Publication: Integridad en imágenes de dispositivos móviles
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2016
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Abstract
El presente trabajo trata de dar respuesta al problema de verificación de manipulación de imágenes digitales obtenidas con los dispositivos móviles. La inmensa cantidad de información digital que nos rodea dificulta enormemente poder verificar su autenticidad. Este problema, unido a la falta de pensamiento crítico, ha provocado que tendamos a aceptar como verdadero todo lo que vemos, sin cuestionar siquiera la legitimidad de dicha información. Lo que permite que uno sea fácilmente manipulable a voluntad de aquellos que buscan mediante dicho engaño obtener un beneficio. Por ello, la principal motivación de este trabajo es tratar de minimizar su impacto, creando una herramienta que realiza un estudio de imágenes digitales que permita obtener un rápido resultado y verifique la autenticidad de esta información. Para ello el sistema propuesto extrae las tablas de cuantificación de las imágenes para posteriormente ser analizadas y dar un veredicto sobre la imagen analizada. Esta herramienta no sólo tiene en cuenta la manipulación de la información almacenada en una imagen obtenida mediante un dispositivo digital, sino también aquella que ha sido manipulada mediante los más conocidos programas de edición de imágenes para ampliar su espectro y conseguir una mejor tasa de detección y una reducción de los falsos positivos, consiguiendo así un método de bajo coste en recursos y tiempo.
The present work tries to give an answer to the recent problem of image verification of manipulated images obtained by mobile devices. We are surrounded by a big extent of digital information, which makes authenticity a great problem. This problem, and the lack of critical thought, made us to accept as true everything we see, without ever questioning the legitimacy of such information. This allows us to be easily manipulated at will, by those who seek to make a profit in that deception. Therefore, the main motivation of this work, is to try to minimize its impact; by creating a tool that performs a study of digital images to obtain a quick result and verify the authenticity of this information. With this focus in mind, the proposed system extracts the quantization tables of images to be analysed subsequently and give a verdict over the analysed image. This tool not only takes into account the manipulation of the information stored in an image obtained by a digital device, but also the one that has been manipulated by the most popular programs of image manipulation to expand its spectrum and get a better detection rate and a reduction in the false positives, achieving a framework with a low-cost of resources and time.
The present work tries to give an answer to the recent problem of image verification of manipulated images obtained by mobile devices. We are surrounded by a big extent of digital information, which makes authenticity a great problem. This problem, and the lack of critical thought, made us to accept as true everything we see, without ever questioning the legitimacy of such information. This allows us to be easily manipulated at will, by those who seek to make a profit in that deception. Therefore, the main motivation of this work, is to try to minimize its impact; by creating a tool that performs a study of digital images to obtain a quick result and verify the authenticity of this information. With this focus in mind, the proposed system extracts the quantization tables of images to be analysed subsequently and give a verdict over the analysed image. This tool not only takes into account the manipulation of the information stored in an image obtained by a digital device, but also the one that has been manipulated by the most popular programs of image manipulation to expand its spectrum and get a better detection rate and a reduction in the false positives, achieving a framework with a low-cost of resources and time.
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Trabajo de Fin de Grado en Ingeniería Informática (Universidad Complutense, Facultad de Informática, curso 2015/2016)