32 research outputs found
Deep MDP: A Modular Framework for Multi-Object Tracking
This paper presents a fast and modular framework for Multi-Object Tracking
(MOT) based on the Markov descision process (MDP) tracking-by-detection
paradigm. It is designed to allow its various functional components to be
replaced by custom-designed alternatives to suit a given application. An
interactive GUI with integrated object detection, segmentation, MOT and
semi-automated labeling is also provided to help make it easier to get started
with this framework. Though not breaking new ground in terms of performance,
Deep MDP has a large code-base that should be useful for the community to try
out new ideas or simply to have an easy-to-use and easy-to-adapt system for any
MOT application. Deep MDP is available at
https://github.com/abhineet123/deep_mdp
Weak Lensing Effect on CMB in the Presence of a Dipole Anisotropy
We investigate weak lensing effect on cosmic microwave background (CMB) in
the presence of dipole anisotropy. The approach of flat-sky approximation is
considered. We determine the functions and that
appear in expressions of the lensed CMB power spectrum in the presence of a
dipole anisotropy. We determine the correction to B-mode power spectrum which
is found to be appreciable at low multipoles (). However, the temperature
and E-mode power spectrum are not altered significantly.Comment: 9 page
Quintessential Inflation in a thawing realization
We study quintessential inflation with an inverse hyperbolic type potential
, where ,
and "n" are parameters of the theory. We obtain a bound on
for different values of the parameter n. The spectral index and the
tensor-to-scalar-ratio fall in the bound given by the Planck 2015
data for for certain values of . However for
there exist values of for which the spectral index and the
tensor-to-scalar-ratio fall only within the bound of the Planck
data. Furthermore, we show that the scalar field with the given potential can
also give rise to late time acceleration if we invoke the coupling to massive
neutrino matter. We also consider the instant preheating mechanism with Yukawa
interaction and put bounds on the coupling constants for our model using the
nucleosynthesis constraint on relic gravity waves produced during inflation.Comment: 11 page
Real-Time Salient Closed Boundary Tracking via Line Segments Perceptual Grouping
This paper presents a novel real-time method for tracking salient closed
boundaries from video image sequences. This method operates on a set of
straight line segments that are produced by line detection. The tracking scheme
is coherently integrated into a perceptual grouping framework in which the
visual tracking problem is tackled by identifying a subset of these line
segments and connecting them sequentially to form a closed boundary with the
largest saliency and a certain similarity to the previous one. Specifically, we
define a new tracking criterion which combines a grouping cost and an area
similarity constraint. The proposed criterion makes the resulting boundary
tracking more robust to local minima. To achieve real-time tracking
performance, we use Delaunay Triangulation to build a graph model with the
detected line segments and then reduce the tracking problem to finding the
optimal cycle in this graph. This is solved by our newly proposed closed
boundary candidates searching algorithm called "Bidirectional Shortest Path
(BDSP)". The efficiency and robustness of the proposed method are tested on
real video sequences as well as during a robot arm pouring experiment.Comment: 7 pages, 8 figures, The 2017 IEEE/RSJ International Conference on
Intelligent Robots and Systems (IROS 2017) submission ID 103
Philanthropy for Impact in West Bengal
The paper highlights West Bengal's development performance vis-a-vis other Indian states in the following focus areas: Education, Health, Nutrition, WASH, Livelihood, Environment and Gender. Apart from examining trends, gaps, assets and intra-state disparities, the paper also provides a glimpse of the solution ecosystem in the state as well as philanthropic funding flows from various quarters including government and CSR
Towards Early Prediction of Human iPSC Reprogramming Success
This paper presents advancements in automated early-stage prediction of the
success of reprogramming human induced pluripotent stem cells (iPSCs) as a
potential source for regenerative cell therapies.The minuscule success rate of
iPSC-reprogramming of around to makes it labor-intensive,
time-consuming, and exorbitantly expensive to generate a stable iPSC line.
Since that requires culturing of millions of cells and intense biological
scrutiny of multiple clones to identify a single optimal clone. The ability to
reliably predict which cells are likely to establish as an optimal iPSC line at
an early stage of pluripotency would therefore be ground-breaking in rendering
this a practical and cost-effective approach to personalized medicine. Temporal
information about changes in cellular appearance over time is crucial for
predicting its future growth outcomes. In order to generate this data, we first
performed continuous time-lapse imaging of iPSCs in culture using an ultra-high
resolution microscope. We then annotated the locations and identities of cells
in late-stage images where reliable manual identification is possible. Next, we
propagated these labels backwards in time using a semi-automated tracking
system to obtain labels for early stages of growth. Finally, we used this data
to train deep neural networks to perform automatic cell segmentation and
classification. Our code and data are available at
https://github.com/abhineet123/ipsc_prediction.Comment: Accepted for publication at the Journal of Machine Learning for
Biomedical Imaging (MELBA) https://melba-journal.org/2023:01