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author = "Megías Jiménez, David"
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Found 18 documents, displaying page 1 of 2

Robustness aspects of Model Predictive Control

Author(s) : Megías Jiménez, David
Description : Model, Model-based or Receding-horizon Predictive Control (MPC or RHPC) is a successful and mature control strategy which has gained the widespread acceptance of both academia and industry. The basis of these control laws, which have been reported to handle quite complex dynamics, is to perform pred...
Repository : Universitat Autònoma de Barcelona: Tesis Doctorals en Xarxa (TDX)
Language(s) : English

High capacity FFT-based audio watermarking

Author(s) : Fallahpour, Mehdi , Megías Jiménez, David
Description : Peer-reviewed , This paper proposes a novel high capacity audio watermarking algorithm to embed data and extract it in a bit-exact manner based on changing the magnitudes of the FFT spectrum. The key idea is to divide the FFT spectrum into short frames and change the magnitude value of the FFT samples ...
Repository : Repositori institucional de la UOC, O2
Language(s) : Old English

High capacity audio watermarking using the high frequency band of the wavelet domain

Author(s) : Fallahpour, Mehdi , Megías Jiménez, David
Description : This paper proposes a novel high capacity robust audio watermarking algorithm by using the high frequency band of the wavelet decomposition at which the human auditory system (HAS) is not very sensitive to alteration. The main idea is to divide the high frequency band into frames and, for embedding,...
Repository : Repositori institucional de la UOC, O2
Language(s) : Old English

A novel semi-fragile forensic watermarking scheme for remote sensing images

Author(s) : Serra Ruiz, Jordi , Megías Jiménez, David
Description : Peer-reviewed , A semi-fragile watermarking scheme for multiple band images is presented. We propose to embed a mark into remote sensing images applying a tree structured vector quantization approach to the pixel signatures, instead of processing each band separately. The signature of themmultispectral...
Repository : Repositori institucional de la UOC, O2
Language(s) : Old English

Steganalytic Methods for the Detection of Histogram Shifting Data Hiding Schemes

Author(s) : Lerch Hostalot, Daniel , Megías Jiménez, David
Description : Peer-reviewed , In this paper, several steganalytic techniques designed to detect the existence of hidden messages using histogram shifting schemes are presented. Firstly, three techniques to identify specific histogram shifting data hiding schemes, based on detectable visible alterations on the histog...
Repository : Repositori institucional de la UOC, O2
Language(s) : Old English

Fingerprinting automático de contenidos digitales inspirado en las secuencias de ADN

Author(s) : Megías Jiménez, David , Domingo Ferrer, Josep
Description : Peer-reviewed , La distribución multicast de contenidos no es adecuada para el comercio electrónico, dado que produce exactamente la misma copia del contenido, de manera que los culpables de una distribución ilegal no pueden ser identificados. Por otro lado, la distribución unicast requiere una conexió...
Repository : Repositori institucional de la UOC, O2
Language(s) : Spanish

Subjectively adapted high capacity lossless image data hiding based on prediction errors

Author(s) : Fallahpour, Mehdi , Megías Jiménez, David , Ghanbari, Mohammed
Description : This article reports on a lossless data hiding scheme for digital images where the data hiding capacity is either determined by minimum acceptable subjective quality or by the demanded capacity. In the proposed method data is hidden within the image prediction errors, where the most well-known predi...
Repository : Repositori institucional de la UOC, O2
Language(s) : Old English

Reversible and high capacity data hiding in medical images

Author(s) : Fallahpour, Mehdi , Megías Jiménez, David , Ghanbari, Mohammed
Description : In this paper we introduce a highly efficient reversible data hiding system. It is based on dividing the image into tiles and shifting the histograms of each image tile between its minimum and maximum frequency. Data are then inserted at the pixel level with the largest frequency to maximize data hi...
Repository : Repositori institucional de la UOC, O2
Language(s) : Old English

Robust watermarking scheme based on the JPEG2000 standard

Author(s) : Minguillón Alfonso, Julià , Herrera Joancomartí, Jordi , Megías Jiménez, David
Description : Peer reviewed
Repository : Repositori institucional de la UOC, O2
Language(s) : English

Improved flooding of broadcast messages using extended multipoint relaying

Author(s) : Montolio Aranda, Pere , García Alfaro, Joaquín , Megías Jiménez, David
Description : A common operation in wireless ad hoc networks is the flooding of broadcast messages to establish network topologies and routing tables. The flooding of broadcast messages is, however, a resource consuming process. It might require the retransmission of messages by most network nodes. It is, therefo...
Repository : Repositori institucional de la UOC, O2
Language(s) : Old English
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Found 18 documents, displaying page 1 of 2