Dr. César Sanz Álvaro Profile

Dr. César Sanz Álvaro

at Univ Politecnica de Madrid

SPIE Involvement:

Author

Proceedings Article | 5 October 2017 Paper

Parallel exploitation of a spatial-spectral classification approach for hyperspectral images on RVC-CAL

R. Lazcano, D. Madroñal, H. Fabelo, S. Ortega, R. Salvador, G. Callicó, E. Juárez, C. Sanz

Proceedings Volume 10430, 104300A (2017) https://doi.org/10.1117/12.2279613

KEYWORDS: Hyperspectral imaging, Image classification, Image processing, Principal component analysis, Algorithm development, Machine learning, Parallel processing

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Proceedings Article | 24 October 2016 Presentation + Paper

Parallel implementation of a hyperspectral image linear SVM classifier using RVC-CAL

D. Madroñal , H. Fabelo, R. Lazcano, G. M. Callicó, E. Juárez, C. Sanz

Proceedings Volume 10007, 1000709 (2016) https://doi.org/10.1117/12.2241648

KEYWORDS: Hyperspectral imaging, Image processing, Spectral resolution, Ultraviolet radiation, Remote sensing, Infrared imaging, Information security, Analytical research, Binary data, Classification systems

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Proceedings Article | 24 October 2016 Presentation + Paper

Parallelism exploitation of a PCA algorithm for hyperspectral images using RVC-CAL

R. Lazcano, I. Sidrach-Cardona , D. Madroñal, K. Desnos, M. Pelcat, E. Juárez, C. Sanz

Proceedings Volume 10007, 100070H (2016) https://doi.org/10.1117/12.2241643

KEYWORDS: Principal component analysis, Hyperspectral imaging, Sensors, Data processing, Image processing, Electromagnetism, Remote sensing, Data modeling, Chemical elements, Spatial resolution

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Hyperspectral imaging (HI) collects information from across the electromagnetic spectrum, covering a wide range of wavelengths. The tremendous development of this technology within the field of remote sensing has led to new research fields, such as cancer automatic detection or precision agriculture, but has also increased the performance requirements of the applications. For instance, strong time constraints need to be respected, since many applications imply real-time responses. Achieving real-time is a challenge, as hyperspectral sensors generate high volumes of data to process. Thus, so as to achieve this requisite, first the initial image data needs to be reduced by discarding redundancies and keeping only useful information. Then, the intrinsic parallelism in a system specification must be explicitly highlighted.

In this paper, the PCA (Principal Component Analysis) algorithm is implemented using the RVC-CAL dataflow language, which specifies a system as a set of blocks or actors and allows its parallelization by scheduling the blocks over different processing units. Two implementations of PCA for hyperspectral images have been compared when aiming at obtaining the first few principal components: first, the algorithm has been implemented using the Jacobi approach for obtaining the eigenvectors; thereafter, the NIPALS-PCA algorithm, which approximates the principal components iteratively, has also been studied. Both implementations have been compared in terms of accuracy and computation time; then, the parallelization of both models has also been analyzed.

These comparisons show promising results in terms of computation time and parallelization: the performance of the NIPALS-PCA algorithm is clearly better when only the first principal component is achieved, while the partitioning of the algorithm execution over several cores shows an important speedup for the PCA-Jacobi. Thus, experimental results show the potential of RVC–CAL to automatically generate implementations which process in real-time the large volumes of information of hyperspectral sensors, as it provides advanced semantics for exploiting system parallelization.

Proceedings Article | 20 October 2015 Paper

Dimensionality reduction and endmember extraction for hyperspectral imaging using an RVC-CAL library

D. Madroñal Quintín, R. Lazcano López, E. Juárez Martínez, C. Sanz Álvaro

Proceedings Volume 9646, 964604 (2015) https://doi.org/10.1117/12.2195093

KEYWORDS: Hyperspectral imaging, Algorithm development, Image processing, Principal component analysis, Surgery, Chemical elements, Cancer, Infrared imaging, Infrared radiation, Ultraviolet radiation

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Proceedings Article | 20 October 2015 Paper

RVC-CAL library for endmember and abundance estimation in hyperspectral image analysis

R. Lazcano López, D. Madroñal Quintín, E. Juárez Martínez, C. Sanz Álvaro

Proceedings Volume 9646, 964609 (2015) https://doi.org/10.1117/12.2194888

KEYWORDS: Hyperspectral imaging, Image processing, Algorithm development, Image analysis, Signal to noise ratio, Cancer, Surgery, Matrices, Analytical research, Remote sensing

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Hyperspectral imaging (HI) collects information from across the electromagnetic spectrum, covering a wide range of wavelengths. Although this technology was initially developed for remote sensing and earth observation, its multiple advantages - such as high spectral resolution - led to its application in other fields, as cancer detection. However, this new field has shown specific requirements; for instance, it needs to accomplish strong time specifications, since all the potential applications - like surgical guidance or in vivo tumor detection - imply real-time requisites. Achieving this time requirements is a great challenge, as hyperspectral images generate extremely high volumes of data to process. Thus, some new research lines are studying new processing techniques, and the most relevant ones are related to system parallelization.

In that line, this paper describes the construction of a new hyperspectral processing library for RVC–CAL language, which is specifically designed for multimedia applications and allows multithreading compilation and system parallelization. This paper presents the development of the required library functions to implement two of the four stages of the hyperspectral imaging processing chain--endmember and abundances estimation. The results obtained show that the library achieves speedups of 30%, approximately, comparing to an existing software of hyperspectral images analysis; concretely, the endmember estimation step reaches an average speedup of 27.6%, which saves almost 8 seconds in the execution time. It also shows the existence of some bottlenecks, as the communication interfaces among the different actors due to the volume of data to transfer. Finally, it is shown that the library considerably simplifies the implementation process. Thus, experimental results show the potential of a RVC–CAL library for analyzing hyperspectral images in real-time, as it provides enough resources to study the system performance.

Proceedings Article | 3 May 2011 Paper

Energy consumption estimation of an OMAP-based Android operating system

Gabriel González, Eduardo Juárez, Juan José Castro, César Sanz

Proceedings Volume 8067, 80670V (2011) https://doi.org/10.1117/12.888264

KEYWORDS: Digital signal processing, Signal processing, Multimedia, Operating systems, Video, Embedded systems, Video processing, Clocks, Process modeling, Manufacturing

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Proceedings Article | 28 May 2009 Paper

A system for emulating the broadcasting of a DAB ensemble containing data services

David Samper, Pedro Lobo, Manuel César Rodríguez, César Sanz

Proceedings Volume 7363, 73630J (2009) https://doi.org/10.1117/12.821490

KEYWORDS: Receivers, Interfaces, Video, Transmitters, Error control coding, Prototyping, Standards development, Field programmable gate arrays, Human-machine interfaces, Transceivers

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Proceedings Article | 28 May 2009 Paper

Implementation of a media synchronization algorithm for multistandard IP set-top box systems

Esther Estévez, David Samper, Fernando Pescador, Eduardo Juárez, César Sanz

Proceedings Volume 7363, 73630L (2009) https://doi.org/10.1117/12.821641

KEYWORDS: Video, Digital signal processing, Clocks, Photoemission spectroscopy, Computer programming, Computer architecture, Receivers, Multimedia, Digital video discs, On-screen displays

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Proceedings Article | 10 May 2007 Paper

Multiformat decoder for a DSP-based IP set-top box

F. Pescador, M. J. Garrido, C. Sanz, E. Juárez, D. Samper, R. Antoniello

Proceedings Volume 6590, 65900Z (2007) https://doi.org/10.1117/12.722287

KEYWORDS: Digital signal processing, Video, Surface plasmons, Digital video discs, Clocks, Internet, Computer programming, Video coding, Computer architecture, Data storage

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Showing 5 of 9 publications

Conference Committee Involvement (4)

VLSI Circuits and Systems

18 April 2011 | Prague, Czech Republic

VLSI Circuits and Systems

4 May 2009 | Dresden, Germany

VLSI Circuits and Systems

2 May 2007 | Maspalomas, Gran Canaria, Spain

VLSI Circuits and Systems

19 May 2003 | Maspalomas, Gran Canaria, Canary Islands, Spain

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