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Tight numerical bounds for digital terrain modeling by interpolatory subdivision schemes

Moncayo, M.; Reinoso, J.F.; Amat, S. - In: Mathematics and Computers in Simulation (MATCOM) 81 (2011) 10, pp. 2258-2269

Surface subdivision schemes are used extensively in scientific and practical applications to generate continuous surfaces in an iterative manner, starting from a set of points. The first subdivision step defines the so called control polygon. This initial polygon can be considered as a very...

Persistent link: https://www.econbiz.de/10010869984

Fuzzy and rule-based image convolution

Looney, Carl G. - In: Mathematics and Computers in Simulation (MATCOM) 51 (2000) 3, pp. 209-219

An image can be sharpened by high pass filtering of its discrete Fourier transform or by an equivalent convolution … taken here to sharpening and edge detection, as well as smoothing and other processing is to use a ‘smart’ convolution mask … that makes rule-based decisions. Upon employing gains in the rule consequents, we achieve a type of fuzzy convolution of …

Persistent link: https://www.econbiz.de/10010870449

Sum-discrepancy test on pseudorandom number generators

Matsumoto, Makoto; Nishimura, Takuji - In: Mathematics and Computers in Simulation (MATCOM) 62 (2003) 3, pp. 431-442

We introduce a non-empirical test on pseudorandom number generators (prng), named sum-discrepancy test. We compute the distribution of the sum of consecutive m outputs of a prng to be tested, under the assumption that the initial state is uniformly randomly chosen. We measure its discrepancy...

Persistent link: https://www.econbiz.de/10010749671

Spectral regularization method for the time fractional inverse advection–dispersion equation

Zheng, G.H.; Wei, T. - In: Mathematics and Computers in Simulation (MATCOM) 81 (2010) 1, pp. 37-51

In this paper, we consider the time fractional inverse advection–dispersion problem (TFIADP) in a quarter plane. The solute concentration and dispersion flux are sought from a measured concentration history at a fixed location inside the body. Such problem is obtained from the classical...

Persistent link: https://www.econbiz.de/10011050180