Dr. Pablo F. Meza Narvaez Profile

Dr. Pablo F. Meza Narvaez

Professor at Univ de La Frontera

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Author

Publications (10)

Proceedings Article | 17 June 2024 Poster + Paper

Coded aperture design for temporal compressive imaging in a color-polarized video

Josefa Silva-Riquelme, Kareth León-López, Edson Mojica, Daniela Fritz, Pablo Meza

Proceedings Volume 13023, 130230G (2024) https://doi.org/10.1117/12.3017266

KEYWORDS: Video, Tunable filters, Polarization, Cameras, Optical filters, Image restoration, Video compression, Design, Sensors, Matrices

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Temporal snapshot compressive imaging (SCI) allows high-dimensional temporal images to be reconstructed from a two-dimensional (2D) set of measurements. This is valuable for capturing color-polarized video data that can be used for robust material classification, considering that each material has a unique behavior in the way it polarizes the reflected light. In contrast to conventional commercial video cameras, which often compromise spatial, color, or polarization resolution to accommodate more information in the sensor, the SCI paradigm exploits optics, electronics and algorithms to produce high-resolution high-dimensional imaging from far fewer measurements. Commercial cameras can be adapted to capture additional information beyond their conventional sensing range when integrated with the SCI framework. This is achieved by incorporating an intensity modulation element that encodes and compress the data, and prevents incoherent sampling for nonlinear reconstruction based on compressive sensing principles. In this paper, an off-the-sheld camera is modified to compressively acquire and reconstruct high resolution spatio temporal polarization and color data from 2D measurements, leading to color-polarized video.The sensor camera uses a Bayer and a polarization filter superimposed on each other, aka RGB-P sensor. Then, a time-based designed coded aperture (CA) is incorporated into the optical path to temporally modulate each Bayer-polarized frame, where the modulated frames are integrated into a single measurement in the sensor. The CA is built with spatiotemporal block-unblock elements that encodes the information, in which its design restricts the distribution of those elements across the time dimension for reducing the temporal measurements redundancy, and, in turn, leading to better reconstructions. The compressed color-polarized video measurements are then recovered by using the alternating direction method of multipliers (ADMM) reconstruction algorithm. Numerical experiments show that temporal designed CA patterns outperforms random CA structures in terms of PSNR (Peak signal-to-noise ratio) and SSIM (structural similarity index measure), providing better-quality reconstructions of a color-polarized video from a dynamic scene.

Proceedings Article | 17 June 2024 Poster + Paper

Shifted coded aperture design for single pixel imaging systems

Edson Mojica, Jorge Guaiquil, Enrique Tajahuerce, Pablo Meza

Proceedings Volume 13023, 130230E (2024) https://doi.org/10.1117/12.3012701

KEYWORDS: Image restoration, Design, Coded apertures, Modulation, Matrices, Spatial light modulators, Imaging systems, Image compression

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SPIE Journal Paper | 9 March 2024

Single-shot super-resolution and non-uniformity correction through wavefront modulation in infrared imaging systems

Guillermo Machuca, Pablo Meza, Esteban Vera

JARS, Vol. 18, Issue 02, 022205, (March 2024) https://doi.org/10.1117/12.10.1117/1.JRS.18.022205

KEYWORDS: Infrared imaging, Lawrencium, Super resolution, Imaging systems, Image analysis, Image restoration, Nonuniformity corrections, Matrices, Wavefronts, Point spread functions

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Proceedings Article | 1 May 2017 Paper

Controlled aberrations for snapshot compressive imaging

Esteban Vera, Pablo Meza

Proceedings Volume 10222, 102220H (2017) https://doi.org/10.1117/12.2265186

KEYWORDS: Compressive imaging, Compressed sensing, Computational imaging, Point spread functions, Image compression, Cameras, Imaging systems, Diffraction, Matrices, Stars

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Proceedings Article | 22 September 2015 Paper

A digital architecture for striping noise compensation in push-broom hyperspectral cameras

Wladimir Valenzuela, Miguel Figueroa, Jorge Pezoa, Pablo Meza

Proceedings Volume 9599, 95992H (2015) https://doi.org/10.1117/12.2188421

KEYWORDS: Evolutionary algorithms, Cameras, Neural networks, Video, Field programmable gate arrays, Hyperspectral imaging, Error analysis, Logic, Image processing, Staring arrays

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Proceedings Article | 13 March 2014 Paper

Non-contact measurement technique for enzymatic reaction of glucokinase

Juan Staforelli, María Gallardo, Pablo Meza, Sergio Torres, Héctor Mella, Claudio Reyes

Proceedings Volume 8953, 89530L (2014) https://doi.org/10.1117/12.2037394

KEYWORDS: Infrared imaging, Thermography, Imaging systems, Infrared radiation, Cameras, Calibration, Temperature metrology, Infrared cameras, Interference (communication), Image resolution

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Proceedings Article | 19 November 2012 Paper

A prior knowledge model for multidimensional striping noise compensation in hyperspectral imaging devices

Pablo Meza, Jorge Pezoa, Francisca Parra, Sergio Torres

Proceedings Volume 8542, 854222 (2012) https://doi.org/10.1117/12.974720

KEYWORDS: Cameras, Near infrared, Mathematical modeling, Imaging systems, Sensors, Synthetic aperture radar, Hyperspectral imaging, Electro optical modeling, Modeling, Instrument modeling

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Proceedings Article | 18 May 2012 Paper

On the thermal-offset in NIR hyperspectral cameras

Francisca Parra, Jorge Pezoa, Pablo Meza, Sergio Torres, Octavio Zapata

Proceedings Volume 8354, 835411 (2012) https://doi.org/10.1117/12.919345

KEYWORDS: Cameras, Staring arrays, Near infrared, Thermal modeling, Imaging systems, Temperature metrology, Cooling systems, Data modeling, Systems modeling, Hyperspectral imaging

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Proceedings Article | 6 October 2011 Paper

Thermal characterization of a NIR hyperspectral camera

Francisca Parra, Pablo Meza, Jorge Pezoa, Sergio Torres

Proceedings Volume 8186, 81860Z (2011) https://doi.org/10.1117/12.898126

KEYWORDS: Cameras, Thermal modeling, Near infrared, Photodetectors, Sensors, Staring arrays, Calibration, Imaging systems, Data modeling, Error analysis

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Proceedings Article | 16 September 2011 Paper

A multidimensional approach for striping noise compensation in hyperspectral imaging devices

Pablo Meza, Francisca Parra, Sergio Torres, Jorge Pezoa, Pablo Coelho

Proceedings Volume 8155, 81550I (2011) https://doi.org/10.1117/12.892246

KEYWORDS: Cameras, Hyperspectral imaging, Algorithm development, Detection and tracking algorithms, Photodetectors, Image processing, Imaging systems, Sensors, Staring arrays, Spectral resolution

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Showing 5 of 10 publications

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