fsolt

  • Compressive optical imaging with a photonic lantern

    New single-pixel camera design, but this time using multicore fibers (MCF) and a photonic lantern instead of a spatial light modulator. Cool! The fundamental idea is to excite one of the cores of a MCF. Then, light propagates through the fiber, which has a photonic lantern at the tip that generates a random-like light pattern at its tip. Exciting different cores… … Leer más

  • Single-pixel imaging with sampling distributed over simplex vertices

    Last week I posted a recently uploaded paper on using positive-only patterns in a single-pixel imaging system. Today I just found another implementation looking for the same objective. This time the authors (from University of Warsaw, leaded by Rafał Kotyński) introduce the idea of simplexes, or how any point in some N-dimensional space can be… … Leer más

  • Handling negative patterns for fast single-pixel lifetime imaging

    A group of researchers working in France and USA, leaded by N. Ducros, has uploaded an interesting paper this week. When doing single-pixel imaging, one of the most important aspects you need to take into account is the kind of structured patters (functions) you are going to use. This is quite relevant because it is… … Leer más

  • Wavefront correction in two-photon microscopy with a multi-actuator adaptive lens

    The group leaded by P. Artal at Murcia University has recently published an interesting paper related to adaptive optics using an adaptive lens. When working in a real scenario, imperfections in the optical elements you use or just the objects you want to image introduce optical aberrations in the pictures you obtain. Usually these aberrations reduce… … Leer más

  • Evading scientific stalemates

    This week I have been thinking about a strange thing that happened in my research group. One day while I was doing my MSc, me and my colleagues we were discussing some lab results. A small change on our experimental setup provided much better images than the ones we were getting up to that point.… … Leer más

  • Weekly recap (29/04/2018)

    This week we have a lot of interesting stuff: Observing the cell in its native state: Imaging subcellular dynamics in multicellular organisms Adaptive Optics + Light Sheet Microscopy to see living cells inside the body of a Zebra fish (the favorite fish of biologists!). Really impressive images overcoming scattering caused by tissue. You can read… … Leer más

  • The week in papers (22/04/18)

    As a way to keep posts going, I am starting a short recap about interesting papers being published (or being discovered) every now and then. Probably I will write longer posts about some of them in the future. Let’s get this thing going: Two papers using ‘centroid estimation‘ to retrieve interesting information: Extract voice information… … Leer más

  • Kilohertz binary phase modulator for pulsed laser sources using a digital micromirror device

    People at Judkewitz lab tend to do really cool stuff. This time they have implemented a binary phase modulator using a DMD. Kilohertz binary phase modulator for pulsed laser sources using a digital micromirror device, M. Hoffmann et al, at Optics Letters Abstract: The controlled modulation of an optical wavefront is required for aberration correction,… … Leer más

  • Light transport and imaging through complex media & Photonics West 2018

    Last ~20 days have been completely crazy. First, I went to a meeting organized by the Royal Society: Light transport and imaging through complex media. It was amazing. Beautiful place, incredible researchers, and a nice combination of signal processing and optical imaging. I am sure I will be looking for future editions. After that, I assisted… … Leer más

  • Optical companding

    Christmas came and gone, and I am still trying to keep up with some papers I’ve read in the last months. The guys at UCLA keep doing impressive stuff. First time I saw something from them was their work on Nature about ultrafast optical imaging (woah!). This time they have proposed a way to improve the… … Leer más

  • Focusing light through dynamical samples using fast continuous wavefront optimization

    The guys at LKB keep going inside turbid media. This time, they have done it really fast. By using a phase spatial light modulator and with the help of a FPGA card, they were able to focus light through a scattering medium at a rate of ~4 kHz. This is trying to solve a common problem… … Leer más

  • Realization of hybrid compressive imaging strategies

    Recently I have been reading a lot about Compressive Sensing strategies. One of the things we always want when we work in a single-pixel architecture is to project the lowest possible number of masks, because the projecting process is the longest in all the acquisition procedure (and it gets longer and longer when you increase… … Leer más

  • Deep learning microscopy

    This week a new paper by the group leaded by A. Ozcan appeared in Optica. Deep learning microscopy, Y. Ribenson et al, at Optica (featured image exctracted from Fig. 6 of the supplement) Abstract, We demonstrate that a deep neural network can significantly improve optical microscopy, enhancing its spatial resolution over a large field of view… … Leer más

  • Imaging through glass diffusers using densely connected convolutional networks

    I just found a new paper by the group of G. Barbastathis at MIT. Imaging through glass diffusers using densely connected convolutional networks, S. Li et al, Submitted on 18 Nov 2017, https://arxiv.org/abs/1711.06810 (featured image from Fig. 3 of the manuscript) Abstract, Computational imaging through scatter generally is accomplished by first characterizing the scattering medium so that… … Leer más

  • Experimental comparison of single-pixel imaging algorithms

    I just read on ArXiv.org that L. Bian and his colleagues made a cool comparison between several ways of performing single-pixel imaging. They have tested the performance on several recovery procedures, some quite familiar but others not so well stablished. I find both Table 1 and Fig. 7 extremely interesting. One sums up really well the… … Leer más

  • Toward Depth Estimation Using Mask-Based Lensless Cameras

    I just discovered on ArXiv.org a new paper by M. Asif, one of the guys behind the FlatCam. Toward Depth Estimation Using Mask-Based Lensless Cameras, M. Asif, submitted November 9th, http://arxiv.org/abs/1711.03527 (featured image extracted from Fig.1 of the manuscript) Abstract: Recently, coded masks have been used to demonstrate a thin form-factor lensless camera, FlatCam, in which a… … Leer más