Advances in Imaging and Electron Physics, Volume 111

Four of the the five contributions to this volume, some of which form short monographs on their topic, cover various aspects of image character, image manipulation and computer vision while the fifth is a detailed study of the Schottky electron emitter.

We begin with a presentation of number-theoretic transforms and their utility in image processing by S. Boussakta and A.G.J. Holt. Both the basic theory and some account of the appropriate hardware are included, which makes this a self-contained study of an interesting area.

The second contribution, by M.J. Fransen, T.L. van Rooy, P.C. Tiemeijer, M.H.F. Overwijk, J.S. Faber amd P. Kruit, provides much new information about a surprisingly little studied type of electron source,

Next, we have a study by L. Alvarez, Y. Gousseau and J.-M. Morel of scaling phenomena and image statistics, which provides a readable account of material that has hitherto been scattered over numerous publications.

We then turn to a problem that has arisen recently in magnetic resonance imaging, where image acquisition is accelerated by replacing the traditional cartesian grid by more complicated patterns such as spirals or rosettes. How are the resulting data to be exploited? G.E. Sarty opens his chapter with a general introduction that will enable non-specialists to understand the nature of the problem and its practical importance.

The volume concludes with a short contribution by S. Tari on computer vision based on the edge-strength function. The relation between the human visual system and perception and the information gathered by a machine is examined and several ways of identifying shape and edges are examined.