Masahiro IWAHASHI


Two-Layer Lossless Coding for High Dynamic Range Images Based on Range Compression and Adaptive Inverse Tone-Mapping
Taichi YOSHIDA Masahiro IWAHASHI Hitoshi KIYA 
Publication:   
Publication Date: 2018/01/01
Vol. E101-A  No. 1  pp. 259-266
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
HDR image coding2-layer codinglossless codingarbitrary tone-mapping
 Summary | Full Text:PDF(2.1MB)

An Remapping Operation without Tone Mapping Parameters for HDR Images
Yuma KINOSHITA Sayaka SHIOTA Masahiro IWAHASHI Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/11/01
Vol. E99-A  No. 11  pp. 1955-1961
Type of Manuscript:  Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)
Category: Image
Keyword: 
HDR imagetone mappinginverse tone mapping
 Summary | Full Text:PDF(3.2MB)

Channel Scaling for Integer Implementation of Minimum Lifting 2D Wavelet Transform
Teerapong ORACHON Taichi YOSHIDA Somchart CHOKCHAITAM Masahiro IWAHASHI Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/07/01
Vol. E99-A  No. 7  pp. 1420-1429
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
wavelettransformimagecodinglifting
 Summary | Full Text:PDF(1.2MB)

Adaptive Directional Lifting Structure of Three Dimensional Non-Separable Discrete Wavelet Transform for High Resolution Volumetric Data Compression
Fairoza Amira BINTI HAMZAH Taichi YOSHIDA Masahiro IWAHASHI Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/05/01
Vol. E99-A  No. 5  pp. 892-899
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
adaptive directional liftingdiscrete wavelet transformlossless codingthree dimensional non-separable lifting structure
 Summary | Full Text:PDF(1.2MB)

A Unified Tone Mapping Operation for HDR Images Expressed in Integer Data
Toshiyuki DOBASHI Masahiro IWAHASHI Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/03/01
Vol. E99-A  No. 3  pp. 774-776
Type of Manuscript:  LETTER
Category: Image
Keyword: 
high dynamic rangetone mappinginteger
 Summary | Full Text:PDF(204.1KB)

A Fixed-Point Global Tone Mapping Operation for HDR Images in the RGBE Format
Toshiyuki DOBASHI Tatsuya MUROFUSHI Masahiro IWAHASHI Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/11/01
Vol. E97-A  No. 11  pp. 2147-2153
Type of Manuscript:  Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)
Category: 
Keyword: 
tone mappinghigh dynamic rangefixed-pointfloating-pointlow-memory
 Summary | Full Text:PDF(1.5MB)

An Efficient Lossless Compression Method Using Histogram Packing for HDR Images in OpenEXR Format
Taku ODAKA Wannida SAE-TANG Masaaki FUJIYOSHI Hiroyuki KOBAYASHI Masahiro IWAHASHI Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/11/01
Vol. E97-A  No. 11  pp. 2181-2183
Type of Manuscript:  Special Section LETTER (Special Section on Smart Multimedia & Communication Systems)
Category: 
Keyword: 
index transformationcodingsparse histogramPIZZIP
 Summary | Full Text:PDF(740.7KB)

Reduction of Lifting Steps of Non Separable 2D Quadruple Lifting DWT Compatible with Separable 2D DWT
Suvit POOMRITTIGUL Masahiro IWAHASHI Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/07/01
Vol. E97-A  No. 7  pp. 1492-1499
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
waveletimagecodingliftingseparable
 Summary | Full Text:PDF(1.7MB)

Reversible 2D 9-7 DWT Based on Non-separable 2D Lifting Structure Compatible with Irreversible DWT
Masahiro IWAHASHI Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/10/01
Vol. E94-A  No. 10  pp. 1928-1936
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
losslessimagewaveletcodingcompatible
 Summary | Full Text:PDF(2.1MB)

Methods for Avoiding the Checkerboard Distortion Caused by Finite Word Length Error in Multirate System
Hiroaki IWAI Masahiro IWAHASHI Hitoshi KIYA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/03/01
Vol. E93-A  No. 3  pp. 631-635
Type of Manuscript:  LETTER
Category: Digital Signal Processing
Keyword: 
checkerboard distortionmultirate systemfinite word length errorcascade structure
 Summary | Full Text:PDF(229.2KB)

Functionally Layered Video Coding for Water Level Monitoring
Sakol UDOMSIRI Masahiro IWAHASHI Shogo MURAMATSU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/04/01
Vol. E91-A  No. 4  pp. 1006-1014
Type of Manuscript:  Special Section PAPER (Special Section on Selected Papers from the 20th Workshop on Circuits and Systems in Karuizawa)
Category: 
Keyword: 
waterrecognitionvideocodingscalable
 Summary | Full Text:PDF(2.6MB)

A New Unified Lossless/Lossy Image Compression Based on a New Integer DCT
Somchart CHOKCHAITAM Masahiro IWAHASHI Somchai JITAPUNKUL 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2005/07/01
Vol. E88-D  No. 7  pp. 1598-1606
Type of Manuscript:  Special Section PAPER (Special Section on Recent Advances in Circuits and Systems--Part 1)
Category: Image Processing and Multimedia Systems
Keyword: 
Integer-DCTlosslesslossyimage compressionrounding operationrounding effect
 Summary | Full Text:PDF(1.3MB)

Performance Evaluation of Lossless/Lossy Wavelets for Image Compression under Lossless/Lossy Coding Criterion
Somchart CHOKCHAITAM Masahiro IWAHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/08/01
Vol. E85-A  No. 8  pp. 1882-1891
Type of Manuscript:  Special Section LETTER (Special Section on Digital Signal Processing)
Category: Image/Visual Signal Processing
Keyword: 
losslesslossywaveletcoding gain
 Summary | Full Text:PDF(2.6MB)

A Bit-Rate Adaptive Coding System Based on Lossless DCT
Somchart CHOKCHAITAM Masahiro IWAHASHI Pavol ZAVARSKY Noriyoshi KAMBAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/02/01
Vol. E85-A  No. 2  pp. 403-413
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
lossless DCT (L-DCT)codinglossylosslessnear-losslessadaptive
 Summary | Full Text:PDF(1.5MB)

An Unwrapping of Signals in Transform Domain and Its Application in Signal Reconstruction
Pavol ZAVARSKY Nobuo FUJII Noriyoshi KAMBAYASHI Masahiro IWAHASHI Somchart CHOKCHAITAM 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/07/01
Vol. E84-A  No. 7  pp. 1765-1771
Type of Manuscript:  PAPER
Category: Image
Keyword: 
image compressionsignal reconstructionperfect reconstruction filter bank
 Summary | Full Text:PDF(782.5KB)

Integrated Lossy and Lossless Image Coding Based on Lossless Wavelet Transform and Lossy-Lossless Multi-Channel Prediction
Somchart CHOKCHAITAM Masahiro IWAHASHI Pavol ZAVARSKY Noriyoshi KAMBAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/05/01
Vol. E84-A  No. 5  pp. 1326-1338
Type of Manuscript:  PAPER
Category: Image
Keyword: 
imagecodinglosslesslossyfilter bank
 Summary | Full Text:PDF(3.1MB)

Lossless Scalable Coding of Images via Lossless Multi-Channel Prediction
Masahiro IWAHASHI Somchart CHOKCHAITAM Narong BUABTHONG Pavol ZAVARSKY Noriyoshi KAMBAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/07/25
Vol. E83-A  No. 7  pp. 1450-1457
Type of Manuscript:  PAPER
Category: Image
Keyword: 
losslesscodingwaveletJPEG
 Summary | Full Text:PDF(3.3MB)

A Reassignment Method for Improved Readability of Time-Frequency Representations
Pavol ZAVARSKY Nobuo FUJII Masahiro IWAHASHI Noriyoshi KAMBAYASHI Shinji FUKUMA Takeshi MYOKEN 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/07/25
Vol. E83-A  No. 7  pp. 1473-1478
Type of Manuscript:  LETTER
Category: Analog Signal Processing
Keyword: 
signal analysistime-frequency representationreassignment method
 Summary | Full Text:PDF(342.6KB)

A Multi-Unitary Decomposition of Discrete-Time Signals in Signal Analysis
Pavol ZAVARSKY Takeshi MYOKEN Noriyoshi KAMBAYASHI Shinji FUKUMA Masahiro IWAHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/01/25
Vol. E83-A  No. 1  pp. 109-120
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
signal processingmulti-unitary decompositionmulti-unitary decimated filter bank
 Summary | Full Text:PDF(1.2MB)

Realization of Universal Active Complex Filter Using CCIIs and CFCCIIs
Xiaoxing ZHANG Xiayu NI Masahiro IWAHASHI Noriyoshi KAMBAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/02/25
Vol. E81-A  No. 2  pp. 244-251
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit Techniques in the Digital-Oriented Era)
Category: 
Keyword: 
active filtercurrent conveyorcurrent followercomplex filtersensitivity
 Summary | Full Text:PDF(599.6KB)

Implementaion of Active Complex Filter with Variable Parameter Using OTAs
Xiaoxing ZHANG Xiayu NI Masahiro IWAHASHI Noriyoshi KAMBAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/09/25
Vol. E80-A  No. 9  pp. 1721-1724
Type of Manuscript:  LETTER
Category: Analog Signal Processing
Keyword: 
active filteroperational transconductance amplifieranalog complex filter
 Summary | Full Text:PDF(243.7KB)

A Novel Narrow-Band Bandpass Filter and Its Application to SSB Communication
Xiaoxing ZHANG Masahiro IWAHASHI Noriyoshi KAMBAYASHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1997/07/25
Vol. E80-C  No. 7  pp. 1010-1015
Type of Manuscript:  Special Section PAPER (Special Issue on New Concept Device and Novel Architecture LSIs)
Category: Neural Networks and Chips
Keyword: 
complex analog filterbandpass filteranalytic signalphase shiftsingle sideband (SSB) communication
 Summary | Full Text:PDF(471.5KB)

A Motion Compensation Technique for Down-Scaled Pictures in Layered Coding
Masahiro IWAHASHI Wataru KAMEYAMA Koichi OHYAMA Noriyoshi KAMBAYASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1994/08/25
Vol. E77-B  No. 8  pp. 1007-1012
Type of Manuscript:  PAPER
Category: Signaling System and Communication Protocol
Keyword: 
codingdriftmotion compensationscalingpicture
 Summary | Full Text:PDF(478.7KB)

A Linear Phase Two-Channel Filter Bank Allowing Perfect Reconstruction
Hitoshi KIYA Mitsuo YAE Masahiro IWAHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1993/04/25
Vol. E76-A  No. 4  pp. 620-625
Type of Manuscript:  PAPER
Category: Linear and Nonlinear Digital Filters
Keyword: 
digital filtermultirate digital signal processingfilter bandsubband coding
 Summary | Full Text:PDF(360.2KB)