Michiharu NIIMI


Improvement of JPEG Compression Efficiency Using Information Hiding and Image Restoration
Kazumi YAMAWAKI Fumiya NAKANO Hideki NODA Michiharu NIIMI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2013/05/01
Vol. E96-D  No. 5  pp. 1233-1237
Type of Manuscript:  LETTER
Category: Image Processing and Video Processing
Keyword: 
information hidingimage compressionimage restorationJPEGcolor image
 Summary | Full Text:PDF(254.7KB)

Text-Independent Speaker Verification Using Artificially Generated GMMs for Cohorts
Yuuji MUKAI Hideki NODA Michiharu NIIMI Takashi OSANAI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2008/10/01
Vol. E91-D  No. 10  pp. 2536-2539
Type of Manuscript:  LETTER
Category: Speech and Hearing
Keyword: 
speaker verificationGaussian mixture modelartificial cohortscore normalizationbackground model
 Summary | Full Text:PDF(77.9KB)

JPEG2000 Steganography which Preserves Histograms of DWT Coefficients
Hideki NODA Yohsuke TSUKAMIZU Michiharu NIIMI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2007/04/01
Vol. E90-D  No. 4  pp. 783-786
Type of Manuscript:  LETTER
Category: Application Information Security
Keyword: 
steganographyJPEG2000information hidinghistogram preservationquantization index modulation
 Summary | Full Text:PDF(154.9KB)

A Method to Apply BPCS-Steganography to Palette-Based Images Using Luminance Quasi-Preserving Color Quantization
Michiharu NIIMI Richard O. EASON Hideki NODA Eiji KAWAGUCHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/09/01
Vol. E85-A  No. 9  pp. 2141-2148
Type of Manuscript:  PAPER
Category: Image
Keyword: 
steganographypalette-based imageBPCS-steganographycolor quantization
 Summary | Full Text:PDF(1.4MB)

A Method of Making Lookup Tables for Hilbert Scans*
Sei-ichiro KAMATA Michiharu NIIMI Eiji KAWAGUCHI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 1996/03/25
Vol. E79-D  No. 3  pp. 249-251
Type of Manuscript:  LETTER
Category: Image Processing,Computer Graphics and Pattern Recognition
Keyword: 
Hilbert curveslookup tablesimage compressionN dimensional space
 Summary | Full Text:PDF(168.9KB)