Keyword : random unitary transform


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 codingsecure computationorthogonal matching pursuit (OMP)random unitary transformEtC system
 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 codingorthogonal matching pursuit (OMP)random unitary transformsecure computationencryption-then-compression (EtC)
 Summary | Full Text:PDF

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 representationdictionary learningrandom unitary transformsecure computation
 Summary | Full Text:PDF