No Yoon Kwak , Byong Won Hwang

The Transactions of the Korea Information Processing Society (1994 ~ 2000), Vol. 7, No. 4, pp. 1305-1315, Apr. 2000
10.3745/KIPSTE.2000.7.4.1305,   PDF Download:

Abstract

It is known that a digital image enlargement technique can increase the size of the image but the practical enhancement of resolution is trifle because the frequency bandwidth of the original image is basically limited. To solve this problem, this paper proposes the digital image enlargement technique which interpolates the interpolation points of honzontal and vertical direction by weighting according to the direction of edge information with the component of FOI(Filst Order Interpolation) and output of the pseudornedian hiter for image enlargement and interpolates the interpolation points of diagonal direction by selectiveIy transposing the direction of the subwindows of the pseudornedian inter accordding to the distribution of neighbored pixels thereto in the extanded image. Accordding to the proposed metheds, the digital image enlargement which preserves the characteristic of the pseudornedian filter capable of keeping the reconstruction of edge information and ref1ects the advantage of FOI can be performed. Therefore, visual artifacts could be effectively suppressed, and most characteristics and shapes of the original image call be reconstructed as well.

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