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Sensors 2019, 19(3), 568;

A Common Assessment Space for Different Sensor Structures

Department of Technology and Aesthetics, Blekinge Institute of Technology, 37179 Karlskrona, Sweden
Department of Physics, Czech Technical University, 11519 Prague 1, Czech Republic
Authors to whom correspondence should be addressed.
Received: 21 November 2018 / Revised: 21 January 2019 / Accepted: 22 January 2019 / Published: 29 January 2019
(This article belongs to the Section Physical Sensors)
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The study of the evolution process of our visual system indicates the existence of variational spatial arrangement; from densely hexagonal in the fovea to a sparse circular structure in the peripheral retina. Today’s sensor spatial arrangement is inspired by our visual system. However, we have not come further than rigid rectangular and, on a minor scale, hexagonal sensor arrangements. Even in this situation, there is a need for directly assessing differences between the rectangular and hexagonal sensor arrangements, i.e., without the conversion of one arrangement to another. In this paper, we propose a method to create a common space for addressing any spatial arrangements and assessing the differences among them, e.g., between the rectangular and hexagonal. Such a space is created by implementing a continuous extension of discrete Weyl Group orbit function transform which extends a discrete arrangement to a continuous one. The implementation of the space is demonstrated by comparing two types of generated hexagonal images from each rectangular image with two different methods of the half-pixel shifting method and virtual hexagonal method. In the experiment, a group of ten texture images were generated with variational curviness content using ten different Perlin noise patterns, adding to an initial 2D Gaussian distribution pattern image. Then, the common space was obtained from each of the discrete images to assess the differences between the original rectangular image and its corresponding hexagonal image. The results show that the space facilitates a usage friendly tool to address an arrangement and assess the changes between different spatial arrangements by which, in the experiment, the hexagonal images show richer intensity variation, nonlinear behavior, and larger dynamic range in comparison to the rectangular images. View Full-Text
Keywords: software-based; common space; hexagonal image; pixel arrangement; pixel form; continuous extension; resampling software-based; common space; hexagonal image; pixel arrangement; pixel form; continuous extension; resampling

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Wen, W.; Kajínek, O.; Khatibi, S.; Chadzitaskos, G. A Common Assessment Space for Different Sensor Structures. Sensors 2019, 19, 568.

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