Search Results - "Astola, J."

A spatially adaptive nonparametric regression image deblurring by Katkovnik, V., Egiazarian, K., Astola, J.

“…We propose a novel nonparametric regression method for deblurring noisy images. The method is based on the local polynomial approximation (LPA) of the image…”
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Phase Local Approximation (PhaseLa) Technique for Phase Unwrap From Noisy Data by Katkovnik, V., Astola, J., Egiazarian, K.

“…The local polynomial approximation (LPA) is a nonparametric regression technique with pointwise estimation in a sliding window. We apply the LPA of the…”
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Analysis of the meter of acoustic musical signals by Klapuri, A.P., Eronen, A.J., Astola, J.T.

“…A method is described which analyzes the basic pattern of beats in a piece of music, the musical meter. The analysis is performed jointly at three different…”
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Vector median filters by Astola, J., Haavisto, P., Neuvo, Y.

“…Two nonlinear algorithms for processing vector-valued signals are introduced. The algorithms, called vector median operations, are derived from two…”
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Assessment of the corrosion resistance of self-ordered anodic aluminum oxide (AAO) obtained in tartaric-sulfuric acid (TSA) by González-Rovira, Leandro, González-Souto, Lorena, Astola, Pedro J., Bravo-Benítez, Cristina, Botana, Francisco Javier

“…The corrosion performance of self-ordered porous anodic aluminum oxide (AAO) has been studied and correlated to its structure. High purity aluminum alloy…”
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Adaptive Coding and Prediction of Sources With Large and Infinite Alphabets by Ryabko, B.Y., Astola, J., Gammerman, A.

“…The problem of predicting a sequence x 1 ,x 2 ,. . . generated by a discrete source with unknown statistics is considered. Each letter x t+1 is predicted using…”
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High-Quality DCT-Based Image Compression Using Partition Schemes by Ponomarenko, N.N., Egiazarian, K.O., Lukin, V.V., Astola, J.T.

“…This letter presents an advanced discrete cosine transform (DCT)-based image compression method that combines advantages of several approaches. First, an image…”
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Optimal weighted median filtering under structural constraints by Ruikang Yang, Lin Yin, Gabbouj, M., Astola, J., Neuvo, Y.

“…A new expression for the output moments of weighted median filtered data is derived. The noise attenuation capability of a weighted median filter can now be…”
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Analysis of the properties of median and weighted median filters using threshold logic and stack filter representation by Yli-Harja, O., Astola, J., Neuvo, Y.

“…The deterministic properties of weighted median (WM) filters are analyzed. Threshold decomposition and the stacking property together establish a unique…”
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Nonlinear modeling of protein expressions in protein arrays by Tabus, I., Hategan, A., Mircean, C., Rissanen, J., Shmulevich, I., Wei Zhang, Astola, J.

“…This paper addresses the problem of estimating the expressions or concentrations of proteins from measurements obtained from protein arrays and illustrates the…”
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Using local median as the location of the prior distribution in iterative emission tomography image reconstruction by Alenius, S., Ruotsalainen, U., Astola, J.

“…Iterative reconstruction algorithms like MLEM (Maximum Likelihood Expectation Maximization) can be regularized using a weighted roughness penalty term…”
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An optimal nonlinear extension of linear filters based on distributed arithmetic by Akopian, D., Astola, J.

“…Distributed arithmetic (DA)-based implementation of linear filters relies on the linear nature of this operation and has been suggested as a multiplication…”
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Jointly analyzing gene expression and copy number data in breast cancer using data reduction models by Berger, J.A., Hautaniemi, S., Mitra, S.K., Astola, J.

“…With the growing surge of biological measurements, the problem of integrating and analyzing different types of genomic measurements has become an immediate…”
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Multistage interconnection networks for parallel Viterbi decoders by Akopian, D., Takala, J., Saarinen, J., Astola, J.

“…We propose new multistage interconnection networks (MIN) for scalable parallel Viterbi decoder architectures. The architecture consists of the desired number…”
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Constant geometry algorithm for discrete cosine transform by Takala, J., Akopian, D., Astola, J., Saarinen, J.

“…Modification to the architecture-oriented fast algorithm for discrete cosine transform of type II from Astola and Akopian (see ibid., vol.47, no.4, p.1109-24,…”
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A note on argument principle by Rusu, C., Astola, J.

“…The goal of this work is to show how the argument principle together with discrete Fourier transform (DFT) can be used to determine some properties of…”
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Architecture-oriented regular algorithms for discrete sine and cosine transforms by Astola, J., Akopian, D.

“…We propose fast algorithms for a class of trigonometric transforms. These algorithms have a unified structure and simple data exchange similar to the constant…”
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Roundoff errors in block-floating-point systems by Kalliojarvi, K., Astola, J.

“…Block-floating-point representation is a special case of floating-point representation, where several numbers have a joint exponent term. In this paper,…”
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Teager energy and the ambiguity function by Hamila, R., Astola, J., Alaya Cheikh, F., Gabbouj, M., Renfors, M.

“…The connection between the Teager energy operator and the ambiguity function is established in this correspondence after defining the Teager operator over…”
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Nonlinear multivariate image filtering techniques by Kaijun Tang, Astola, J., Neuvo, Y.

“…In this paper, nonlinear multivariate image filtering techniques are proposed to handle color images corrupted by noise. First, we briefly review the principle…”
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