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Description
  • Tento příspěvek se zabývá statistickými změnami přinášenými do signálu interpolačním procesem. Analyticky ukážeme, že interpolované signály, obsahují specifické detekovatelné periodické vlastnosti. Dále představíme efektivní slepou metodu, která dokáže detekovat v digitálním signálu a jeho derivacích stopy po převzorkování a interpolace. Tato metoda muže být velmi užitečná v oblasti ověření pravosti digitálních fotografií. Když jsou ve fotomontáži dva či více snímku nakombinované navzájem, k vytvoření jednoho kvalitního padělku, jsou skoro vždy potřebné geometrické transformace jako je změna rozměru či rotace. Tyto operace jsou obvykle založeny na převzorkování a interpolaci. Proto, nabízená metoda muže být efektivní ve snižování úspešného zneužívání tohoto typu padělku. (cs)
  • 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 periodic properties. 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.
  • 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 periodic properties. 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. (en)
Title
  • Detecting Traces of Affine Transformation
  • Detecting Traces of Affine Transformation (en)
  • Detecting Traces of Affine Transformation (cs)
skos:prefLabel
  • Detecting Traces of Affine Transformation
  • Detecting Traces of Affine Transformation (en)
  • Detecting Traces of Affine Transformation (cs)
skos:notation
  • RIV/68407700:21340/07:04137644!RIV09-MSM-21340___
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • Z(MSM6840770039)
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 416502
http://linked.open...ai/riv/idVysledku
  • RIV/68407700:21340/07:04137644
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • affine transformation; image security (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...ontrolniKodProRIV
  • [F6ABCEDA8F89]
http://linked.open...v/mistoKonaniAkce
  • Praha
http://linked.open...i/riv/mistoVydani
  • Praha
http://linked.open...i/riv/nazevZdroje
  • Doktorandské dny 2007
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...UplatneniVysledku
http://linked.open...iv/tvurceVysledku
  • Mahdian, Mahdian
http://linked.open...vavai/riv/typAkce
http://linked.open.../riv/zahajeniAkce
http://linked.open...n/vavai/riv/zamer
number of pages
http://purl.org/ne...btex#hasPublisher
  • Česká technika - nakladatelství ČVUT
https://schema.org/isbn
  • 978-80-01-03913-7
http://localhost/t...ganizacniJednotka
  • 21340
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