10,902 research outputs found
Towards a Scalable Hardware/Software Co-Design Platform for Real-time Pedestrian Tracking Based on a ZYNQ-7000 Device
Currently, most designers face a daunting task to
research different design flows and learn the intricacies of
specific software from various manufacturers in
hardware/software co-design. An urgent need of creating a
scalable hardware/software co-design platform has become a key
strategic element for developing hardware/software integrated
systems. In this paper, we propose a new design flow for building
a scalable co-design platform on FPGA-based system-on-chip.
We employ an integrated approach to implement a histogram
oriented gradients (HOG) and a support vector machine (SVM)
classification on a programmable device for pedestrian tracking.
Not only was hardware resource analysis reported, but the
precision and success rates of pedestrian tracking on nine open
access image data sets are also analysed. Finally, our proposed
design flow can be used for any real-time image processingrelated
products on programmable ZYNQ-based embedded
systems, which benefits from a reduced design time and provide a
scalable solution for embedded image processing products
Implementing and Characterizing Real-time Broadband RFI Excision for the GMRT Wideband Backend
The Giant Metrewave Radio Telescope (GMRT) is being upgraded to increase the
receiver sensitivity. This makes the receiver more susceptible to man-made
Radio Frequency Interference (RFI). To improve the receiver performance in
presence of RFI, real-time RFI excision (filtering) is incorporated in the GMRT
wideband backend (GWB). The RFI filtering system is implemented on FPGA and
CPU-GPU platforms to detect and remove broadband and narrowband RFI. The RFI is
detected using a threshold-based technique where the threshold is computed
using Median Absolute Deviation (MAD) estimator. The filtering is carried out
by replacing the RFI samples by either noise samples or constant value or
threshold. This paper describes the status of the real-time broadband RFI
excision system in the wideband receiver chain of the upgraded GMRT (uGMRT).
The test methodology for carrying out various tests to demonstrate the
performance of broadband RFI excision at the system level and on radio
astronomical imaging experiments are also described.Comment: 7 pages, 7 figure
Canadian Hydrogen Intensity Mapping Experiment (CHIME) Pathfinder
A pathfinder version of CHIME (the Canadian Hydrogen Intensity Mapping
Experiment) is currently being commissioned at the Dominion Radio Astrophysical
Observatory (DRAO) in Penticton, BC. The instrument is a hybrid cylindrical
interferometer designed to measure the large scale neutral hydrogen power
spectrum across the redshift range 0.8 to 2.5. The power spectrum will be used
to measure the baryon acoustic oscillation (BAO) scale across this poorly
probed redshift range where dark energy becomes a significant contributor to
the evolution of the Universe. The instrument revives the cylinder design in
radio astronomy with a wide field survey as a primary goal. Modern low-noise
amplifiers and digital processing remove the necessity for the analog
beamforming that characterized previous designs. The Pathfinder consists of two
cylinders 37\,m long by 20\,m wide oriented north-south for a total collecting
area of 1,500 square meters. The cylinders are stationary with no moving parts,
and form a transit instrument with an instantaneous field of view of
100\,degrees by 1-2\,degrees. Each CHIME Pathfinder cylinder has a
feedline with 64 dual polarization feeds placed every 30\,cm which
Nyquist sample the north-south sky over much of the frequency band. The signals
from each dual-polarization feed are independently amplified, filtered to
400-800\,MHz, and directly sampled at 800\,MSps using 8 bits. The correlator is
an FX design, where the Fourier transform channelization is performed in FPGAs,
which are interfaced to a set of GPUs that compute the correlation matrix. The
CHIME Pathfinder is a 1/10th scale prototype version of CHIME and is designed
to detect the BAO feature and constrain the distance-redshift relation.Comment: 20 pages, 12 figures. submitted to Proc. SPIE, Astronomical
Telescopes + Instrumentation (2014
FPGA implementation of a 32x32 autocorrelator array for analysis of fast image series
With the evolving technology in CMOS integration, new classes of 2D-imaging
detectors have recently become available. In particular, single photon
avalanche diode (SPAD) arrays allow detection of single photons at high
acquisition rates (\geq 100 kfps), which is about two orders of magnitude
higher than with currently available cameras. Here we demonstrate the use of a
SPAD array for imaging fluorescence correlation spectroscopy (imFCS), a tool to
create 2D maps of the dynamics of fluorescent molecules inside living cells.
Time-dependent fluorescence fluctuations, due to fluorophores entering and
leaving the observed pixels, are evaluated by means of autocorrelation
analysis. The multi-{\tau} correlation algorithm is an appropriate choice, as
it does not rely on the full data set to be held in memory. Thus, this
algorithm can be efficiently implemented in custom logic. We describe a new
implementation for massively parallel multi-{\tau} correlation hardware. Our
current implementation can calculate 1024 correlation functions at a resolution
of 10{\mu}s in real-time and therefore correlate real-time image streams from
high speed single photon cameras with thousands of pixels.Comment: 10 pages, 7 figure
MOSAIC: A Scalable reconfigurable 2D array system for NDT
This paper documents the development of a scalable 2D array system, or Mosaic that can be targeted at a wide range of NDT applications by way of a reconfigurable tile that can be tessellated to form arrays of any size and shape. Close coupling permits utilization of excitation voltages as low as +/-3.3V with insertion loss of 48dB on reflection from an aluminum back wall at 73mm achieved using 2D arrays without decoding
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