ANZIAM  J.  46 (2005), 341-360

A convolution back projection algorithm for local tomography

Challa S. Sastry   Artificial Intelligence Lab   Department of Computer and Information Sciences   University of Hyderabad   Hyderabad 500046   India     s.challa@lycos.com and P. C. Das   Department of Mathematics   Indian Institute of Technology   Kanpur 208016   India     pcdas@iitk.ac.in

Abstract

The present work deals with the problem of recovering a local image from localised projections using the concept of approximation identity. It is based on the observation that the Hilbert transform of an approximation identity taken from a certain class of compactly supported functions with sufficiently many zero moments has no significant spread of support. The associated algorithm uses data pertaining to the local region along with a small amount of data from its vicinity. The main features of the algorithm are simplicity and similarity with standard filtered back projection (FBP) along with the economic use of data.

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