Analysis on the strip-based projection model for discrete tomography
主 题: Analysis on the strip-based projection model for discrete tomography
报告人: Dr. Jiehua Zhu (Georgia southern University)
时 间: 2007-12-17 下午 4:00 - 5:00
地 点: 理科一号楼 1275
Discrete tomography deals with image reconstruction of an object with a finitely many gray levels (such as two). Different approaches are used to model the raw detector reading. The most popular models are line projection with a lattice of points and strip projection with a lattice of pixels/cells. The line-based projection model fits some applications but involves a major approximation since the x-ray beams of finite widths are simplified as line integrals. The strip-based projection model formulates projection equations according to the fractional areas of the intersection of each strip-shaped beam and the rectangular grid of an image to be reconstructed, so is more realistic in some applications. In this talk we will characterize the strip-based projection model and establish an equivalence between the system matrices generated by the strip-based and line-based projection models. This is a joint work with Prof. Xiezhang Li at Georgia southern University, Prof. Yangbo Ye at University of Iowa, and Prof. Ge Wang at Virginia Polytechnic Institute & State University.