Title :
Image scrambling using 2-D periodically shift variant filters
Author :
Joo, Kyung Sub ; Bose, Tamal
Author_Institution :
Dept. of Electr. Eng., Colorado Univ., Denver, CO, USA
Abstract :
Two-dimensional (2-D) periodically shift variant (PSV) digital filters are considered for image scrambling applications. The filters are formulated in the form of a difference equation and a Fornasini-Marchesini (FM) state-space model with periodic coefficients. These PSV models are then represented as shift-invariant systems which are named block difference equation and “Kiok-Neon” model respectively. Invertibility of this model is an important consideration, especially in image scrambling applications. A condition is established for the invertibility of the “Kiok-Neon” model of the 2-D PSV system. Also, the inverse system can be easily computed from the original system
Keywords :
filtering theory; image processing; state-space methods; two-dimensional digital filters; 2D periodically shift variant filters; Fornasini-Marchesini state-space model; Kiok-Neon model; block difference equation; difference equation; image scrambling applications; inverse system; model invertibility; periodic coefficients; Delay; Difference equations; Digital filters; Out of order; Two dimensional displays;
Conference_Titel :
Circuits and Systems, 1995., Proceedings., Proceedings of the 38th Midwest Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
0-7803-2972-4
DOI :
10.1109/MWSCAS.1995.504480
