Optimization approach with edge-preserving regularization to time domain ID inverse scattering

Yoshida, H Tanaka, T Takenaka, T

H. Yoshida et al., Optimization approach with edge-preserving regularization to time domain ID inverse scattering, ELEC C JP 2, 84(10), 2001, pp. 1-8

14

INGLESE

Article

Eletrical & Eletronics Engineeing

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS

8756-663X → ACNP

84

10

2001

1 - 8

ISI

8756-663X(2001)84:10<1:OAWERT>2.0.ZU;2-L

The electromagnetic inverse scattering problems are in general ill-conditio ned, so that image reconstruction becomes unstable when noise exists or whe n the number of unknown parameters is increased. Usually, regularization is required. However, when regularization is applied, the high-frequency comp onents in the reconstructed image are suppressed and the reconstruction of the edges becomes difficult. Hence, the concept of edge preservation has be en proposed, by which the smoothly varying parts are made smoother and the sharply varying parts sharper. The effectiveness of this concept has been c onfirmed by analysis in the frequency domain. In this paper, the concept of edge preservation is introduced into the analysis in the time domain. The effect of edge preservation is discussed. As numerical examples, estimation results are presented for the medium constants in a lossless dielectric sl ab and a lossy dielectric slab, The effectiveness of the method is confirme d. (C) 2001 Scripta Technica.