DIGITAL FILTER FOR IMAGE PROCESSING, IMAGE GENERATING APPARATUS, SUPERHYBRID IMAGE GENERATING APPARATUS, IMAGE GENERATING METHOD, DIGITAL FILTER CREATING METHOD, SUPERHYBRID IMAGE GENERATING METHOD, PRINTING MEDIUM MANUFACTURING METHOD, ELECTRONIC MEDIUM MANUFACTURING METHOD, AND PROGRAM, AND LETTER-ROW TILT ILLUSION GENERATING APPARATUS, LETTER-ROW TILT ILLUSION GENERATING METHOD, PRINTING MEDIUM MANUFACTURING METHOD, ELECTRONIC MEDIUM MANUFACTURING METHOD, AND PROGRAM

摘要

In the present invention, subband signals are obtained by performing multiresolution decomposition on image data by using a broad-sense pinwheel framelet that is a set of an approximate filter with no orientation and a plurality of detail filters with respective orientations, and that has a degree. When an image is reconstructed by summing the obtained subband signals, the reconstructed image data is generated by attenuating or amplifying a subband signal corresponding to at least one of filters that have predetermined frequency characteristics and/or a predetermined orientation among the filters.