking

&%Visi'le watermarking

it’s use : -1. To discourage unauthorized usage.

2. s an ad!ertise"ent

#isi$%e &ater"ar' is a trans%ucent o!er%aid intoan i"age and is !isi$%e to the !ie&er. #isi$%e

&ater"ar'ing is used to indicate o&nershi( and)or co(*right (rotection.

'ri+inal atermar,ed

NSN

+ater"ar'


5/16

2.In!isi$%e &ater"ar's

• In!isi$%e &ater"ar' is e"$edded into the data insuch a &a* that the changes "ade to the (i,e%!a%ues are (erce(tua%%* not noticed. In!isi$%e

&ater"ar' is used as e!idence o) o&nershi( andto detect "isa((ro(riated i"ages.

• Its "ain use is to send secret in)or"ation.

'ri+inal

$ma+e

atermar,ed

$ma+e


6/16

DESIRED ROERTIES o'ust

Video watermarking ( frame averaging# framedropping# frame swapping%%% )

ecovera'le from a document emova'le 'y authori*ed users +ow error pro'a'ility ,rovide the original information em'edded

relia'ly Capacity Invisi'le


7/16

Need )or !ideo &ater"ar'ing

,rotect copyright of a data% Video Watermarking can help

• ,rove ownership• Identify a misappropriating person

• Trace the video dissemination -roadcast .onitoring

Video watermarking introduces some issues notpresent in image watermarking

/rame averaging# frame dropping# frameswapping …


8/16

eneric a((roach to &ater"ar'ingdigita% data

There are 0 main processes involved inwatermarking 1

&% Insertion of a watermark

2% Detection of a watermark

0% emoval of a watermark


9/16

watermark insertion unit

The user key # input video and the watermarkare passed through a watermark insertion unit%

This results in a watermarked video%


10/16

Watermark 3"traction 4nit Two phases!5

&% +ocating the watermark

2% ecovering the watermark information%


11/16

+ater"ar' Detection Unit Consists of !5

An e"traction unit to first e"tract the watermark%

Compare it with the original watermark inserted%

The output is 6es or No depending on whether the watermark is present%


12/16

-'/RT


13/16

%gorith" )or +ater"ar' E"$edding

using /S0 Techniueirst the !ideo is di!ided in nu"$er o) )ra"es using 3T/0

)unction in $"( 4%e )or"at5$"( 4%e )or"at is unco"(ressed4%e )or"at 6 this )or"at restores the $inar* data in "uchsa)e &a*7.

Then the nu"$er &hich &e need to encr*(t 5as a 'e*7 is

con!erted in $inar* )or".

This 'e* nu"$er is then (%aced in "essage at /S0 (osition.

Then )or each )ra"e 8"essage is &ater"ar'ed at res(ecti!e

/S0 (osition.t end a%% )ra"es are again co"$ined and !ideo is )or"ed

&ith unco"(ressed 4%e )or"at to restore the data integrit*.

+hi%e e,tracting &e get the e,act "essage i"age and the'e* encr*(ted into the "essage i"age.


14/16

• O&ner Identi4cation

• irac* (re!ention in CDs

• 9idden co""unication

• Transaction Trac'ing

• Content uthentication

•

0roadcast 3onitoring• De!ice Contro%

• uto"atic "onitoring o) co(*righted "ateria% on

the +e$

A,,+ICATI7NS 7/ WAT3.A8IN9


15/16

CONC/USION

Digita% &ater"ar' is an i"(ortant ste( to&ard "anage"ento) co(*righted and secured docu"ents. n* 'ind o) digita%data %i'e !ideo 5consists o) i"age )ra"es78 audio8 te,t caneasi%* &ater"ar'ed.

#isi$%e &ater"ar'ing techniue is used $* the Te%e!isionchanne%s to restrict the i%%ega% trans"ission 6 $roadcasting o) T.#. (rogra"s $* inserting the &ater"ar' at the corner o) thechanne% signa%s.

I%%ega% use o) the &ater"ar'ing techniue can $e done $* the

terrorists or Other (ersons &ho are against the co""unit* $*trans)erring the hiding in)or"ation through &ater"ar's.

0ut there are &ater"ar'ing agents &hich act as a detecti!ethrough the trans"ission 6 rece(tion o) datain)or"ation.

So8 the &ater"ar'ing techniue is !er* "uch (o(u%ar in

these da*s8 on%* thing &e need no& da*s is reco!er* o)Di ita% &ater"ar' i) there is attac' on it.


16/16

semi video2

Documents