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Cell Phones as Imaging Sensors

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Colouring the near infrared

Sabine Süsstrunk

Current digital camera sensors are inherently sensitive to the near-infrared part of the spectrum. To prevent the near-IR contamination of images, an IR blocking filter (hot mirror) is placed in front of the sensor. In this work, we start by replacing the ...

2008

Semiconductor Image Sensing

Peter Seitz, Nicolas Blanc

Silicon is an excellent detector material for electromagnetic radiation in the wavelength range of 0.1 to 1000 nm. In the visible spectral range (400-700 nm), external quantum efficiencies approaching 100% are obtained. When combined with the amazing minia ...

Springer2008

Smart camera with embedded co-processor: a postal sorting application

Marco Mattavelli, Romuald Mosqueron, Julien Dubois

This work describes an image acquisition and processing system based on a new co-processor architecture designed for CMOS sensor imaging. The platform permits to configure a wide variety of acquisition modes (random region acquisition, variable image size, ...

2008

Services surround you: Physical-virtual linkage with contextual bookmarks

Xavier Righetti

Our daily life is pervaded by digital information and devices, not least the common mobile phone. However, a seamless connection between our physical world, such as a movie trailer on a screen in the main rail station and its digital counterparts, such as ...

2008

Discovering Human Routines from Cell Phone Data with Topic Models

Daniel Gatica-Perez, Katayoun Farrahi

We present a framework to automatically discover people's routines from information extracted by cell phones. The framework is built from a probabilistic topic model learned on novel bag type representations of activity-related cues (location, proximity an ...

2008

Discovering Human Routines from Cell Phone Data with Topic Models

Daniel Gatica-Perez, Katayoun Farrahi

IDIAP2008

An Enhanced Service Provider Communication Interface with Client Priorization

Milos Stanisavljevic, Slobodan Lukovic

With the increased dynamics of modern life, the efficiency and reliability of everyday services is emerging to be a fundamental concern. On the other hand, modern telecommunication technologies, like wireless Internet access, are penetrating all segments o ...

IEEE/WFM2008

Autonomous multisensor tracking surveillance system

Remo Heimgartner

In the world of video especially in video processing important steps are being taken at this time. Research projects around the world are tackling all kind of tracking problems and segmentation of video images. Others are doing feature extraction, image en ...

EPFL2006

Virtual Sensor Design

Sabine Süsstrunk, Roberto Costantini

We present a virtual digital camera sensor, whose aim is to simulate a real (physical) image capturing sensor.To accomplish this task, the virtual sensor operates in two steps. First, it accepts a physical description of agiven scene and simulates the enti ...

2004

SOWER: Self-Organizing Wireless Network for Messaging

Jean-Pierre Hubaux, Mark Felegyhazi, Srdan Capkun

Short Message Service (SMS) has become extremely popular in many countries, and represents a multi-billion dollars market. Yet many consumers consider that the price charged by the cellular network operators is too high. In this paper, we explain that ther ...

2004