A Code-reduction Technique for SOM-based Image Enlargement Employing Fuzzy Inference

Abstract

We propose a new image enlargement method employing a codebook-based fuzzy interpolation technique in order to realize simultaneous smoothing and sharpening in image enlargement. In the proposed method, codebooks are generated by using self-organizing maps (SOM). The codes of the generated codebooks are used to determine parameters of Gaussian membership functions in the fuzzy IF-THEN rules. Then, enlargement is achieved by a fuzzy inference. Experimental results of the proposed method show superior performances than other typical image enlargement methods. Calculation time is reduced drastically in comparison with the previous codebook-based method which has been proposed by the authors.