User profiles for Christophoros Nikou

Christophoros Nikou

Professor of Computer Science and Engineering, University of Ioannina, Greece
Verified email at cs.uoi.gr
Cited by 5034

A class-adaptive spatially variant mixture model for image segmentation

C Nikou, NP Galatsanos… - IEEE Transactions on …, 2007 - ieeexplore.ieee.org
We propose a new approach for image segmentation based on a hierarchical and spatially
variant mixture model. According to this model, the pixel labels are random variables and a …

A review of human activity recognition methods

M Vrigkas, C Nikou, IA Kakadiaris - Frontiers in Robotics and AI, 2015 - frontiersin.org
Recognizing human activities from video sequences or still images is a challenging task
due to problems, such as background clutter, partial occlusion, changes in scale, viewpoint, …

Information theory-based shot cut/fade detection and video summarization

Z Cernekova, I Pitas, C Nikou - IEEE Transactions on circuits …, 2005 - ieeexplore.ieee.org
New methods for detecting shot boundaries in video sequences and for extracting key frames
using metrics based on information theory are proposed. The method for shot boundary …

Heartbeat time series classification with support vector machines

A Kampouraki, G Manis, C Nikou - IEEE transactions on …, 2008 - ieeexplore.ieee.org
In this study, heartbeat time series are classified using support vector machines (SVMs).
Statistical methods and signal analysis techniques are used to extract features from the signals. …

Automated detection of cell nuclei in pap smear images using morphological reconstruction and clustering

ME Plissiti, C Nikou… - IEEE Transactions on …, 2010 - ieeexplore.ieee.org
In this paper, we present a fully automated method for cell nuclei detection in Pap smear
images. The locations of the candidate nuclei centroids in the image are detected with …

A Bayesian framework for image segmentation with spatially varying mixtures

C Nikou, AC Likas… - IEEE Transactions on …, 2010 - ieeexplore.ieee.org
A new Bayesian model is proposed for image segmentation based upon Gaussian mixture
models (GMM) with spatial smoothness constraints. This model exploits the Dirichlet …

Sipakmed: A new dataset for feature and image based classification of normal and pathological cervical cells in pap smear images

…, P Dimitrakopoulos, G Sfikas, C Nikou… - 2018 25th IEEE …, 2018 - ieeexplore.ieee.org
Classification of cervical cells in Pap smear images is a challenging task due to the limitations
these images exhibit and the complexity of the morphological changes in the structural …

A survey of document image word spotting techniques

AP Giotis, G Sfikas, B Gatos, C Nikou - Pattern Recognition, 2017 - Elsevier
Vast collections of documents available in image format need to be indexed for information
retrieval purposes. In this framework, word spotting is an alternative solution to optical …

Combining shape, texture and intensity features for cell nuclei extraction in Pap smear images

ME Plissiti, C Nikou, A Charchanti - Pattern Recognition Letters, 2011 - Elsevier
In this work, we present an automated method for the detection and boundary determination
of cells nuclei in conventional Pap stained cervical smear images. The detection of the …

Overlapping cell nuclei segmentation using a spatially adaptive active physical model

ME Plissiti, C Nikou - IEEE Transactions on Image Processing, 2012 - ieeexplore.ieee.org
A method for the segmentation of overlapping nuclei is presented, which combines local
characteristics of the nuclei boundary and a priori knowledge about the expected shape of the …