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Open AccessArticle

Implementation of a Depth from Light Field Algorithm on FPGA

Departamento de Ingeniería Industrial, Universidad de La Laguna, Apartado 456, 38200 La Laguna, S/C de Tenerife, Spain
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Sensors 2019, 19(16), 3562; https://doi.org/10.3390/s19163562
Received: 4 July 2019 / Revised: 5 August 2019 / Accepted: 9 August 2019 / Published: 15 August 2019
(This article belongs to the Section Physical Sensors)
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Abstract

A light field is a four-dimensional function that grabs the intensity of light rays traversing an empty space at each point. The light field can be captured using devices designed specifically for this purpose and it allows one to extract depth information about the scene. Most light-field algorithms require a huge amount of processing power. Fortunately, in recent years, parallel hardware has evolved and enables such volumes of data to be processed. Field programmable gate arrays are one such option. In this paper, we propose two hardware designs that share a common construction block to compute a disparity map from light-field data. The first design employs serial data input into the hardware, while the second employs view parallel input. These designs focus on performing calculations during data read-in and producing results only a few clock cycles after read-in. Several experiments were conducted. First, the influence of using fixed-point arithmetic on accuracy was tested using synthetic light-field data. Also tests on actual light field data were performed. The performance was compared to that of a CPU, as well as an embedded processor. Our designs showed similar performance to the former and outperformed the latter. For further comparison, we also discuss the performance difference between our designs and other designs described in the literature. View Full-Text
Keywords: light field; disparity estimation; FPGA light field; disparity estimation; FPGA
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Domínguez Conde, C.; Lüke, J.P.; Rosa González, F. Implementation of a Depth from Light Field Algorithm on FPGA. Sensors 2019, 19, 3562.

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