Takayuki NAKACHI

A Privacy-Preserving Machine Learning Scheme Using EtC Images
Ayana KAWAMURA Yuma KINOSHITA Takayuki NAKACHI Sayaka SHIOTA Hitoshi KIYA 
Publication:   
Publication Date: 2020/12/01
Vol. E103-A  No. 12  pp. 1571-1578
Type of Manuscript:  Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)
Category: Cryptography and Information Security
Keyword: 
support vector machine, random forests, machine learning, encryption-then-compression, privacy-preserving, 
 Summary | Full Text:PDF
L0 Norm Optimization in Scrambled Sparse Representation Domain and Its Application to EtC System
Takayuki NAKACHI Hitoshi KIYA 
Publication:   
Publication Date: 2020/12/01
Vol. E103-A  No. 12  pp. 1589-1598
Type of Manuscript:  Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)
Category: Cryptography and Information Security
Keyword: 
sparse coding, secure computation, orthogonal matching pursuit (OMP), random unitary transform, EtC system, 
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An MMT-Based Hierarchical Transmission Module for 4K/120fps Temporally Scalable Video
Yasuhiro MOCHIDA Takayuki NAKACHI Takahiro YAMAGUCHI 
Publication:   
Publication Date: 2020/10/01
Vol. E103-D  No. 10  pp. 2059-2066
Type of Manuscript:  Special Section PAPER (Special Section on Picture Coding and Image Media Processing)
Category: 
Keyword: 
MPEG Media Transport (MMT), high frame rate (HFR), temporally scalable coding, hierarchical transmission, 
 Summary | Full Text:PDF
Secure OMP Computation Maintaining Sparse Representations and Its Application to EtC Systems
Takayuki NAKACHI Hitoshi KIYA 
Publication:   
Publication Date: 2020/09/01
Vol. E103-D  No. 9  pp. 1988-1997
Type of Manuscript:  PAPER
Category: Image Processing and Video Processing
Keyword: 
sparse coding, orthogonal matching pursuit (OMP), random unitary transform, secure computation, encryption-then-compression (EtC), 
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Secure Overcomplete Dictionary Learning for Sparse Representation
Takayuki NAKACHI Yukihiro BANDOH Hitoshi KIYA 
Publication:   
Publication Date: 2020/01/01
Vol. E103-D  No. 1  pp. 50-58
Type of Manuscript:  Special Section PAPER (Special Section on Enriched Multimedia — Application of Multimedia Technology and Its Security —)
Category: 
Keyword: 
sparse representation, dictionary learning, random unitary transform, secure computation, 
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Privacy-Preserving Support Vector Machine Computing Using Random Unitary Transformation
Takahiro MAEKAWA Ayana KAWAMURA Takayuki NAKACHI Hitoshi KIYA 
Publication:   
Publication Date: 2019/12/01
Vol. E102-A  No. 12  pp. 1849-1855
Type of Manuscript:  Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)
Category: Image
Keyword: 
support vector machine, privacy-preserving, random unitary transformation, 
 Summary | Full Text:PDF
FOREWORD
Takayuki NAKACHI Makoto NAKASHIZUKA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/11/01
Vol. E99-A  No. 11  pp. 1907-1908
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF
Layered Multicast Encryption of Motion JPEG2000 Code Streams for Flexible Access Control
Takayuki NAKACHI Kan TOYOSHIMA Yoshihide TONOMURA Tatsuya FUJII 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2012/05/01
Vol. E95-D  No. 5  pp. 1301-1312
Type of Manuscript:  Special Section PAPER (Special Section on Recent Advances in Multimedia Signal Processing Techniques and Applications)
Category: Video Processing
Keyword: 
layered multicast, broadcast encryption, Motion JPEG2000, 
 Summary | Full Text:PDF
Parallel Processing of Distributed Video Coding to Reduce Decoding Time
Yoshihide TONOMURA Takayuki NAKACHI Tatsuya FUJII Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/10/01
Vol. E92-A  No. 10  pp. 2463-2470
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Image Coding and Processing
Keyword: 
distributed video coding, LDPC codes, parallelization system, bitplane correlation, Gray code, 
 Summary | Full Text:PDF
Layered Low-Density Generator Matrix Codes for Super High Definition Scalable Video Coding System
Yoshihide TONOMURA Daisuke SHIRAI Takayuki NAKACHI Tatsuya FUJII Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/03/01
Vol. E92-A  No. 3  pp. 798-807
Type of Manuscript:  Special Section PAPER (Special Section on Latest Advances in Fundamental Theories of Signal Processing)
Category: 
Keyword: 
LDPC codes, LDGM codes, layered coding, scalable video coding, JPEG 2000, multicast streaming, real time streaming, super high definition movies, 
 Summary | Full Text:PDF
Distributed Video Coding Using JPEG 2000 Coding Scheme
Yoshihide TONOMURA Takayuki NAKACHI Tetsuro FUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/03/01
Vol. E90-A  No. 3  pp. 581-589
Type of Manuscript:  Special Section PAPER (Special Section on Multimedia and Mobile Signal Processing)
Category: Image
Keyword: 
Distributed Video Coding, JPEG 2000, wavelet transform, LDPC, mobile camera, sensor network, 
 Summary | Full Text:PDF
A Study on Non-octave Scalable Image Coding and Its Performance Evaluation Using Digital Cinema Test Material
Takayuki NAKACHI Tomoko SAWABE Junji SUZUKI Tetsuro FUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/09/01
Vol. E89-A  No. 9  pp. 2405-2414
Type of Manuscript:  PAPER
Category: Image
Keyword: 
image coding, wavelet transform, JPEG2000, resolution conversion, digital cinema, super high definition images, 
 Summary | Full Text:PDF
Extended Multiresolution Lossless Video Coding Using In-Band Spatio-Temporal Prediction
Takayuki NAKACHI Tomoko SAWABE Tetsuro FUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/03/01
Vol. E89-A  No. 3  pp. 698-707
Type of Manuscript:  Special Section PAPER (Special Section on Multidimensional Signal Processing and Its Application)
Category: Image/Vision Processing
Keyword: 
lossless compression, video coding, wavelet transform, prediction coding, progressive transmission, super high definition images, 
 Summary | Full Text:PDF
Multiresolution Lossless Video Coding Using Inter/Intra Frame Adaptive Prediction
Takayuki NAKACHI Tomoko SAWABE Tatsuya FUJII Tetsurou FUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/08/01
Vol. E85-A  No. 8  pp. 1822-1830
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: Image/Visual Signal Processing
Keyword: 
lossless compression, video coding, wavelet transform, prediction coding, digital cinema, 
 Summary | Full Text:PDF
Lossless and Near-Lossless Color Image Coding Using Edge Adaptive Quantization
Takayuki NAKACHI Tatsuya FUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/04/01
Vol. E84-A  No. 4  pp. 1064-1073
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
lossless compression, near-lossless compression, still color images, color transform, super high definition images, 
 Summary | Full Text:PDF
A Unified Coding Algorithm of Lossless and Near-Lossless Color Image Compression
Takayuki NAKACHI Tatsuya FUJII Junji SUZUKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/02/25
Vol. E83-A  No. 2  pp. 301-310
Type of Manuscript:  Special Section PAPER (Special Section on Intelligent Signal and Image Processing)
Category: 
Keyword: 
lossless compression, near-lossless compression, still color images, color transform, super high definition images, 
 Summary | Full Text:PDF
Pel Adaptive Predictive Coding Based on Image Segmentation for Lossless Compression
Takayuki NAKACHI Tatsuya FUJII Junji SUZUKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/06/25
Vol. E82-A  No. 6  pp. 1037-1046
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
lossless coding, predictive coding, super high definition images, image segmentation, 
 Summary | Full Text:PDF
Two Types of Adaptive Beamformer Using 2-D Joint Process Lattice Estimator
Tateo YAMAOKA Takayuki NAKACHI Nozomu HAMADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/01/25
Vol. E81-A  No. 1  pp. 117-122
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
2-D adaptive beamforming, lattice filter, array signal processing, linearly constrained minimum variance, generalized sidelobe canceler, 
 Summary | Full Text:PDF
Two-Dimensional Least Squares Lattice Algorithm for Linear Prediction
Takayuki NAKACHI Katsumi YAMASHITA Nozomu HAMADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/11/25
Vol. E80-A  No. 11  pp. 2325-2329
Type of Manuscript:  LETTER
Category: Digital Signal Processing
Keyword: 
lattice filter, 2-D signal processing, adaptive filter, texture analysis, 
 Summary | Full Text:PDF
Block Estimation Method for Two-Dimensional Adaptive Lattice Filter
InHwan KIM Takayuki NAKACHI Nozomu HAMADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/04/25
Vol. E80-A  No. 4  pp. 737-744
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
block estimation, lattice filter, 2-D signal processing, adaptive algorithm, 
 Summary | Full Text:PDF
A 2-D Adaptive Joint-Process Lattice Estimator for Image Restoration
Takayuki NAKACHI Katsumi YAMASHITA Nozomu HAMADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/01/25
Vol. E80-A  No. 1  pp. 140-147
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
lattice filter, 2-D signal processing, adaptive filter, image processing, 
 Summary | Full Text:PDF
An Extended Lattice Model of Two-Dimensional Autoregressive Fields
Takayuki NAKACHI Katsumi YAMASHITA Nozomu HAMADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/11/25
Vol. E79-A  No. 11  pp. 1862-1869
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
lattice filter, linear prediction, AR modeling, 2-D signal processing, 
 Summary | Full Text:PDF
2-D Adaptive Autoregressive Modeling Using New Lattice Structure
Takayuki NAKACHI Katsumi YAMASHITA Nozomu HAMADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/08/25
Vol. E79-A  No. 8  pp. 1145-1150
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: 
Keyword: 
lattice filter, 2-D signal processing, adaptive filter, linear prediction, AR modeling, 
 Summary | Full Text:PDF
A Design Method of an Adaptive Multichannel IIR Lattice Predictor for k-Step Ahead Prediction
Katsumi YAMASHITA M. H. KAHAI Takayuki NAKACHI Hayao MIYAGI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1993/08/25
Vol. E76-A  No. 8  pp. 1350-1352
Type of Manuscript:  LETTER
Category: Adaptive Signal Processing
Keyword: 
adaptive lattice fulters, multichannel algorithms, predictors, IIR filters, 
 Summary | Full Text:PDF