Image processing device

Abstract

The present invention provides an image processing device capable of performing high-resolution conversion, enlargement processing, etc. which, even with images including both text images and photographic images, satisfies both sharpness of text areas and smoothness of photograph areas. The image processing device according to the present invention performs frequency conversion, using a frequency conversion device, of partial images which are the objects of processing, resulting in a matrix of frequency-converted coefficients; divides into a plurality of domains, using a plurality of patterns, the matrix of frequency-converted coefficients; and quantifies each such domain by finding a mean value of the coefficients of that domain as a feature quantity for that domain. The mean coefficient value of each domain is inputted into a conversion filter selecting device, where a hierarchical neural network calculates and outputs the suitability of each conversion filter for the partial image in question, and the conversion filter selecting device selects the conversion filter with the highest suitability. Then an interpolation processing device performs interpolation processing of each partial image using the conversion filter most suited thereto.

Dependencies are inferred from the claim text.