Patent ID: 7050618
Filing Date: 2006-05-23
Classification: A61B,G06T

Abstract:
1. A method for detecting and attenuating grid artifacts in a digital radiographic image comprising: providing an input digital radiographic image; processing said input digital radiographic image with a detection algorithm based on 2-D dynamic correlation in both spatial and frequency domains to determine whether said input digital radiographic image has grid artifacts; and if it does detecting the grid orientation, frequency, and signal-to-noise ratio of said grid artifacts; designing a frequency bandstop (notch) digital 1-D filter as a function of said grid frequency and attenuation level; and suppressing said grid artifacts by further processing said input digital radiographic image with said designed filter to produce an output digital radiographic image of improved image quality, wherein said processing includes consequent dynamic analyzing image profiles in two dimensions both in spatial and in frequency domains in a predefined square sub-region of the input digital radiographic image (window) in each of horizontal and vertical directions, and wherein said consequent dynamic analyzing includes calculating and analyzing auto-correlation (ACF) and cross-correlation (CCF) functions for 2 image profiles with predefined incremental step in said predefined window.