Software agents are programs to which one can delegate (aspects of) a task. They differ from ``tr... more Software agents are programs to which one can delegate (aspects of) a task. They differ from ``traditional'' software in that they are personalized, continuously running and semi-autonomous. These qualities make agents useful for a wide variety of information ...
The emergence of audio and video data types in databases will require new information retrieval m... more The emergence of audio and video data types in databases will require new information retrieval methods adapted to the specific characteristics and needs of these data types. An effective and natural way of querying a musical ...
The author presents a simple algebraic method for the extraction of independent components in mul... more The author presents a simple algebraic method for the extraction of independent components in multidimensional data. Since statistical independence is a much stronger property than uncorrelation, it is possible, using higher-order moments, to identify source signatures in array data without any a priori model for propagation or reception, that is, without directional vector parameterization, provided that the emitting sources are independent with different probability distributions. The author proposes such a blind identification procedure. Source signatures are directly identified as covariance eigenvectors after data have been orthonormalized and nonlinearly weighted. Potential applications to array processing are illustrated by a simulation consisting of a simultaneous range-bearing estimation with a passive array
In the last few years, a large number of schemes have been proposed for hiding copyright marks an... more In the last few years, a large number of schemes have been proposed for hiding copyright marks and other information in digital pictures, video, audio and other multimedia objects. We describe some contenders that have appeared in the research literature and in the field; we then present a number of attacks that enable the information hidden by them to be removed or otherwise rendered unusable.
Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears... more Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears on the screen or printed page of such transmission. JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected].
Software agents are programs to which one can delegate (aspects of) a task. They differ from ``tr... more Software agents are programs to which one can delegate (aspects of) a task. They differ from ``traditional'' software in that they are personalized, continuously running and semi-autonomous. These qualities make agents useful for a wide variety of information ...
The emergence of audio and video data types in databases will require new information retrieval m... more The emergence of audio and video data types in databases will require new information retrieval methods adapted to the specific characteristics and needs of these data types. An effective and natural way of querying a musical ...
The author presents a simple algebraic method for the extraction of independent components in mul... more The author presents a simple algebraic method for the extraction of independent components in multidimensional data. Since statistical independence is a much stronger property than uncorrelation, it is possible, using higher-order moments, to identify source signatures in array data without any a priori model for propagation or reception, that is, without directional vector parameterization, provided that the emitting sources are independent with different probability distributions. The author proposes such a blind identification procedure. Source signatures are directly identified as covariance eigenvectors after data have been orthonormalized and nonlinearly weighted. Potential applications to array processing are illustrated by a simulation consisting of a simultaneous range-bearing estimation with a passive array
In the last few years, a large number of schemes have been proposed for hiding copyright marks an... more In the last few years, a large number of schemes have been proposed for hiding copyright marks and other information in digital pictures, video, audio and other multimedia objects. We describe some contenders that have appeared in the research literature and in the field; we then present a number of attacks that enable the information hidden by them to be removed or otherwise rendered unusable.
Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears... more Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears on the screen or printed page of such transmission. JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected].
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