A Review of “ Microwave Remote Sensing of the Atmosphere”. Edited by A. JANSSEN, (Chichester: Wiley, 1993.) [Pp. 572.] Price £79.

This Letter presents an adapiive contexiual filler, developed by Ihe addition of a heterogeneity rule and a confidence rule to The conventional majority filter. Experiments have been carried out using a Landsat Thematic Mapper (TM) image. Results show that the adaptive majority filter has a capability of reducing the classification errors due to spectrally mixed pixels and preserves The connection of thin features. The proposed filler needs only a moderate increase in processing time compared with the conventional majority filter.     

A review of: “ Advances in Digital Image Processing: Theory,Application, Implementation ”. Edited by P. STUCKI. (New York,London: Plenum Press, 1979.) [Pp. 332.] Price $39·50.

Abstract

Radiometric balancing is a form of radiometric correction that can be applied to radar imagery. However, its application can be based on untenable assumptions about the characteristics of the scene and so can be unreliable. The method of radiometrically balancing an image and the requirements of the technique are outlined along with an example of where its use would be inappropriate. A recommendation is made against policies of pre-dissemination radiometric balancing and it is suggested that users should evaluate the use of other techniques which may be more suitable for their imagery.