Detecting Traces of Affine Transformation

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Detecting Traces of Affine Transformation

Popis výsledku v původním jazyce

In this work we analyze and analytically describe the specific statistical changes brought into the covariance structure of signal by the interpolation process. We show that interpolated signals and their derivatives contain specific detectable periodicproperties. Based on this, we propose a blind, efficient and automatic method capable to find traces of resampling and interpolation. The proposed method can be very useful in many areas, especially in image security and authentication. For instance, when two or more images are spliced together, to create high quality and consistent image forgeries, almost always geometric transformations such as scaling, rotation or skewing are needed. These procedures, typically, are based on a resampling and interpolation step. By having a capable method of detecting the traces of resampling, we can significantly reduce the successful usage of such forgeries.

Název v anglickém jazyce

Detecting Traces of Affine Transformation

Popis výsledku anglicky

In this work we analyze and analytically describe the specific statistical changes brought into the covariance structure of signal by the interpolation process. We show that interpolated signals and their derivatives contain specific detectable periodicproperties. Based on this, we propose a blind, efficient and automatic method capable to find traces of resampling and interpolation. The proposed method can be very useful in many areas, especially in image security and authentication. For instance, when two or more images are spliced together, to create high quality and consistent image forgeries, almost always geometric transformations such as scaling, rotation or skewing are needed. These procedures, typically, are based on a resampling and interpolation step. By having a capable method of detecting the traces of resampling, we can significantly reduce the successful usage of such forgeries.

Druh

D - Stať ve sborníku

CEP obor

BA - Obecná matematika

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2007

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Doktorandské dny 2007

ISBN

978-80-01-03913-7

ISSN

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e-ISSN

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Počet stran výsledku

10

Strana od-do

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Název nakladatele

Česká technika - nakladatelství ČVUT

Místo vydání

Praha

Místo konání akce

Praha

Datum konání akce

16. 11. 2007

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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