Abstract
AbstractThis paper proposes a new resolution reduction method for halftone images. Recently, smartphone or tablet PC has become widespread. When viewing comics on mobile devices as e-books, image resolution conversion is required, because there are various resolution devices. If comic images are reduced with conventional resolution conversion methods using interpolating functions such as bicubic interpolation, moiré which leads to deterioration in image quality is generated, because comic images include halftones with periodic structures. In this paper, we propose a resolution reduction method for halftone images which preserve periodic structures of original images. Experiments show that a moiré is not generated with our proposed method, and the method is superior in subjective image quality and computational time to the conventional bicubic interpolation.KeywordsResolution conversionhalftonemoiréinterpolating functionbicubicfluency DA functionsbifluency interpolation
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