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Title: Estimation of Image Corruption Inverse Function and Image Restoration Using a PSO-based Algorithm
Author(s): M. Pourmahmood, A. M. Shotorbani, R. M. Shotorbani
Pages: 1-5 Paper ID: 1010906-4545-IJVIPNS-IJENS Published: December, 2010
Abstract: In this paper, a new method is proposed to estimate corruption function inverse of a blurred image. This technique can be used for restoring similar corrupted images. For linear position invariant procedure, the corruption process is modeled in the spatial domain by convolving the image with a point spread function (PSF) and addition of some noises into the image. It is assumed that a given artificial image is corrupted by a degradation function, represented by the PSF, and an additive noise. Then a filter mask (as a candidate for the corruption function inverse) is calculated to restore the original image from the corrupted one, with some accuracy. Calculating a suitable filter mask is formulated as an optimization problem: find optimal coefficients of the filter mask such that the difference between the original image and filter mask restored image to be minimized. Particle swarm optimization (PSO) is used to compute the optimal coefficients of the filter mask. Square filter masks are considered. A comparison between different exciting methods and the proposed technique is done using simulations. The simulation results show that the proposed method is effective and efficient. Since the proposed method is a simple linear technique, it can be easily implemented in hardware or software.
Keywords: Corruption function, filter mask, image restoration, particle swarm optimization.
Full Text (.pdf)  International Journals Of Engineering and Science | 394 KB
Title: Degree Elevation of Interval Bezier Curves Using Legendre-Bernstein Basis Transformations
Author(s): O. Ismail
Pages: 6-9 Paper ID: 109306-7676-IJVIPNS-IJENS Published: December, 2010
Abstract: This paper presents a simple matrix form for degree elevation of interval Bezier curve using Legendre-Bernstein basis transformations. The four fixed Kharitonov's polynomials (four fixed Bezier curves) associated with the original interval Bezier curve are obtained. These four fixed Bezier curves are expressed in terms of the Legendre polynomials. The process of degree elevationsrtimes are applied to the four fixed Bezier curves of degreen to obtain the four fixed Bezier curves of degreen+r. The four fixed Bezier curves are transformed to the Bernstein polynomials. Finally the new interval vertices ?{[q_i^-,q_i^+ ]}?_(i=0)^(n+r)of the new interval polygon are obtained from vertices of the new fixed polygons of the four fixed Bezier curves. An illustrative example is included in order to demonstrate the effectiveness of the proposed method.
Keywords: Computer graphics, image processing, CAGD, degree elevation, interval Beziercurves.
Full Text (.pdf)  International Journals Of Engineering and Science | 450 KB