fsolt

  • The weekly recap (2021#15)

    Crazy things happening in the world this week. The header image of this post (well, the one in the header is a copy) was sold for $1.36 million. This NFT stuff still goes over my head, but seems like is something that will stick around, whether it really makes sense to burn energy this way… … Leer más

  • the Weekly recap

    Let’s see for how long can I do this section this time… Lots of really cool stuff happening right now to be honest. I hope this short recap is interesting! Another one bites the dust This week we found out that Yahoo! Answers is shutting down. Another cool site from an old internet era that … Leer más

  • ¿Dejaremos de comprar un FIFA cada año?

    Hace tiempo que me ronda por la cabeza la idea de cómo ha ido cambiando el modelo de negocio en la industria del videojuego. En la última década hemos visto como el modelo digital ha ido comiéndose al modelo físico poco a poco. Las ventas han ido creciendo, impulsadas por una clara serie de ventajas. … Leer más

  • Single pixel hyperspectral bioluminescence tomography based on compressive sensing

    Really cool implementation of Single-pixel Imaging + Compressive Sensing from the people at University of Birmingham. Using hyperspectral data measured with a single-pixel spectrometer + tomographic reconstruction, they show that it is possible to perform Bioluminiscence Imaging. Nice to see that the topics I used to work keep showing super cool results. Single pixel hyperspectral … Leer más

  • Data fusion as a way to perform compressive sensing

    Some time ago I started working on some kind of data fusion problem where we have access to several imaging systems working in parallel, each one gathering a different multidimensional dataset with mixed spectral, temporal, and/or spatial resolutions. The idea is to perform 4D imaging at high spectral, temporal, and spatial resolutions using some single-pixel/multi-pixel … Leer más

  • Instant ghost imaging: algorithm and on-chip implementation

    Nice ghost imaging implementation on a chip. Even though the optical part has been quite well-known for a while, I really like the fact that more groups are starting to incorporate FPGA cards in their optical systems (if only they were easier to use!). Seems like a very interesting way of speeding-up the post-processing of … Leer más

  • Single frame wide-field Nanoscopy based on Ghost Imaging via Sparsity Constraints (GISC Nanoscopy)

    This just got posted on the arXiv, and has some interesting ideas inside. Using a ground glass diffuser before a pixelated detector, and after a calibrating procedure where you measure the associated speckle patterns when scanning the sample plane, a single shot of the fluorescence signal speckle pattern can be used to retrieve high spatial … Leer más

  • Simultaneous multiplane imaging with reverberation multiphoton microscopy

    Really nice pre-print by the people at Boston University, leaded by J. Mertz. Love the idea of generating ~infinite focal spots (until you run out of photons) inside a sample, and using a extremely fast single-pixel detector to recover the signal. Very original way to tackle volumetric imaging in bio-imaging! Simultaneous multiplane imaging with reverberation … Leer más

  • Inverse Scattering via Transmission Matrices: Broadband Illumination and Fast Phase Retrieval Algorithms

    Interesting paper by people at Rice and Northwestern universities about different phase retrieval algorithms for measuring transmission matrices without using interferometric techniques. The thing with interferometers is that they provide you lots of cool stuff (high sensibility, phase information, etc.), but also involve quite a lot of technical problems that you do not want to … Leer más

  • De-scattering with Excitation Patterning (DEEP) Enables Rapid Wide-field Imaging Through Scattering Media

    Very interesting stuff from the people at MIT regarding imaging through scattering media. Recently, multiple approaches taking advantage of temporal focusing (TF) increased efficiency inside scattering media when using two-photon microscopy have been published, and this goes a step further. Here, the authors use wide-field structured illumination, in combination with TF, to obtain images with … Leer más

  • Rapid broadband characterization of scattering medium using hyperspectral imaging

    People at LKB (and St. Andrews) keep shining light into scattering media. This time, they have developed a cool approach for measuring the multispectral Transmission Matrix (MSTM) of a medium. This knowledge allows to control each spectral component of a light beam when travelling through the medium, which permits to shape, for example, the spectral … Leer más

  • 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