Sabato Ceruso, Sergio Bonaque-González, Ricardo Oliva-García, José Manuel Rodríguez-Ramos
The problem of reconstructing a depth map from a sequence of differently focused images (focal stack) is called Depth from focus. The core idea of this method is to analyze the sharpness of each pixel and compare it along the axis of the focal stack to estimate the true depth value. This approach has two main drawbacks: it depends on the optics of the camera and on the focus measure operator…
José G. Marichal-Hernández, Ricardo Oliva-García, Óscar Gómez-Cárdenes, Iván Rodríguez-Méndez, José M. Rodríguez-Ramos
The Radon transform is a valuable tool in inverse problems such as the ones present in electromagnetic imaging. Up to now the inversion of the multiscale discrete Radon transform has been only possible by iterative numerical methods while the continuous Radon transform is usually tackled…
Wooptix’ team with the collaboration of Damien Gatinel & Jack T. Holladay
In this work, we characterize the in vivo ocular optics of the human eye with a lateral resolution of 8.6 microns, which implies roughly 1 million measurement points for a pupil diameter of 9 mm. The results suggest that the normal human eye presents a series of hitherto unknown optical patterns. This discovery could have a great impact on the way we understand some fundamental mechanisms of human vision.
Juan Manuel Trujillo-Sevilla, José Manuel Rodríguez-Ramos, Jan Olaf Gaudestad
In this paper we introduce a new metrology technique for measuring wafer geometry on silicon wafers. Wave Front Phase Imaging (WFPI) has high lateral resolution and is sensitive enough to measure roughness on a silicon wafer by simply acquiring a single image snapshot of the entire wafer.
Sergio Bonaque, Juan Manuel Trujillo, Oscar Casanova, David Carmona, Miguel Sicilia, Sabato Ceruso, Jan Gaudestad, José Manuel Rodríguez-Ramos
We present a new wave front sensing technique based on detecting the propagating light waves. This allows the user to acquire millions of data points within the pupil of the human eye; a resolution several orders of magnitude higher than current industry standard ophthalmic devices.
Juan Manuel Trujillo-Sevilla, Jose Manuel Ramos-Rodríguez, Jan Gaudestad
Wavefront phase imaging (WFPI) is a new technique to measure wafer geometry on a full wafer in a single image snapshot providing depth information for every pixel. The number of topography data points for the entire wafer will be proportional to the number of pixels in the image sensor, allowing for millions of data points to be acquired in less than a second.
Wave front phase imaging of wafer geometry using high pass filtering to reveal nanotopography / January 2020
Juan Manuel Trujillo, Jose Manuel Ramos-Rodríguez, Jan Gaudestad
In this paper we show that Wave Front Phase Imaging (WFPI) has high lateral resolution and high sensitivity enabling it to measure nanotopography and roughness on a silicon wafer by simply acquiring a single image of the entire wafer. WFPI is achieved by measuring the reflected light intensity from monochromatic…
Óscar Gómez, Ricardo Oliva, Gabriel A. Rodríguez, José G. Marichal
Discrete Radon Transform, DRT, is an integral transform that computes the complete set, in terms of slope and intercepts, of line integrals through a two-dimensional domain. It exhibits linearithmic computational complexity and avoids the usage of real numbers thanks to a divide and conquer, or multiscale, approach with a loose definition of discrete lines.