IMAGE PROCESSING PROGRAM, IMAGE PROCESSING METHOD AND IMAGE PROCESSOR
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United States of America Patent
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Issued Date -
Nov 11, 2010
app pub date -
Aug 6, 2008
filing date -
Oct 15, 2007
priority date (Note) -
Abandoned
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Abstract
An image processing apparatus includes: a cutoff frequency table storing information on a relation between a parameter related to a radial intensity distribution of two-dimensional frequency components of a projection image and a Butterworth filter cutoff frequency to be applied to the projection image concerned; a projection image data input unit for inputting projection image data; an FFT unit for applying a two-dimensional Fourier transform to the projection image to obtain a spatial frequency of the projection image; a radial intensity distribution calculation unit for calculating a radial intensity distribution of frequency components of the projection image; a cutoff frequency setting unit for setting a cutoff frequency corresponding to a parameter related to the radial intensity distribution determined for the projection image, with reference to the cutoff frequency table; and a Butterworth filter for filtering the projection image data with the set cutoff frequency.
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