The subjects covered in this volume span a wide range: phase diversity, grey systems, ways of imaging magnetic domains, and image reconstruction.
In the first chapter, L. Mugnier, A. Blanc, and J. Idier describe the technique for wavefront sensing and diffraction-limited imaging based on phase diversity. This has reached a high degree of sophistication in astronomy. Here, the authors give a clear and readable account of current developments.
The second chapter deals with the recovery of information in a difficult domain, in which some essential information is missing or the information available may be misleading. The authors, Y. Lin and S. Liu, have introduced the notion of “grey numbers”, and they explain what these numbers are and how they are manipulated. Their utility in a variety of difficult situations is then shown by example.
The imaging of magnetic domains has preoccupied microscopists for many years and several techniques for observing phenomena in the scanning and transmission electron microscopes have been devised. Newer types of microscopy have now joined the armoury, and W. Szmaja describes recent developments, concentrating on a type of contrast provided by the scanning electron microscope, the Bitter pattern method and magnetic force
microscopy.
Finally, B. Yazici and C.E. Yarman describe a group-theoretic approach to deconvolution for image reconstruction.