Πλοήγηση ανά Συγγραφέα "Delibasis, K. K."
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Calculation of Complex Zernike Moments with Geodesic Correction for Pose Recognition in Omni-directional Images
Delibasis, K. K.; Georgakopoulos, S.; Plagianakos, V.; Maglogiannis, I. (2014)A number of Computer Vision and Artificial Intelligence applications are based on descriptors that are extracted from imaged objects. One widely used class of such descriptors are the invariant moments, with Zernike moments ... -
A classification system based on a new wrapper feature selection algorithm for the diagnosis of primary and secondary polycythemia
Korfiatis, V. C.; Asvestas, P. A.; Delibasis, K. K.; Matsopoulos, G. K. (2013)Primary and Secondary Polycythemia are diseases of the bone marrow that affect the blood's composition and prohibit patients from becoming blood donors. Since these diseases may become fatal, their early diagnosis is ... -
Enhancing classification accuracy utilizing globules and dots features in digital dermoscopy
Maglogiannis, I.; Delibasis, K. K. (2015)The interest in image dermoscopy has been significantly increased recently and skin lesion images are nowadays routinely acquired for a number of skin disorders. An important finding in the assessment of a skin lesion ... -
Fisheye camera modeling for human segmentation refinement in indoor videos
Delibasis, K. K.; Goudas, T.; Plagianakos, V. P.; Maglogiannis, I. (2013)In this paper, we concentrate on refining the results of segmenting human presence from indoors videos acquired by a fisheye camera, using a 3D mathematical model of the camera. The model has been calibrated according to ... -
A Fourier-based implicit evolution scheme for active surfaces, for object segmentation in volumetric images
Delibasis, K. K.; Tassani, S.; Asvestas, P.; Kechriniotis, A. I.; Matsopoulos, G. K. (2013)Active contours (AC) and active surfaces (AS) have been used extensively for segmentation and measurement in two- and three-dimensional images. The small time steps used in discretizing the evolution equation of AC/AS with ... -
Hermite Kernels for slice interpolation in medical images
Delibasis, K. K.; Kechriniotis, A. I.; Assimakis, N. D.; Tassani, S.; Matsopoulos, G. K. (2012)Univariate Hermite interpolation of the total degree (HTD) is an algebraically demanding interpolation method that utilizes information of the values of the signal to be interpolated at distinct support positions, as well ... -
Human segmentation and pose recognition in fish-eye video for assistive environments
Delibasis, K. K.; Plagianakos, V. P.; Goudas, T.; Maglogiannis, I. (2013)In this work, we present a system, which uses computer vision techniques for human silhouette segmentation from video in indoor environments and a parametric 3D human model, in order to recognize the posture of the monitored ... -
An implicit evolution scheme for active contours and surfaces based on IIR filtering
Delibasis, K. K.; Asvestas, P. A.; Kechriniotis, A. I.; Matsopoulos, G. K. (2014)In this work, we present an approach for implementing an implicit scheme for the numerical solution of the partial differential equation of the evolution of an active contour/surface. The proposed scheme is applicable to ... -
An intelligent tool for anatomical object segmentation using deformable surfaces
Delibasis, K. K.; Christodoulidis, A.; Maglogiannis, I. (2012)Image segmentation is a very active area of research in machine vision. In this work, an innovative methodology is presented that allows the segmentation of objects in three-dimensional images with initial user intervention. ... -
Near real-time human silhouette and movement detection in indoor environments using fixed cameras
Christodoulidis, A.; Delibasis, K. K.; Maglogiannis, I. (2012)The automated human behavior modeling is highly desired in the context of an assistive environment. In this paper, we describe a software video processing and analysis system to assist the near real time detection of human ... -
A new formula for bivariate hermite interpolation on variable step grids and its application to image interpolation
Delibasis, K. K.; Kechriniotis, A. (2014)In this paper, we present a novel formula of the bivariate Hermite interpolating (BHI) polynomial in the case of support points arranged on a grid with variable step. This expression is applicable when interpolation of a ... -
A NEW PARALLEL POLYNOMIAL DIVISION BY A SEPARABLE POLYNOMIAL VIA HERMITE INTERPOLATION WITH APPLICATIONS
Kechriniotis, A. I.; Delibasis, K. K.; Tsonos, C.; Petropoulos, N. (2012)A new parallel division of polynomials by a common separable divisor over a perfect field is presented and this is done by expressing the remainders as derivatives of a unique polynomial. In order to get this results, a ... -
A novel tool for segmenting 3D medical images based on generalized cylinders and active surfaces
Delibasis, K. K.; Kechriniotis, A.; Maglogiannis, I. (2013)Three-dimensional (3D) medical imaging has been incorporated in routine clinical practice, since the required infrastructure has become increasingly affordable. New algorithms and applications are needed to serve the ... -
On centered and compact signal and image derivatives for feature extraction
Delibasis, K. K.; Kechriniotis, A.; Maglogiannis, I. (2013)A great number of Artificial Intelligence applications are based on features extracted from signals or images. Feature extraction often requires differentiation of discrete signals and/or images in one or more dimensions. ... -
On Generalizations of Gruss Inequality in Inner Product Spaces and Applications
Kechriniotis, A. I.; Delibasis, K. K. (2010)Using a Kurepa's result for Gramians, we achieve refinements of well-known generalizations of Gruss inequality in inner product spaces. These results are further applied in L(2)(a, b) to derive improvements of some published ... -
Pose recognition in indoor environments using a fisheye camera and a parametric human model
Delibasis, K. K.; Plagianakos, V. P.; Maglogiannis, I. (2014)In this paper we present a system that uses computer vision techniques and a deformable 3D human model, in order to recognize the posture of a monitored person, given the segmented human silhouette from the background. The ... -
Real time indoor robot localization using a stationary fisheye camera
Delibasis, K. K.; Plagianakos, V. P.; Maglogiannis, I. (2013)A core problem in robotics is the localization of a mobile robot (determination of the location or pose) in its environment, since the robot's behavior depends on its position. In this work, we propose the use of a stationary ... -
Refinement of human silhouette segmentation in omni-directional indoor videos
Delibasis, K. K.; Plagianakos, V. P.; Maglogiannis, I. (2014)In this paper, we present a methodology for refining the segmentation of human silhouettes in indoor videos acquired by fisheye cameras. This methodology is based on a fisheye camera model that employs a spherical optical ... -
Towards the mathematic formalization of parametric generalized cylinders and initial results in modeling 3D image data
Kechriniotis, A. I.; Delibasis, K. K.; Tsonos, C.; Assimakis, N.; Asvestas, P. (2009)Generalized cylinders (GCs) have been proposed in computer vision for object modeling in two dimensional images. However approaches so far have not investigated closed form solutions, based on a formal generic definition ...