4,567 research outputs found
Bio-Inspired Stereo Vision Calibration for Dynamic Vision Sensors
Many advances have been made in the eld of computer vision. Several recent research trends
have focused on mimicking human vision by using a stereo vision system. In multi-camera systems, a
calibration process is usually implemented to improve the results accuracy. However, these systems generate
a large amount of data to be processed; therefore, a powerful computer is required and, in many cases,
this cannot be done in real time. Neuromorphic Engineering attempts to create bio-inspired systems that
mimic the information processing that takes place in the human brain. This information is encoded using
pulses (or spikes) and the generated systems are much simpler (in computational operations and resources),
which allows them to perform similar tasks with much lower power consumption, thus these processes
can be developed over specialized hardware with real-time processing. In this work, a bio-inspired stereovision
system is presented, where a calibration mechanism for this system is implemented and evaluated
using several tests. The result is a novel calibration technique for a neuromorphic stereo vision system,
implemented over specialized hardware (FPGA - Field-Programmable Gate Array), which allows obtaining
reduced latencies on hardware implementation for stand-alone systems, and working in real time.Ministerio de Economía y Competitividad TEC2016-77785-PMinisterio de Economía y Competitividad TIN2016-80644-
Live Demonstration: On the distance estimation of moving targets with a Stereo-Vision AER system
Distance calculation is always one of the most
important goals in a digital stereoscopic vision system. In an
AER system this goal is very important too, but it cannot be
calculated as accurately as we would like. This demonstration
shows a first approximation in this field, using a disparity
algorithm between both retinas. The system can make a distance
approach about a moving object, more specifically, a qualitative
estimation. Taking into account the stereo vision system
features, the previous retina positioning and the very important
Hold&Fire building block, we are able to make a correlation
between the spike rate of the disparity and the distance.Ministerio de Ciencia e Innovación TEC2009-10639-C04-0
A FPGA Spike-Based Robot Controlled with Neuro-inspired VITE
This paper presents a spike-based control system applied to a fixed
robotic platform. Our aim is to take a step forward to a future complete spikes
processing architecture, from vision to direct motor actuation. This paper covers
the processing and actuation layer over an anthropomorphic robot. In this way,
the processing layer uses the neuro-inspired VITE algorithm, for reaching a target,
based on PFM taking advantage of spike system information: its frequency.
Thus, all the blocks of the system are based on spikes. Each layer is implemented
within a FPGA board and spikes communication is codified under the
AER protocol. The results show an accurate behavior of the robotic platform
with 6-bit resolution for a 130º range per joint, and an automatic speed control
of the algorithm. Up to 96 motor controllers could be integrated in the same
FPGA, allowing the positioning and object grasping by more complex anthropomorphic
robots.Ministerio de Ciencia e Innovación TEC2009-10639-C04-02Ministerio de Economía y Competitividad TEC2012-37868-C04-0
Tracking and Vertexing with a Thin CMOS Pixel Beam Telescope
We present results of a study of charged particle track and vertex
reconstruction with a beam telescope made of four layers of 50 micron-thin CMOS
monolithic pixel sensors using the 120 GeV protons at the FNAL Meson Test Beam
Facility. We compare our results to the performance requirements of a future
e+e- linear collider in terms of particle track extrapolation and vertex
reconstruction accuracies.Comment: 9 pages, 7 figures submitted to Nuclear Instruments and Methods
Interferometric scattering enables fluorescence-free electrokinetic trapping of single nanoparticles in free solution
Anti-Brownian traps confine single particles in free solution by closed-loop
feedback forces that directly counteract Brownian motion. The extended-duration
measurement of trapped objects allows detailed characterization of
photophysical and transport properties, as well as observation of infrequent or
rare dynamics. However, this approach has been generally limited to particles
that can be tracked by fluorescent emission. Here we present the
Interferometric Scattering Anti-Brownian ELectrokinetic trap (ISABEL trap),
which uses interferometric scattering rather than fluorescence to monitor
particle position. By decoupling the ability to track (and therefore trap) a
particle from collection of its spectroscopic data, the ISABEL trap enables
confinement and extended study of single particles that do not fluoresce, that
only weakly fluoresce, or which exhibit intermittent fluorescence or
photobleaching. This new technique significantly expands the range of nanoscale
objects that may be investigated at the single-particle level in free solution.Comment: Manuscript and SI; videos available upon reques
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