Atanas Gotchev - Academia.edu (original) (raw)
Papers by Atanas Gotchev
Publication in the conference proceedings of Deep Learning and Geometry, Kos island, Greece, 2017
Bookmarks Related papers MentionsView impact
2015 11th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2015
Bookmarks Related papers MentionsView impact
Image Processing: Algorithms and Systems XIII, 2015
Bookmarks Related papers MentionsView impact
Proceedings of the 9th International Conference on Computer Systems and Technologies and Workshop for PhD Students in Computing - CompSysTech '08, 2008
... 17, No. 11, pp. 1568-1586, 2007. [5] E. İmre, S. Knorr, B. Özkalaycı, U. Topay, A. Alatan, T.... more ... 17, No. 11, pp. 1568-1586, 2007. [5] E. İmre, S. Knorr, B. Özkalaycı, U. Topay, A. Alatan, T. Sikora, Towards 3-D Scene Reconstruction from Broadcast Video, Signal Processing: Image Communication 22, pp 108-126, 2007. ...
Bookmarks Related papers MentionsView impact
2014 3DTV-Conference: The True Vision - Capture, Transmission and Display of 3D Video (3DTV-CON), 2014
ABSTRACT A plenoptic camera consists of microlenses that enable the measuring of directional info... more ABSTRACT A plenoptic camera consists of microlenses that enable the measuring of directional information. A common image formation model of the plenoptic camera is based on geometrical optics and provides an object reconstruction with a resolution equal to the number of microlenses. We use a more accurate model that takes into account the wave properties of light. A discrete formulation of this model is done in order to develop the inverse imaging technique which is efficient for super resolution object reconstruction even from noisy data. The proposed algorithm is based on a special modification of the IDD-BM3D deblurring algorithm. The achieved resolution highly exceeds the number of microlenses which is what we call super resolution imaging. Simulations show that the proposed strategy essentially outperforms the previously suggested method based on the wavefield modeling.
Bookmarks Related papers MentionsView impact
2000 10th European Signal Processing Conference, Sep 1, 2000
Bookmarks Related papers MentionsView impact
Proceedings 2003 International Conference on Image Processing, Oct 17, 2003
ABSTRACT This paper introduces an image,decimation technique based on the use of a ,near least-sq... more ABSTRACT This paper introduces an image,decimation technique based on the use of a ,near least-squares criterion that makes ,a proper compromise,between ,the L2 and ,l2 norm ,minimization ,cases. The theory of orthogonal,projections is related to the derivation ofa,computationally ,efficient decimation ,structure possessing good anti-aliasing properties. It is shown,how,this structure can berealized,by the ,transposed Farrow structure when ,using piece-wise polynomial basis
Bookmarks Related papers MentionsView impact
2011 19th European Signal Processing Conference, Aug 1, 2011
ABSTRACT 3D video is expected to provide an enhanced user experience bringing more realism throug... more ABSTRACT 3D video is expected to provide an enhanced user experience bringing more realism through depth impression. Therefore, quality assessment plays an important role when designing and optimizing 3D video processing methods and applications. In this ...
Bookmarks Related papers MentionsView impact
Proceedings of the 3rd Workshop, Oct 25, 2010
ABSTRACT Depth of a three-dimensional scene is perceived using sev-eral different visual cues. Th... more ABSTRACT Depth of a three-dimensional scene is perceived using sev-eral different visual cues. The process of perceiving depth is delicate and vulnerable to artefacts. On autostereoscopic displays the aim is to enhance the sensation of reality of the experience by the added ...
Bookmarks Related papers MentionsView impact
2000 10th European Signal Processing Conference, Sep 1, 2000
ABSTRACT A two-stage algorithm for suppression of electromyogram (EMG) artifacts from the electro... more ABSTRACT A two-stage algorithm for suppression of electromyogram (EMG) artifacts from the electrocardiogram (ECG) using Wavelet Domain Wiener Filtering has been investigated. An improvement of the traditional technique is proposed by involving Time-frequency ...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
2014 Ieee International Conference on Image Processing, Oct 1, 2014
Bookmarks Related papers MentionsView impact
Proceedings Icip International Conference on Image Processing, Oct 1, 2006
In this paper we propose a computationally efficient method for image super-resolution reconstruc... more In this paper we propose a computationally efficient method for image super-resolution reconstruction. We concentrate on pure translational motion and shift-invariant blur. This is the case of interlaced sampling where each low resolution image is uniformly sampled but the overall sampling is non- uniform with respect to the high resolution grid. The reconstruction problem is considered in a multi-resolution framework using separable B-spline wavelets as basis. This allows performing the reconstruction on a uniform higher resolution grid by digital filtering. A computationally efficient structure - the transposed modified Farrow structure is used to achieve a near least squares solution without using any matrix inversions or iterations. The reconstruction can also be performed at non-dyadic scales. Our method minimizes the aliasing distortions and gives results comparable with other least squares techniques. Index Terms— Super-resolution, interlaced sampling, near least squares resampling, Transposed Farrow structure.
Bookmarks Related papers MentionsView impact
ABSTRACT The paper discusses the issues of shift variance and cyclostationarity in multirate filt... more ABSTRACT The paper discusses the issues of shift variance and cyclostationarity in multirate filterbanks as investigated in a series of articles by Til Aach. In its first part, the paper overviews the most important properties of multirate filterbanks such as perfect reconstruction, sampling rate conversion factors, number and type of subbands and subdivisions, orthogonality and bio-orthogonality, and frequency selectivity and preservation of polynomials. This part in intended introduce the reader to the topic and make a bridge to the properties of shift variance and cyclostationarity discussed next. Criteria for shift (in)variance and cyclostationarity as derived by Til Aach are presented and commented and conclusions about their importance are made.
Bookmarks Related papers MentionsView impact
Signal Processing Iet, Jun 1, 2011
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ABSTRACT
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Publication in the conference proceedings of Deep Learning and Geometry, Kos island, Greece, 2017
Bookmarks Related papers MentionsView impact
2015 11th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2015
Bookmarks Related papers MentionsView impact
Image Processing: Algorithms and Systems XIII, 2015
Bookmarks Related papers MentionsView impact
Proceedings of the 9th International Conference on Computer Systems and Technologies and Workshop for PhD Students in Computing - CompSysTech '08, 2008
... 17, No. 11, pp. 1568-1586, 2007. [5] E. İmre, S. Knorr, B. Özkalaycı, U. Topay, A. Alatan, T.... more ... 17, No. 11, pp. 1568-1586, 2007. [5] E. İmre, S. Knorr, B. Özkalaycı, U. Topay, A. Alatan, T. Sikora, Towards 3-D Scene Reconstruction from Broadcast Video, Signal Processing: Image Communication 22, pp 108-126, 2007. ...
Bookmarks Related papers MentionsView impact
2014 3DTV-Conference: The True Vision - Capture, Transmission and Display of 3D Video (3DTV-CON), 2014
ABSTRACT A plenoptic camera consists of microlenses that enable the measuring of directional info... more ABSTRACT A plenoptic camera consists of microlenses that enable the measuring of directional information. A common image formation model of the plenoptic camera is based on geometrical optics and provides an object reconstruction with a resolution equal to the number of microlenses. We use a more accurate model that takes into account the wave properties of light. A discrete formulation of this model is done in order to develop the inverse imaging technique which is efficient for super resolution object reconstruction even from noisy data. The proposed algorithm is based on a special modification of the IDD-BM3D deblurring algorithm. The achieved resolution highly exceeds the number of microlenses which is what we call super resolution imaging. Simulations show that the proposed strategy essentially outperforms the previously suggested method based on the wavefield modeling.
Bookmarks Related papers MentionsView impact
2000 10th European Signal Processing Conference, Sep 1, 2000
Bookmarks Related papers MentionsView impact
Proceedings 2003 International Conference on Image Processing, Oct 17, 2003
ABSTRACT This paper introduces an image,decimation technique based on the use of a ,near least-sq... more ABSTRACT This paper introduces an image,decimation technique based on the use of a ,near least-squares criterion that makes ,a proper compromise,between ,the L2 and ,l2 norm ,minimization ,cases. The theory of orthogonal,projections is related to the derivation ofa,computationally ,efficient decimation ,structure possessing good anti-aliasing properties. It is shown,how,this structure can berealized,by the ,transposed Farrow structure when ,using piece-wise polynomial basis
Bookmarks Related papers MentionsView impact
2011 19th European Signal Processing Conference, Aug 1, 2011
ABSTRACT 3D video is expected to provide an enhanced user experience bringing more realism throug... more ABSTRACT 3D video is expected to provide an enhanced user experience bringing more realism through depth impression. Therefore, quality assessment plays an important role when designing and optimizing 3D video processing methods and applications. In this ...
Bookmarks Related papers MentionsView impact
Proceedings of the 3rd Workshop, Oct 25, 2010
ABSTRACT Depth of a three-dimensional scene is perceived using sev-eral different visual cues. Th... more ABSTRACT Depth of a three-dimensional scene is perceived using sev-eral different visual cues. The process of perceiving depth is delicate and vulnerable to artefacts. On autostereoscopic displays the aim is to enhance the sensation of reality of the experience by the added ...
Bookmarks Related papers MentionsView impact
2000 10th European Signal Processing Conference, Sep 1, 2000
ABSTRACT A two-stage algorithm for suppression of electromyogram (EMG) artifacts from the electro... more ABSTRACT A two-stage algorithm for suppression of electromyogram (EMG) artifacts from the electrocardiogram (ECG) using Wavelet Domain Wiener Filtering has been investigated. An improvement of the traditional technique is proposed by involving Time-frequency ...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
2014 Ieee International Conference on Image Processing, Oct 1, 2014
Bookmarks Related papers MentionsView impact
Proceedings Icip International Conference on Image Processing, Oct 1, 2006
In this paper we propose a computationally efficient method for image super-resolution reconstruc... more In this paper we propose a computationally efficient method for image super-resolution reconstruction. We concentrate on pure translational motion and shift-invariant blur. This is the case of interlaced sampling where each low resolution image is uniformly sampled but the overall sampling is non- uniform with respect to the high resolution grid. The reconstruction problem is considered in a multi-resolution framework using separable B-spline wavelets as basis. This allows performing the reconstruction on a uniform higher resolution grid by digital filtering. A computationally efficient structure - the transposed modified Farrow structure is used to achieve a near least squares solution without using any matrix inversions or iterations. The reconstruction can also be performed at non-dyadic scales. Our method minimizes the aliasing distortions and gives results comparable with other least squares techniques. Index Terms— Super-resolution, interlaced sampling, near least squares resampling, Transposed Farrow structure.
Bookmarks Related papers MentionsView impact
ABSTRACT The paper discusses the issues of shift variance and cyclostationarity in multirate filt... more ABSTRACT The paper discusses the issues of shift variance and cyclostationarity in multirate filterbanks as investigated in a series of articles by Til Aach. In its first part, the paper overviews the most important properties of multirate filterbanks such as perfect reconstruction, sampling rate conversion factors, number and type of subbands and subdivisions, orthogonality and bio-orthogonality, and frequency selectivity and preservation of polynomials. This part in intended introduce the reader to the topic and make a bridge to the properties of shift variance and cyclostationarity discussed next. Criteria for shift (in)variance and cyclostationarity as derived by Til Aach are presented and commented and conclusions about their importance are made.
Bookmarks Related papers MentionsView impact
Signal Processing Iet, Jun 1, 2011
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ABSTRACT
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact