528 research outputs found
An Adaptive Threshold based FPGA Implementation for Object and Face detection
The moving object and face detection are vital requirement for real time security applications. In this paper, we propose an Adaptive Threshold based FPGA Implementation for Object and Face detection. The input Images and reference Images are preprocessed using Gaussian Filter to smoothen the high frequency components. The 2D-DWT is applied on Gaussian filter outputs and only LL bands are considered for further processing. The modified background with adaptive threshold are used to detect the object with LL band of reference image. The detected object is passed through Gaussian filter to enhance the quality of object. The matching unit is designed to recognize face from standard face database images. It is observed that the performance parameters such as percentage TSR and hardware utilizations are better compared to existing techniques
FPGA IMPLEMENTATION OF MOVING OBJECT AND FACE DETECTION USING ADAPTIVE THRESHOLD
The real time moving object and face detections are used for various security applications. In this paper,
we propose FPGA implementation of moving object and face detection with adaptive threshold. The input
images are passed through Gaussian filter. The 2D-DWT is applied on Gaussian filter output and
considered only LL band for further processing to detect object/face. The modified background subtraction
technique is applied on LL bands of input images. The adaptive threshold is computed using LL-band of
reference image and object is detected through modified background subtraction. The detected object is
passed through Gaussian filter to get final good quality object. The face detection is also identified using
matching unit along with object detection unit. The reference image is replaced by face database images in
the face detection. It is observed that the performance parameters such as TSR, FRR, FAR and hardware
related results are improved compared to existing techniques
Implementation of fingerprint based biometric system using optimized 5/3 DWT architecture and modified CORDIC based FFT
The real-time biometric systems are used to authenticate persons for wide range of security applications. In this paper, we propose implementation of fingerprint-based biometric system using Optimized 5/3 DWT architecture and Modified CORDIC-based Fast Fourier Transform (FFT). The Optimized 2D-DWT architecture is designed using Optimized 1D-DWT architectures, Memory Units and novel Controller Unit which is used to scan rows and columns of an image. The database fingerprint image is applied to the proposed Optimized 2D-DWT architecture to obtain four sub-bands of LL, LH, HL and HH. The efficient architecture of FFT is designed by using Modified CORDIC processor which generates twiddle factor angles of range â using Pre-processing Unit and Comparator Block. Further, the LL sub-band coefficients are applied to the Modified CORDIC based FFT to generate final fingerprint
Impact of anesthesia on patient and endoscopist satisfaction after colonoscopy â A pilot study
FPGA implementation of moving object and face detection using adaptive threshold
The real time moving object and face detections are used for various security applications. In this paper,
we propose FPGA implementation of moving object and face detection with adaptive threshold. The input
images are passed through Gaussian filter. The 2D-DWT is applied on Gaussian filter output and
considered only LL band for further processing to detect object/face. The modified background subtraction
technique is applied on LL bands of input images. The adaptive threshold is computed using LL-band of
reference image and object is detected through modified background subtraction. The detected object is
passed through Gaussian filter to get final good quality object. The face detection is also identified using
matching unit along with object detection unit. The reference image is replaced by face database images in
the face detection. It is observed that the performance parameters such as TSR, FRR, FAR and hardware
related results are improved compared to existing techniques
Adjoint bulk scalars and supersymmetric unification in the presence of extra dimensions
There are several advantages of introducing adjoint superfields at
intermediate energies around GeV. Such as (i) gauge couplings still
unify (ii) neutrino masses and mixings are produced (iii) primordial lepton
asymmetry can be produced. We point out that if adjoint scalars have bulk
excitations along with gauge bosons whereas fermions and the doublet scalar
live on boundary then N=2 supersymmetric beta functions vanish.
Thus even if extra dimensions open up at an intermediate scale and all
N=2 Yang-Mills fields as well as N=2 matter fields in the adjoint
representation propagate in the bulk, still gauge couplings renormalize beyond
just like they do in 4-dimensions with adjoint scalars. Consequently
unification is achieved in the presence to extra dimensions, mass scales are
determined uniquely via Renormalization Group Equations(RGE) and unification
scale remains high enough to suppress proton decay. This scenario can be
falsified if we get signatures of extra dimensions at low energy.Comment: New references added. This version will appear in Phys. Rev.
Cosmological bounds on large extra dimensions from non-thermal production of Kaluza-Klein modes
The existing cosmological constraints on theories with large extra dimensions
rely on the thermal production of the Kaluza-Klein modes of gravitons and
radions in the early Universe. Successful inflation and reheating, as well as
baryogenesis, typically requires the existence of a TeV-scale field in the
bulk, most notably the inflaton. The non-thermal production of KK modes with
masses of order 100 GeV accompanying the inflaton decay sets the lower bounds
on the fundamental scale M_*. For a 1 TeV inflaton, the late decay of these
modes distort the successful predictions of Big Bang Nucleosynthesis unless
M_*> 35, 13, 7, 5 and 3 TeV for 2, 3, 4, 5 and 6 extra dimensions,
respectively. This improves the existing bounds from cosmology on M_* for 4, 5
and 6 extra dimensions. Even more stringent bounds are derived for a heavier
inflaton.Comment: 17 pages, latex, 4 figure
Search for lepton-flavor violation at HERA
A search for lepton-flavor-violating interactions and has been performed with the ZEUS detector using the entire HERA I
data sample, corresponding to an integrated luminosity of 130 pb^{-1}. The data
were taken at center-of-mass energies, , of 300 and 318 GeV. No
evidence of lepton-flavor violation was found, and constraints were derived on
leptoquarks (LQs) that could mediate such interactions. For LQ masses below
, limits were set on , where
is the coupling of the LQ to an electron and a
first-generation quark , and is the branching ratio of
the LQ to the final-state lepton ( or ) and a quark . For
LQ masses much larger than , limits were set on the four-fermion
interaction term for LQs that couple to an electron and a quark
and to a lepton and a quark , where and are
quark generation indices. Some of the limits are also applicable to
lepton-flavor-violating processes mediated by squarks in -Parity-violating
supersymmetric models. In some cases, especially when a higher-generation quark
is involved and for the process , the ZEUS limits are the most
stringent to date.Comment: 37 pages, 10 figures, Accepted by EPJC. References and 1 figure (Fig.
6) adde
Multijet production in neutral current deep inelastic scattering at HERA and determination of alpha_s
Multijet production rates in neutral current deep inelastic scattering have
been measured in the range of exchanged boson virtualities 10 < Q2 < 5000 GeV2.
The data were taken at the ep collider HERA with centre-of-mass energy sqrt(s)
= 318 GeV using the ZEUS detector and correspond to an integrated luminosity of
82.2 pb-1. Jets were identified in the Breit frame using the k_T cluster
algorithm in the longitudinally invariant inclusive mode. Measurements of
differential dijet and trijet cross sections are presented as functions of jet
transverse energy E_{T,B}{jet}, pseudorapidity eta_{LAB}{jet} and Q2 with
E_{T,B}{jet} > 5 GeV and -1 < eta_{LAB}{jet} < 2.5. Next-to-leading-order QCD
calculations describe the data well. The value of the strong coupling constant
alpha_s(M_Z), determined from the ratio of the trijet to dijet cross sections,
is alpha_s(M_Z) = 0.1179 pm 0.0013(stat.) {+0.0028}_{-0.0046}(exp.)
{+0.0064}_{-0.0046}(th.)Comment: 22 pages, 5 figure
Measurement of (anti)deuteron and (anti)proton production in DIS at HERA
The first observation of (anti)deuterons in deep inelastic scattering at HERA
has been made with the ZEUS detector at a centre-of-mass energy of 300--318 GeV
using an integrated luminosity of 120 pb-1. The measurement was performed in
the central rapidity region for transverse momentum per unit of mass in the
range 0.3<p_T/M<0.7. The particle rates have been extracted and interpreted in
terms of the coalescence model. The (anti)deuteron production yield is smaller
than the (anti)proton yield by approximately three orders of magnitude,
consistent with the world measurements.Comment: 26 pages, 9 figures, 5 tables, submitted to Nucl. Phys.
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