Image Analysis, Classification and Change Detection in Remote Sensing, 3rd Edition

4

Filters, K ernels an d Fields

This chapter is somewha t of a catch-all, intended mainly to consolidate and

extend material presented in the preceding chapters and to help lay the foun-

dation for the rest of the book. In Sections 4.1 and 4.2, building on the

discrete Fourier transform introduced in Chapter 3, the concept of discrete

convolution is introduced and filtering, both in the spatial and in the fre-

quency domain, is discussed. Frequent reference to filtering will be made in

Chapter 5 when we trea t enhancement and geometric and radiometric correc-

tion of multisp ectral and SAR imagery. In Section 4.3 it is shown that the

discrete wavelet