Anais do IX SIBGRAPI'96 (1996), 197-204
The Use of MAP Estimation Techniques in the Tomographic Reconstruction of Poisson Noise Corrupted Images
Nelson Delfino d'Ávila Mascarenhas, Saulo Savio Leite Santos e Paulo Estevao Cruvinel
UFSCar/DC,
UFSCar/DC,
EMBRAPA/CNPDIA
nelsonm@power.ufscar.br
- Abstract:
-
This work presents new methods for the tomographic
reconstruction of images with Poisson noise corrupted projections. The
reconstruction method is performed by first filtering the noisy
projections under the Maximum a Posteriori criterion and subsequently
reconstructing the images through conventional filtering-backprojection
methods using the ramp filter. The " a priori" knowledge is
incorporated by using several densities, including the Gaussian and
densities defined on the non-negative real line. These densities were
used to denote the fact that the rates of counting on the projections
are non-negative quantities. Experimental results, both simulated and
real, indicate that, by using the MAP criterion, it is possible to
obtain better performance, as compared to conventional methods of
reconstruction, with a very small increase in computational effort.
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