22 May 2002 Higher resolution method for color digital images
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It is necessary to predict unknown higher-frequency components which are lost by sampling for enlarging digital images. Based on Laplacian pyramid representation, the prediction of unknown higher-frequency components is equivalent to the prediction of an unknown high-resolution Laplacian image. We have proposed the higher resolution method based on the Laplacian pyramid representation. However, the overshooting and undershooting are appeared near the step-edge regions of the higher resolution result. Particularly, these overshooting and undershooting of the color digital images are standed out as shifting color components and we call this artifact the edge effect. In this paper, we propose a new color image higher resolution method with the (epsilon) -filtering, in order to reduce the edge effect. Excellent higher resolution color images without edge effect are obtained by the proposed method.
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Yasumasa Takahashi, Yasumasa Takahashi, Atsushi Shimura, Atsushi Shimura, Akira Taguchi, Akira Taguchi, "Higher resolution method for color digital images", Proc. SPIE 4667, Image Processing: Algorithms and Systems, (22 May 2002); doi: 10.1117/12.467987; https://doi.org/10.1117/12.467987

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