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- Orlando JosÃ© Tobias, Rui Seara
- IEEE Trans. Image Processing
- 2002

Methods for histogram thresholding based on the minimization of a threshold-dependent criterion function might not work well for images having multimodal histograms. We propose an approach toâ€¦ (More)

- Francisco das Chagas de Souza, Orlando JosÃ© Tobias, Rui Seara, Dennis R. Morgan
- IEEE Transactions on Signal Processing
- 2010

This paper presents a proportionate normalized least-mean-square (PNLMS) algorithm using individual activation factors for each adaptive filter coefficient, instead of a global activation factor asâ€¦ (More)

This paper presents a stochastic analysis of the Filtered-X LMS algorithm. The mean weight vector recursion is derived for slow adaptation and for a white reference signal without use of independenceâ€¦ (More)

- E.M. Lobato, O. J. Tobias, Rui Seara
- 2006 International Telecommunications Symposium
- 2006

This paper presents a stochastic analysis of the transform-domain epsiv least-mean-square (TDepsivLMS) algorithm. The TDLMS algorithm is used as an alternative to the ordinary LMS algorithm toâ€¦ (More)

- Francisco das Chagas de Souza, Orlando JosÃ© Tobias, Rui Seara, Dennis R. Morgan
- 2009 17th European Signal Processing Conference
- 2009

This paper presents a proportionate normalized least-mean-square (PNLMS) algorithm using an individual activation factor for each adaptive filter coefficient. Such strategy is used instead of aâ€¦ (More)

- E.L.O. Batista, O. J. Tobias, Rui Seara
- 2006 International Telecommunications Symposium
- 2006

The major drawback for using adaptive Volterra filters in practical applications is the large number of adaptive filter weights required. Many research works can be found in the open literatureâ€¦ (More)

- Elen Macedo Lobato, Orlando JosÃ© Tobias, Rui Seara
- 2006 IEEE International Conference on Acousticsâ€¦
- 2006

This paper proposes a new stochastic model for the normalized LMS (NLMS) algorithm under correlated input data. The proposed model is derived without invoking the simplifying assumption thatâ€¦ (More)

- Eduardo Luiz Ortiz Batista, Orlando JosÃ© Tobias, Rui Seara
- IEEE Transactions on Signal Processing
- 2010

In most practical applications, the major drawback for using adaptive Volterra filters is the large number of coefficients to cope with. Several research works discussing strategies to reduce theâ€¦ (More)

- Javier E. Kolodziej, Orlando JosÃ© Tobias, Rui Seara, Dennis R. Morgan
- IEEE Transactions on Signal Processing
- 2009

This paper discusses the constrained stochastic gradient (CSG) algorithm used for controlling antenna arrays, aiming to maximize the signal-to-interference-plus-noise ratio (SINR) in mobileâ€¦ (More)

- Francisco das Chagas de Souza, Rui Seara, Dennis R. Morgan
- IEEE Transactions on Signal Processing
- 2012

This correspondence presents an individual-activation-factor proportionate normalized least-mean-square (IAF-PNLMS) algorithm that (during the adaptive process) uses a new gain distribution strategyâ€¦ (More)