TAILIEUCHUNG - Power: Polar wavelet-gaussian filter for ring artifact suppression in CT imaging systems
In this paper, we propose an efficient, fast, powerful and stable improved hybrid algorithm in the Polar domain for eliminating the ring artifacts. This algorithm provides tight condensation of artifacts and hence preserves all the structure information in the image with reduced computational complexity. The results show that the superiority of new algorithm comparing with the existing techniques. | ISSN:2249-5789 R Jagadeesh Chandra Prasad et al, International Journal of Computer Science & Communication Networks,Vol 1(2), 186-195 PoWer: Polar Wavelet-Gaussian Filter for ring artifact suppression in CT Imaging Systems R. Jagadeesh Chandra Prasad PG student, Sri Vasavi Engineering College, Tadepalligudem, West Godavari dist, Andhra Pradesh, INDIA; (E-mail: rjc007@). T. Sreenivasu in ECE Department, Sri Vasavi Engineering college, Tadepalligudem, West Godavari Dist, Andhra Pradesh, India; (E-mail: sreenivasut@). M. Venu Gopala Rao Professor in ECE Department, Narasaraopet Engineering college, Narasaraopet, Guntur dist, Andhra Pradesh, India; (E-mail: mvgr03@) Abstract In X-ray Computerized Tomography (CT), ring artifacts are caused by imperfect detector elements as well as by defects or impurities on the scintillator crystals. They appear on CT images as a number of dark concentric rings superimposed on the structures being scanned. Posts processing such as noise reduction, binarization, or segmentation of image information are significantly complicated by the presence of such artifacts. In this paper, we propose an efficient, fast, powerful and stable improved hybrid algorithm in the Polar domain for eliminating the ring artifacts. This algorithm provides tight condensation of artifacts and hence preserves all the structure information in the image with reduced computational complexity. The results show that the superiority of new algorithm comparing with the existing techniques. Key words: Ring artifacts, Gaussian filter, Wavelet filter, hybrid filter, tight condensation. 1. Introduction Computerized Tomography images are often superimposed by so called ring artifacts. They appear on CT images as a number of dark concentric rings superimposed on the structures being scanned. There are many causes for the appearance of ring artifacts, but all of them are associated with individual pixel response. In worst case, if .
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