Title :
Frequency scramble for secure communication of images using multidimensional digital filters
Author :
Murakosi, Sho ; Kawamata, Masayuki ; Higuchi, Tatsuo
Author_Institution :
Dept. of Electron. Eng., Tohoku Univ., Sendai, Japan
Abstract :
Multidimensional frequency scramble for secure communication of images using multidimensional linear periodically shift-variant digital filters (LPSV filters) is studied. The notion of a generalized multidimensional transfer function is presented for LPSV filters. The frequency characteristic of the filters is discussed in terms of this transfer function. Two-dimensional LPSV filters are designed based on the one-dimensional Parks-McClellan algorithm. The resultant LPSV filters divide the input spectrum into some components that are permuted and possibly inverted. Experimental results are presented to illustrate the effectiveness of multidimensional frequency scramble using the LPSV filters
Keywords :
image coding; security of data; telecommunications computing; transfer functions; two-dimensional digital filters; videotelephony; visual communication; 2D filters; TV telephone; frequency characteristic; frequency scramble; generalized multidimensional transfer function; linear periodically shift-variant digital filters; multidimensional digital filters; one-dimensional Parks-McClellan algorithm; secure communication of images; Algorithm design and analysis; Cable TV; Digital filters; Facsimile; Finite impulse response filter; Frequency; Multidimensional systems; Nonlinear filters; Telephony; Transfer functions;
Conference_Titel :
Circuits and Systems, 1992., Proceedings of the 35th Midwest Symposium on
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-0510-8
DOI :
10.1109/MWSCAS.1992.271353
