Jaya, V.L; Dr Gopika Kumari(Cochin University of Science and Technology, May 20, 2015)
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Abstract:
Digital Image Processing is a rapidly evolving eld with growing applications
in Science and Engineering. It involves changing the nature
of an image in order to either improve its pictorial information
for human interpretation or render it more suitable for autonomous
machine perception. One of the major areas of image processing
for human vision applications is image enhancement. The principal
goal of image enhancement is to improve visual quality of an image,
typically by taking advantage of the response of human visual
system.
Image enhancement methods are carried out usually in the pixel
domain. Transform domain methods can often provide another way
to interpret and understand image contents. A suitable transform,
thus selected, should have less computational complexity. Sequency
ordered arrangement of unique MRT (Mapped Real Transform)
coe cients can give rise to an integer-to-integer transform, named
Sequency based unique MRT (SMRT), suitable for image processing
applications. The development of the SMRT from UMRT (Unique
MRT), forward & inverse SMRT algorithms and the basis functions
are introduced. A few properties of the SMRT are explored and its
scope in lossless text compression is presented.
Annes, V H; Dr.Mohan Kumar, K(Cochin University of Science & Technology, June , 2000)
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Abstract:
The aim of the
present study is to understand the characteristics and properties of different wave
modes and the vertical circulation pattern in the troposphere and lower stratosphere
over Indian region using data obtained from the Indian Mesosphere-Stratosphere Troposphere
(MST) radar, National Center for Environmental Prediction/National
Centres of Atmospheric Research (NCEP/NCAR) reanalysed data and radiosonde observations.Studies on the vertical motion in monsoon Hadley circulation are carried out
and the results are discussed . From the analysis of MST radar data, an
overall picture of vertical motion of air over Indian region is explained and noted that
there exists sinking motion both during winter and summer. Besides, the study shows
that there is an anomalous northerly wind in the troposphere over the southern
peninsular region during southwest monsoon season.The outcome of the study on intrusion of mid-latitude upper tropospheric
trough and associated synoptic-scale vertical velocity over the tropical Indian
latitudes are reported and discussed . It shows that there is interaction
between north Indian latitudes and tropical easterly region, when there is an eastward
movement of Western Disturbance across the country. It explains the strengthening of
westerlies and a change of winter westerlies into easterlies in the tropical troposphere
and lower stratosphere. The divergence field computed over the MST radar station
shows intensification in the downward motion in association with the synoptic
systems of the northwest Indian region.
Description:
Department of Atmospheric Sciences,
Cochin University of Science and Technology