Ali N. Akansu

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A class of audio-visual data (fiction entertainment: movies, TV series) is segmented into scenes, which contain dialogs, using a novel hidden Markov model-based (HMM) method. Each shot is classified using both audio track (via classification of speech, silence and music) and visual content (face and location information). The result of this shot-based(More)
In this paper, we present an information-theoretic approach to obtain an estimate of the number of bits that can be hidden in still images, or, the capacity of the data-hiding channel.We show how the addition of the message signal or signature in a suitable transform domain rather than the spatial domain can significantly increase the channel capacity. Most(More)
A generalized parametric PR-QMF design technique based on Bernstein polynomial approximation in the magnitude square domain is developed in this paper. The parametric nature of this solution provides useful insights to the PR-QMF problem. Several well-known orthonormal wavelet filters, PR-QMF's, are shown to be the special cases of the proposed technique.(More)
Although most of its popular applications have been in discrete-time signal processing for over two decades, wavelet transform theory offers a methodology to generate continuoustime compact support orthogonal filter banks through the design of discrete-time finite length filter banks with multiple time and frequency resolutions. In this paper, we first(More)
Mahalingam Ramkumar, Ali N. Akansu and A Ayd n Alatan Department of Ele tri al and Computer Engineering New Jersey Institute of Te hnology New Jersey Center for Multimedia Resear h University Heights, Newark, NJ 07102 ABSTRACT We present a data hiding s heme for still images, in whi h only the magnitude of the DFT oeÆ ients are altered to embed the hidden(More)
A derivative of the Set Partitioning into Hierarchical Trees (SPIHT) image coding method, which generates substreams with different error-resilience properties, is proposed. By dividing the image bit stream into three classes, substreams with different immunity properties are obtained. The unequal protection of these substreams with different channel coding(More)
Several watermarking schemes have been proposed in recent years with proven robustness to many types of intentional and unintentional signal processing attacks. However very few investigators 1], 2] have addressed the question of \unambiguous resolution of ownership with digital watermarks". In this paper we extend the work of Craver et. al. 1]. We show how(More)