Publications de Luciano Sbaiz | EPFL Graph Search

Bits from Photons: Oversampled Image Acquisition Using Binary Poisson Statistics

Martin Vetterli, Luciano Sbaiz, Feng Yang, Yue Lu

We study a new image sensor that is reminiscent of traditional photographic film. Each pixel in the sensor has a binary response, giving only a one-bit quantized measurement of the local light intensity. To analyze its performance, we formulate the oversam ...

Institute of Electrical and Electronics Engineers2012

Image sensor having nonlinear response

Martin Vetterli, Luciano Sbaiz, Sabine Süsstrunk, Edoardo Charbon

In previously known imaging devices as in still and motion cameras, for example, image sensor signal response typically is linear as a function of intensity of incident light. Desirably, however, akin to the response of the human eye, response is sought to ...

2011

Image annotation on portable devices

Martin Vetterli, Luciano Sbaiz

A system for automated annotation of images and videos points a mobile device towards an object of interest, such as a building or landscape scenery, for the device to display an image of the scene with an annotation for the object. An annotation can inclu ...

2010

Acoustic tomography for scalar and vector fields: theory and application to temperature and wind estimation

Martin Vetterli, Luciano Sbaiz, Ivana Jovanovic

Acoustic tomography is a type of inverse problem. The idea of estimating physical quantities that influence sound propagation by measuring the parameters of propagation has proven to be successful in many practical domains, including temperature and wind e ...

2009

Image Reconstruction in the Gigavision Camera

Martin Vetterli, Luciano Sbaiz, Sabine Süsstrunk, Edoardo Charbon, Feng Yang

Recently we have proposed a new image device called the gigavision camera. The main feature of this camera is that the pixels have a binary response. The response function of a gigavision sensor is non-linear and similar to a logarithmic function, which ma ...

2009

The Gigavision Camera

Martin Vetterli, Luciano Sbaiz, Sabine Süsstrunk, Edoardo Charbon, Feng Yang

We propose a new image device called gigavision camera. The main differences between a conventional and a gigavision camera are that the pixels of the gigavision camera are binary and orders of magnitude smaller. A gigavision camera can be built using stan ...

2009

Groebner Basis Methods for Multichannel Sampling with Unknown Offsets

Martin Vetterli, Luciano Sbaiz, Patrick Vandewalle

In multichannel sampling, several sets of sub-Nyquist sampled signal values are acquired. The offsets between the sets are unknown, and have to be resolved, just like the parameters of the signal itself. This problem is nonlinear in the offsets, but linear ...

Elsevier2008

Sound Field Analysis Along a Circle and its Application to HRTF Interpolation

Martin Vetterli, Luciano Sbaiz, Christof Faller, Thibaut Ajdler

The sampling and interpolation of a sound field in two and three dimensions along a circle is discussed. The Fourier domain representation of the sound field is used, and an angular sampling theorem is developed for the sampling of the sound field along a ...

2008

Higher Order SVD Analysis for Dynamic Texture Synthesis

Luciano Sbaiz, Sabine Süsstrunk, Roberto Costantini

Videos representing flames, water, smoke, etc. are often defined as dynamic textures: "textures" because they are characterized by redundant repetition of a pattern and "dynamic" because this repetition is also in time and not only in space. Dynamic textur ...

Institute of Electrical and Electronics Engineers2008

Super-Resolution from Unregistered and Totally Aliased Signals Using Subspace Methods

Martin Vetterli, Luciano Sbaiz, Patrick Vandewalle

In many applications, the sampling frequency is limited by the physical characteristics of the components: the pixel pitch, the rate of the A/D converter, etc. A low-pass filter is then often applied before the sampling operation to avoid aliasing. However ...

Institute of Electrical and Electronics Engineers2007

Tomographic approach for parametric estimation of local diffusive sources and application to heat diffusion

Martin Vetterli, Luciano Sbaiz, Ivana Jovanovic

We consider localized instantaneous sources that reside in a 2D dif- fusive environment. Our goal is to reconstruct the induced field from the measurements obtained by distributed sensors. Although the field is non-bandlimited, we capitalize on the fact th ...

2007

Noninvasive temperature monitoring in breast-mimicking phantoms using acoustic tomography

Martin Vetterli, Luciano Sbaiz, Ivana Jovanovic

2007

Efficient and Stable Acoustic Tomography Using Sparse Reconstruction Methods

Martin Vetterli, Luciano Sbaiz, Ivana Jovanovic, Ali Hormati

We study an acoustic tomography problem and propose a new inversion technique based on sparsity. Acoustic tomography observes the parameters of the medium that influence the speed of sound propagation. In the human body, the parameters that mostly influenc ...

2007

Dynamic Measurement of Room Impulse Responses using a Moving Microphone

Martin Vetterli, Luciano Sbaiz, Thibaut Ajdler

A novel technique for the recording of large sets of room impulse responses or head-related transfer functions is presented. The technique uses a microphone or a loudspeaker moving with constant speed. Given a setup (e.g. length of the room impulse respons ...

2007

Spatio-Temporal Sampling and Distributed Compression of the Sound Field

Martin Vetterli, Robert Konsbruck, Luciano Sbaiz, Olivier Roy, Emre Telatar, Thibaut Ajdler

We investigate how the sound field induced by an acoustic event evolves over space and time. The characteristics of its bidimensional Fourier spectrum are analyzed and spatio-temporal sampling results using an array of microphones are provided for differen ...

2006

Registration of Aliased Images for Super-Resolution Imaging

Martin Vetterli, Luciano Sbaiz, Sabine Süsstrunk, Patrick Vandewalle

Super-resolution imaging techniques reconstruct a high resolution image from a set of low resolution images that are taken from almost the same point of view. The problem can be subdivided into two main parts: an image registration part where the different ...

2006

Signal Reconstruction from Multiple Unregistered Sets of Samples using Groebner Bases

Martin Vetterli, Luciano Sbaiz, Patrick Vandewalle

We present a new method for signal reconstruction from multiple sets of samples with unknown offsets. We rewrite the reconstruction problem as a set of polynomial equations in the unknown signal parameters and the offsets between the sets of samples. Then, ...

2006

Dynamic Texture Synthesis: Compact Models Based on Luminance -Chrominance Color Representation

Luciano Sbaiz, Sabine Süsstrunk, Roberto Costantini

Dynamic textures are sequences of images showing temporal regularity. Examples can be found in videos representing smoke, flames, ocean waves, wind-shaken forests, etc. Dynamic texture modelling and synthesis has usually been done considering RGB color ima ...

2006

Room impulse responses measurement using a moving microphone

Martin Vetterli, Luciano Sbaiz, Thibaut Ajdler

In this paper, we present a technique to record a large set of room impulse responses using a microphone moving along a tra jectory. The technique processes the signal recorded by the microphone to reconstruct the signals that would have been recorded at a ...

2006

On a stochastic version of the plenacoustic function

Martin Vetterli, Luciano Sbaiz, Andrea Ridolfi, Thibaut Ajdler

In this paper, we model a spatially varying channel where a source is moving along a random trajectory with respect to a fixed re- ceiver. The aim is to compute the power spectral density corre- sponding to the channel impulse response as a function of tem ...

2006