Dr. Roberto Sarmiento Profile

Dr. Roberto Sarmiento

at Univ de Las Palmas de Gran Canaria

SPIE Involvement:

Author

Publications (42)

Proceedings Article | 8 March 2019 Presentation + Paper

Surgical aid visualization system for glioblastoma tumor identification based on deep learning and in-vivo hyperspectral images of human patients

Himar Fabelo , Martin Halicek , Samuel Ortega, Adam Szolna, Jesus Morera, Roberto Sarmiento, Gustavo M. Callico, Baowei Fei

Proceedings Volume 10951, 1095110 (2019) https://doi.org/10.1117/12.2512569

KEYWORDS: Tumors, Visualization, Brain, Tissues, Image classification, In vivo imaging, Neuroimaging, Hyperspectral imaging, Surgery, Cancer

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Proceedings Article | 9 October 2018 Presentation + Paper

A hardware-friendly algorithm for compressing hyperspectral images

Raúl Guerra, María Díaz, Yubal Barrios, Sebastián López, Roberto Sarmiento

Proceedings Volume 10792, 1079208 (2018) https://doi.org/10.1117/12.2500493

KEYWORDS: Image compression, Chromium, Signal to noise ratio, Hyperspectral imaging, Sensors, Image processing, Image quality, Satellites, Real time image processing, Onboard cameras

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Proceedings Article | 5 October 2017 Presentation + Paper

A FPGA implementation for linearly unmixing a hyperspectral image using OpenCL

Raúl Guerra, Sebastián López, Roberto Sarmiento

Proceedings Volume 10430, 104300D (2017) https://doi.org/10.1117/12.2280768

KEYWORDS: Hyperspectral imaging, Field programmable gate arrays, Electromagnetism, Algorithm development, Imaging systems, Visible radiation, RGB color model, Image processing, Detection and tracking algorithms, Active remote sensing

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Proceedings Article | 24 October 2016 Presentation + Paper

A new comparison of hyperspectral anomaly detection algorithms for real-time applications

María Díaz, Sebastián López, Roberto Sarmiento

Proceedings Volume 10007, 100070D (2016) https://doi.org/10.1117/12.2244297

KEYWORDS: Spectral resolution, Detection and tracking algorithms, Image fusion, Sensors, Binary data, Computer simulations, Visualization, Hyperspectral imaging, Imaging systems, Sensor performance

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Due to the high spectral resolution that remotely sensed hyperspectral images provide, there has been an increasing interest in anomaly detection. The aim of anomaly detection is to stand over pixels whose spectral signature differs significantly from the background spectra. Basically, anomaly detectors mark pixels with a certain score, considering as anomalies those whose scores are higher than a threshold. Receiver Operating Characteristic (ROC) curves have been widely used as an assessment measure in order to compare the performance of different algorithms. ROC curves are graphical plots which illustrate the trade- off between false positive and true positive rates. However, they are limited in order to make deep comparisons due to the fact that they discard relevant factors required in real-time applications such as run times, costs of misclassification and the competence to mark anomalies with high scores. This last fact is fundamental in anomaly detection in order to distinguish them easily from the background without any posterior processing.

An extensive set of simulations have been made using different anomaly detection algorithms, comparing their performances and efficiencies using several extra metrics in order to complement ROC curves analysis. Results support our proposal and demonstrate that ROC curves do not provide a good visualization of detection performances for themselves. Moreover, a figure of merit has been proposed in this paper which encompasses in a single global metric all the measures yielded for the proposed additional metrics. Therefore, this figure, named Detection Efficiency (DE), takes into account several crucial types of performance assessment that ROC curves do not consider. Results demonstrate that algorithms with the best detection performances according to ROC curves do not have the highest DE values. Consequently, the recommendation of using extra measures to properly evaluate performances have been supported and justified by the conclusions drawn from the simulations.

Proceedings Article | 24 October 2016 Presentation + Paper

A new hyperspectral image compression paradigm based on fusion

Raúl Guerra, José Melián, Sebastián López, Roberto Sarmiento

Proceedings Volume 10007, 100070F (2016) https://doi.org/10.1117/12.2242891

KEYWORDS: Image fusion, Hyperspectral imaging, Image compression, Image processing, Multispectral imaging, Image restoration, Image resolution, Image sensors, Sensors, Signal to noise ratio

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Proceedings Article | 10 May 2016 Paper

HELICoiD project: a new use of hyperspectral imaging for brain cancer detection in real-time during neurosurgical operations

Himar Fabelo, Samuel Ortega, Silvester Kabwama, Gustavo Callico, Diederik Bulters, Adam Szolna, Juan Pineiro, Roberto Sarmiento

Proceedings Volume 9860, 986002 (2016) https://doi.org/10.1117/12.2223075

KEYWORDS: Hyperspectral imaging, Tissues, Surgery, Brain, Near infrared, Image processing, Cameras, Imaging systems, Image classification, Data modeling

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Proceedings Article | 20 October 2015 Paper

A novel hardware-friendly algorithm for hyperspectral linear unmixing

Raúl Guerra, Lucana Santos, Sebastián López, Roberto Sarmiento

Proceedings Volume 9646, 96460I (2015) https://doi.org/10.1117/12.2196109

KEYWORDS: Hyperspectral imaging, Signal to noise ratio, Image processing, Error analysis, Computer simulations, Hyperspectral simulation, Interference (communication), Detection and tracking algorithms, Calcite, Remote sensing

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Linear unmixing of hyperspectral images has rapidly become one of the most widely utilized tools for analyzing the content of hyperspectral images captured by state-of-the-art remote hyperspectral sensors. The aforementioned unmixing process consists of the following three sequential steps: dimensionality estimation, endmember extraction and abundances computation. Within this procedure, the first two steps are by far the most demanding from a computational point of view, since they involve a large amount of matrix operations. Moreover, the complex nature of these operations seriously difficult the hardware implementation of these two unmixing steps, leading to non-optimized implementations which are not able to satisfy the strict delay requirements imposed by those applications under real-time or near real-time requirements. This paper uncovers a new algorithm which is capable of estimating the number of endmembers and extracting them from a given hyperspectral image with at least the same accuracy than state-of-the-art approaches while demanding a much lower computational effort, with independence of the characteristics of the image under analysis. In particular, the proposed algorithm is based on the concept of orthogonal projections and allows performing the estimation of the number of end- members and their extraction simultaneously, using simple operations, which can be also easily parallelized. In this sense, it is worth to mention that our algorithm does not perform complex matrix operations, such as the inverse of a matrix or the extraction of eigenvalues and eigenvectors, which makes easier its ulterior hardware. The experimental results obtained with synthetic and real hyperspectral images demonstrate that the accuracy obtained with the proposed algorithm when estimating the number of endmembers and extracting them is similar or better than the one provided by well-known state-of-the-art algorithms, while the complexity of the overall process is significantly reduced.

SPIE Journal Paper | 29 May 2015 Open Access

On the hardware implementation of the arithmetic elements of the pairwise orthogonal transform

Lucana Santos, Ian Blanes, Aday García, Joan Serra-Sagristà, José López, Roberto Sarmiento

JARS, Vol. 9, Issue 01, 097496, (May 2015) https://doi.org/10.1117/12.10.1117/1.JRS.9.097496

KEYWORDS: Field programmable gate arrays, Image compression, Digital signal processing, Hyperspectral imaging, Space operations, Multispectral imaging, Image quality standards, Satellites, Data compression, Data storage

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Proceedings Article | 17 November 2014 Paper

FPGA implementation of the hyperspectral Lossy Compression for Exomars (LCE) algoritm.

Aday García, L. Santos, S. López, G. Callicó, J. López, R. Sarmiento

Proceedings Volume 9247, 924705 (2014) https://doi.org/10.1117/12.2069493

KEYWORDS: Field programmable gate arrays, Image compression, Control systems, Algorithms, Hyperspectral imaging, Remote sensing, Signal processing, Sensors, Digital signal processing, Error analysis

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Proceedings Article | 15 October 2014 Paper

A novel highly-parallel algorithm for linearly unmixing hyperspectral images

Raúl Guerra, Sebastián López, Gustavo Callico, Jose López, Roberto Sarmiento

Proceedings Volume 9247, 92470H (2014) https://doi.org/10.1117/12.2068332

KEYWORDS: Hyperspectral imaging, Image processing, Signal to noise ratio, Reconstruction algorithms, Evolutionary algorithms, Computer simulations, Mathematical modeling, Image quality, Image filtering, Image analysis

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Proceedings Article | 22 May 2014 Paper

On the acceleration of the N-FINDER algorithm for hyperspectral endmembers extraction

Raul Guerra, Sebastian López, Gustavo Callicó, Jose Lopez, Roberto Sarmiento

Proceedings Volume 9124, 91240H (2014) https://doi.org/10.1117/12.2050868

KEYWORDS: Hyperspectral imaging, Principal component analysis, Image processing, Evolutionary algorithms, Phase modulation, Signal to noise ratio, Data modeling, Feature extraction, Computer simulations, Algorithm development

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Proceedings Article | 22 May 2014 Paper

Efficient lossy compression implementations of hyperspectral images: tools, hardware platforms, and comparisons

Aday García, Lucana Santos, Sebastián López, Gustavo Callicó, Jose Lopez, Roberto Sarmiento

Proceedings Volume 9124, 912408 (2014) https://doi.org/10.1117/12.2051132

KEYWORDS: Field programmable gate arrays, Image compression, Hyperspectral imaging, Satellites, Algorithms, Sensors, Signal processing, Digital signal processing, Neodymium, Control systems

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SPIE Journal Paper | 2 August 2013 Open Access

Lossy hyperspectral image compression on a graphics processing unit: parallelization strategy and performance evaluation

Lucana Falcon, Enrico Magli, Raffaele Vitulli, Antonio Nunez, Jose Lopez, Roberto Sarmiento

JARS, Vol. 7, Issue 01, 074599, (August 2013) https://doi.org/10.1117/12.10.1117/1.JRS.7.074599

KEYWORDS: Image compression, Hyperspectral imaging, Graphics processing units, Computer architecture, Error analysis, Quantization, Parallel computing, Image quality, Algorithms, Profiling

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Proceedings Article | 28 May 2013 Paper

A hierarchical scheduling and management solution for dynamic reconfiguration in FPGA-based embedded systems

T. Cervero, A. Gómez, S. López, R. Sarmiento, J. Dondo, F. Rincón, J. C. López

Proceedings Volume 8764, 87640J (2013) https://doi.org/10.1117/12.2021270

KEYWORDS: Field programmable gate arrays, Embedded systems, Multimedia, Ions, Control systems, Systems modeling, Logic, Matrices, Lanthanum, Digital signal processing

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Proceedings Article | 12 October 2011 Paper

Lossy hyperspectral image compression with state-of-the-art video encoder

Lucana Santos, Sebastian López, Gustavo Callicó, Jose F. López, Roberto Sarmiento

Proceedings Volume 8183, 81830G (2011) https://doi.org/10.1117/12.898523

KEYWORDS: Image compression, Hyperspectral imaging, Computer programming, Signal to noise ratio, Video, Video compression, Video coding, Algorithm development, Image quality standards, Standards development

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Proceedings Article | 3 May 2011 Paper

Performance analysis of the scalable video coding (SVC) extension of H.264/AVC for constrained scenarios

N. Suarez, Gustavo Callico, Sebastian Lopez, Jose Lopez, Roberto Sarmiento

Proceedings Volume 8067, 80670J (2011) https://doi.org/10.1117/12.888269

KEYWORDS: Scalable video coding, Video, Standards development, Video coding, On-screen displays, Spatial resolution, Signal to noise ratio, Temporal resolution, Computer programming, Lanthanum

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Proceedings Article | 3 May 2011 Paper

Scalable 2D architecture for H.264 SVC deblocking filter with reconfiguration capabilities for on-demand adaptation

T. Cervero, A. Otero, E. de la Torre, S. López, G. Callicó, T. Riesgo, R. Sarmiento

Proceedings Volume 8067, 80670K (2011) https://doi.org/10.1117/12.887951

KEYWORDS: Scalable video coding, Field programmable gate arrays, Clocks, Video, Standards development, Electroluminescence, Neodymium, Image processing, Chemical elements, Computer programming

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Proceedings Article | 3 May 2011 Paper

NoC emulation framework based on Arteris NoC solution for multiprocessor system-on-chip

José Mori, Félix Tobajas, Valentín de Armas, Roberto Sarmiento

Proceedings Volume 8067, 80670I (2011) https://doi.org/10.1117/12.887474

KEYWORDS: Network on a chip, System on a chip, Field programmable gate arrays, Computer aided design, Clocks, Telecommunications, Switches, Data storage, Statistical analysis

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Proceedings Article | 3 May 2011 Paper

Dynamically reconfigurable router for NoC congestion reduction

Juan Rosales, Félix Tobajas, Valentín de Armas, José Mori, Roberto Sarmiento

Proceedings Volume 8067, 80670H (2011) https://doi.org/10.1117/12.887473

KEYWORDS: Network on a chip, Signal processing, Switches, Clocks, Process control, Switching, Stochastic processes, Data storage, Lanthanum, System on a chip

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Proceedings Article | 28 May 2009 Paper

Survey of reconfigurable architectures for multimedia applications

T. Cervero, S. López, G. Callicó, F. Tobajas, V. de Armas, J. López, R. Sarmiento

Proceedings Volume 7363, 736303 (2009) https://doi.org/10.1117/12.821713

KEYWORDS: Multimedia, Field programmable gate arrays, Computer architecture, Switches, Data communications, Array processing, Computer programming, Process control, Signal processing, Video processing

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Proceedings Article | 28 May 2009 Paper

NoC generation of an optimal memory distribution for multimedia systems

Raúl Regidor, Félix Tobajas, Valentin de Armas, Eduardo de la Torre, Teresa Riesgo, Roberto Sarmiento

Proceedings Volume 7363, 73630P (2009) https://doi.org/10.1117/12.821523

KEYWORDS: Network on a chip, Multimedia, Telecommunications, Networks, Video processing, System on a chip, Process modeling, Digital signal processing, Modeling, Video

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Proceedings Article | 28 May 2009 Paper

Anisotropic quality measurement applied to H.264 video compression

G. Callico, Sebastián Lopez, Salvador Gabarda, Elena Gil, Gabriel Cristobal, José Lopez, Roberto Sarmiento

Proceedings Volume 7363, 73630I (2009) https://doi.org/10.1117/12.821652

KEYWORDS: Image quality, Video compression, Anisotropy, Quality measurement, Video, Image compression, Image quality standards, Computer programming, Quantization, Visual system

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Proceedings Article | 28 May 2009 Paper

Hardware implementation of a scheduler for high performance switches with quality of service (QoS) support

R. Arteaga, F. Tobajas, V. De Armas, R. Sarmiento

Proceedings Volume 7363, 73630B (2009) https://doi.org/10.1117/12.821522

KEYWORDS: Switches, Clocks, Field programmable gate arrays, Multiplexers, Global Positioning System, Switching, Control systems, Lanthanum, Data modeling, Head

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Proceedings Article | 10 May 2007 Paper

Variable length packet scheduler algorithm with QoS support

R. Arteaga, F. Tobajas, R. Esper-Chaín, M. Monzón, R. Regidor, V. De Armas, R. Sarmiento

Proceedings Volume 6590, 659012 (2007) https://doi.org/10.1117/12.721947

KEYWORDS: Switches, Global Positioning System, Computer architecture, Lanthanum, C++, Switching, Control systems, Microelectronics, Fiber optics, Video

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Proceedings Article | 10 May 2007 Paper

Implementation of a parametrizable router architecture for networks-on-chip (NoC) with quality of service (QoS) support

R. Regidor, F. Tobajas, V. De Armas, J. Rivero, R. Sarmiento

Proceedings Volume 6590, 65901L (2007) https://doi.org/10.1117/12.721922

KEYWORDS: Network on a chip, Switching, Network architectures, System on a chip, Clocks, Transistors, Receivers, Telecommunications, Circuit switching, Time division multiplexing

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Proceedings Article | 10 May 2007 Paper

Toward the implementation of a baseline H.264/AVC decoder onto a reconfigurable architecture

S. López, A. Kanstein, J. López, M. Berekovic, R. Sarmiento, J.-Y. Mignolet

Proceedings Volume 6590, 65900A (2007) https://doi.org/10.1117/12.722042

KEYWORDS: Video, Embedded systems, Digital filtering, Video coding, Profiling, Computer programming, Control systems, Multimedia, Digital signal processing, Quantization

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Proceedings Article | 30 June 2005 Paper

A quarter pixel precision motion estimation architecture for H.264/AVC video coding

S. Lopez, F. Tobajas, A. Villar, J. Bienes, V. de Armas, G. Callico, J. Lopez, R. Sarmiento

Proceedings Volume 5837, (2005) https://doi.org/10.1117/12.608240

KEYWORDS: Motion estimation, Computer architecture, Multiplexers, Video coding, Autoregressive models, Distortion, Signal processing, Image processing, Standards development, Field programmable gate arrays

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Proceedings Article | 30 June 2005 Paper

A novel gigabit multidrop serial link for high-speed digital systems

F. Tobajas, R. Esper-Chain, R. Arteaga, O. Santana, V. de Armas, Roberto Sarmiento

Proceedings Volume 5837, (2005) https://doi.org/10.1117/12.608259

KEYWORDS: Receivers, Resistors, High speed digital systems, Transmitters, Signal attenuation, Switches, Connectors, Prototyping, Dielectrics, Data transmission

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Proceedings Article | 30 June 2005 Open Access

Practical considerations for real-time super-resolution implementation techniques over video coding platforms

Gustavo Callico, Sebastian Lopez, Rafael Peset Llopis, Ramanathan Sethuraman, Antonio Nunez, Jose Lopez, Margarita Marrero, Roberto Sarmiento

Proceedings Volume 5837, (2005) https://doi.org/10.1117/12.608322

KEYWORDS: Intelligence systems, Algorithm development, Image processing, Video, Computer programming, Image quality, Super resolution, Image resolution, Motion estimation, Video surveillance

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Proceedings Article | 30 June 2005 Paper

A low-cost bidimensional smart pixel network for video coding operations

S. Lopez, G. Callico, J. Lopez, R. Sarmiento

Proceedings Volume 5837, (2005) https://doi.org/10.1117/12.608263

KEYWORDS: Discrete wavelet transforms, Image processing, Video coding, Multimedia, Prototyping, Wavelets, Computer programming, Control systems, Photodetectors, Video compression

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