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- Petr Lobaz
- Optics express
- 2011

The article deals with a method of calculation of off-axis light propagation between parallel planes using discretization of the Rayleigh-Sommerfeld integral and its implementation by fast convolution. It analyses zero-padding in case of different plane sizes. In case of memory restrictions, it suggests splitting the calculation into tiles and shows that… (More)

- Norbert Leister, Masahiro Yamaguchi, +7 authors P Lobaz
- 2012

Light propagation in a free space is a common computational task in many computer generated holography algorithms. A solution based on the angular spectrum decomposition is used frequently. However, its correct off-axis numerical implementation is not straightforward. It is shown that for long distance propagation it is necessary to use digital low-pass… (More)

- Petr Lobaz
- Optics express
- 2013

In computational Fourier optics, computer generated holography, etc., coherent light propagation calculation between parallel planes is the essential task. A proper calculation discretization in the off-axis case leads to big memory demands in order to avoid aliasing errors. The proposed method typically cuts down the memory demands one hundred times. The… (More)

- Technická zpráva, Petr Lobaz
- 2012

This technical report describes how to calculate coherent light propagation in a free space between parallel planes. The method descibed is based on the RayleighSommerfeld integral of the first kind and it serves as a reference method for evaluation of other, faster methods. The method presented solves the problem of signal aliasing by upsampling, filtering… (More)

- Petr Lobaz, Petr Vaněček
- Optics express
- 2015

Calculations of free space light propagation, such as those used in digital holography, deal with distances much longer than a wavelength. Computer representation of real numbers must therefore provide enough precision to handle this situation. We show that single precision must be used with the utmost care, which is especially important in GPU… (More)

- P. Lobaz, Libor Vása
- Graphical Models
- 2014

In this paper, we present an algorithm for efficient encoding of triangle meshes. The algorithm preserves the local relations between vertices by encoding their Laplacian coordinates, while at the same time, it uses a hierarchy of additional vertex constraints that provides global rigidity and low absolute error, even for large meshes. Our scheme… (More)

- Petr Lobaz
- 1999

In computer applications, work with terrains is very often needed. Requirements on data structure of the terrain model depend on the application. Here we present data structure destined mainly for image synthesis software. Presented data structure is able to store complex terrain features such as overhangs and caves. Notes about implementation are also… (More)

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