Recovering and CAD/CAM Processing of Complex Surfaces. - Mariofanna G. Milanova; I. A. Aleksandrov; Roumen Kountchev (ECAI, 1992)

Fast Image Transfer with Adaptive Multi-Layer Image Compression. - Mariofanna G. Milanova; Charles Ford 001; Roumen Kountchev; Roumiana Kountcheva (FSKD, 2002)

Inverse pyramidal decomposition with multiple DCT. - Roumen Kountchev; Véronique Haese-Coat; Joseph Ronsin (Signal Process. Image Commun., 2002)

Multimedia Watermarking with Complex Hadamard Transform in the Inverse Pyramid Decomposition. - Roumen Kountchev; Mariofanna G. Milanova; Charles Ford 001; Stuart Harvey Rubin (IRI, 2003)

Digital Watermarking for Medical Images. - Mariofanna G. Milanova; Charles Ford 001; Roumen Kountchev; Roumiana Kountcheva (METMBS, 2003)

Lossless Image Compression with IDP and Adaptive RLC. - Roumen Kountchev; Mariofanna G. Milanova; Charles Ford 001; Stuart Harvey Rubin; Roumiana Kountcheva (CISST, 2004)

Audio Watermarking Based On Inverse Difference Decomposition. - Roumen Kountchev; Mariofanna G. Milanova; Charles Ford 001; Stuart Harvey Rubin; Roumiana Kountcheva (IRI, 2004)

Multi-layer Image Transmission with Inverse Pyramidal Decomposition. - Roumen Kountchev; Mariofanna G. Milanova; Charles Ford 001; Roumiana Kountcheva (Computational Intelligence for Modelling and Prediction, 2005)

Contrast enhancement with histogram-adaptive image segmentation. - Stuart Harvey Rubin; Roumen Kountchev; Vladimir Todorov; Roumiana Kountcheva (IRI, 2006)

Enhancement of the Visual Quality of Scanned Documents. - Roumen Kountchev; Mariofanna G. Milanova; Vladimir Todorov; Roumiana Kountcheva (IRI, 2007)

Image Multi-Layer Search Based on Spectrum Pyramid. - Roumen Kountchev; Stuart Harvey Rubin; Mariofanna G. Milanova; Vladimir Todorov (IRI, 2007)

Image Decomposition on the basis of an Inverse Pyramid with 3-layer Neural Networks. - Valeriy Cherkashyn; Roumen Kountchev; Dong-Chen He (SCSS (1), 2008)

Combined visual attention model for video sequences. - Mariofanna G. Milanova; Stuart Harvey Rubin; Roumen Kountchev; Vladimir Todorov; Roumiana Kountcheva (ICPR, 2008)

Extraction of objects contours for body language study. - Roumen Kountchev; Stuart Harvey Rubin; Mariofanna G. Milanova; Vladimir Todorov; Roumiana Kountcheva (IRI, 2008)

Image Representation with Reduced Spectrum Pyramid. - Roumen Kountchev; Roumiana Kountcheva (New Directions in Intelligent Interactive Multimedia, 2008)

Content Based Image Retrieval Using Adaptive Inverse Pyramid Representation. - Mariofanna G. Milanova; Roumen Kountchev; Stuart Harvey Rubin; Vladimir Todorov; Roumiana Kountcheva (HCI (9), 2009)

Intra-frame Compression of Video Sequences with Inverse Difference Pyramid Decomposition. - Roumen Kountchev; Stuart Harvey Rubin; Mariofanna G. Milanova; Vladimir Todorov; Roumiana Kountcheva (IRI, 2009)

Efficient archiving of documents with protection of their authentic content. - Roumen Kountchev; Vladimir Todorov; Roumiana Kountcheva (Int. J. Reason. based Intell. Syst., 2009)

Resistant image watermarking in the phases of the Complex Hadamard Transform coefficients. - Roumen Kountchev; Stuart Harvey Rubin; Mariofanna G. Milanova; Vladimir Todorov; Roumiana Kountcheva (IRI, 2010)

Compression of Multispectral Images with Inverse Pyramid Decomposition. - Roumen Kountchev; Kazumi Nakamatsu (KES (3), 2010)

Introduction to Intelligent Elevator Control Based on EVALPSN. - Kazumi Nakamatsu; Jair Minoro Abe; Seiki Akama; Roumen Kountchev (KES (3), 2010)

Object and Scene Recognition Using Color Descriptors and Adaptive Color KLT. - Volkan H. Bagci; Mariofanna G. Milanova; Roumen Kountchev; Roumiana Kountcheva; Vladimir Todorov (HCI (12), 2011)

Invariant object description with inverse pyramid based on the truncated modified discrete Mellin-Fourier transform. - Roumen Kountchev; Stuart Harvey Rubin; Mariofanna G. Milanova; Roumiana Kountcheva (IRI, 2011)

Automatic detection of welding defects. - Roumen Kountchev; Stuart H. Rubin; Vladimir Todorov; Roumiana Kountcheva (Int. J. Reason. based Intell. Syst., 2011)

Compression of multispectral and multi-view images with inverse pyramid decomposition. - Roumen Kountchev; Vladimir Todorov; Roumiana Kountcheva (Int. J. Reason. based Intell. Syst., 2011)

Intelligent processing and analysis of groups of multispectral images. - Stuart Harvey Rubin; Roumen Kountchev; Mariofanna G. Milanova; Roumiana Kountcheva (IRI, 2012)

One Approach for Grayscale Image Decorrelation with Adaptive Multi-level 2D KLT. - Roumen Kountchev; Kazumi Nakamatsu (KES, 2012)

Multispectral Image Compression, Intelligent Analysis, and Hierarchical Search in Image Databases. - Stuart Harvey Rubin; Roumen Kountchev; Mariofanna G. Milanova; Roumiana Kountcheva (Int. J. Multim. Data Eng. Manag., 2012)

Complex Hadamard transform of digital signals: properties and applications. - Rumen P. Mironov; Roumen Kountchev (Int. J. Reason. based Intell. Syst., 2012)

Comparison of the structure and the computational complexity of the inverse difference and Laplacian Pyramids for still image decomposition. - Roumen Kountchev; Mariofanna G. Milanova; Stuart Harvey Rubin; Roumiana Kountcheva (IRI, 2013)

Hierarchical principal component analysis-based transformation of multispectral images. - Petar N. Ivanov; Roumen Kountchev (Int. J. Reason. based Intell. Syst., 2013)

Medical Images Transform by Multistage PCA-Based Algorithm. - Ivo R. Draganov; Roumen Kountchev; Veska M. Georgieva (Advances in Intelligent Analysis of Medical Data and Decision Support Systems, 2013)

An Adaptive Enhancement of X-Ray Images. - Veska M. Georgieva; Roumen Kountchev; Ivo R. Draganov (Advances in Intelligent Analysis of Medical Data and Decision Support Systems, 2013)

Decorrelation of Sequences of Medical CT Images Based on the Hierarchical Adaptive KLT. - Roumen Kountchev; Peter Ivanov (Advances in Intelligent Analysis of Medical Data and Decision Support Systems, 2013)

Compression with Adaptive Speckle Suppression for Ultrasound Medical Images. - Roumen Kountchev; Vladimir Todorov; Roumiana Kountcheva (Advances in Intelligent Analysis of Medical Data and Decision Support Systems, 2013)

Architecture for Medical Image Processing. - Rumen P. Mironov; Roumen Kountchev (Advances in Intelligent Analysis of Medical Data and Decision Support Systems, 2013)

Adaptive multi-level 2D Karhunen-Loeve-based transform for still images. - Roumen Kountchev; Kazumi Nakamatsu (Int. J. Reason. based Intell. Syst., 2014)

Compression of CT Images with Branched Inverse Pyramidal Decomposition. - Ivo R. Draganov; Roumen Kountchev; Veska M. Georgieva (Advanced Intelligent Computational Technologies and Decision Support Systems, 2014)

An Adaptive Approach for Noise Reduction in Sequences of CT Images. - Veska M. Georgieva; Roumen Kountchev; Ivo R. Draganov (Advanced Intelligent Computational Technologies and Decision Support Systems, 2014)

New Format for Coding of Single and Sequences of Medical Images. - Roumen Kountchev; Vladimir Todorov; Roumiana Kountcheva (Advanced Intelligent Computational Technologies and Decision Support Systems, 2014)

Content protection and hierarchical access control in image databases. - Roumen Kountchev; Mariofanna G. Milanova; Roumiana Kountcheva (INISTA, 2015)

Comparison of Image Decompositions Through Inverse Difference and Laplacian Pyramids. - Roumen Kountchev; Stuart H. Rubin; Mariofanna G. Milanova; Roumiana Kountcheva (Int. J. Multim. Data Eng. Manag., 2015)

Hierarchical SVD-based image decomposition with tree structure. - Roumen K. Kountchev; Roumiana A. Kountcheva (Int. J. Reason. based Intell. Syst., 2015)

Face Recognition in Home Security System Using Tensor Decomposition Based on Radix-(2 × 2) Hierarchical SVD. - Roumen Kountchev; Suzan Anwar; Roumiana Kountcheva; Mariofanna G. Milanova (MPRSS, 2016)

Tissue Segmentation Methods Using 2D Histogram Matching in a Sequence of MR Brain Images. - Vladimir Kanchev; Roumen Kountchev (New Approaches in Intelligent Image Analysis, 2016)

New Approaches for Hierarchical Image Decomposition, Based on IDP, SVD, PCA and KPCA. - Roumen Kountchev; Roumiana Kountcheva (New Approaches in Intelligent Image Analysis, 2016)

ExtrIntDetect - A New Universal Method for the Identification of Intelligent Cooperative Multiagent Systems with Extreme Intelligence. - László Barna Iantovics; Roumen Kountchev; Gloria Cerasela Crisan (Symmetry, 2019)

Hierarchical Cubical Tensor Decomposition through Low Complexity Orthogonal Transforms. - Roumen K. Kountchev; Rumen P. Mironov; Roumiana A. Kountcheva (Symmetry, 2020)

Complexity Estimation of Cubical Tensor Represented through 3D Frequency-Ordered Hierarchical KLT. - Roumen Kountchev; Rumen P. Mironov; Roumiana Kountcheva (Symmetry, 2020)

Hierarchical third-order tensor decomposition through inverse difference pyramid based on the three-dimensional Walsh-Hadamard transform with applications in data mining. - Roumen K. Kountchev; Barna László Iantovics; Roumiana A. Kountcheva (WIREs Data Mining Knowl. Discov., 2020)

Decorrelation of a Sequence of Color Images Through Hierarchical Adaptive Color KLT. - Roumen Kountchev; Roumiana Kountcheva (KES-IDT, 2022)

A Method for Local Contrast Enhancement of Endoscopic Images Based on Color Tensor Transformation into a Matrix of Color Vectors' Modules Using a Sliding Window. - Roumen Kountchev; Alexander Bekiarski; Rumen P. Mironov; Snezhana Pleshkova (Symmetry, 2022)

Third-Order Tensor Decorrelation Based on 3D FO-HKLT with Adaptive Directional Vectorization. - Roumen K. Kountchev; Rumen P. Mironov; Roumiana A. Kountcheva (Symmetry, 2022)

MLTSP: New 3D Framework, Based on the Multilayer Tensor Spectrum Pyramid. - Roumiana A. Kountcheva; Rumen P. Mironov; Roumen K. Kountchev (Symmetry, 2022)

Analysis of the Recursive Locally-Adaptive Filtration of 3D Tensor Images. - Roumen Kountchev; Rumen P. Mironov; Roumiana Kountcheva (Symmetry, 2023)