DIGITAL FILTER FOR IMAGE PROCESSING, IMAGE GENERATION APPARATUS, IMAGE GENERATION METHOD, DIGITAL FILTER CREATION METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a digital filter for image processing capable of providing an FIR (Finite Impulse Response) filter having diversified frequency characteristics and orientation properties as a differentiable function with a compact support without causing discontinuation, and to provide an image generation apparatus, image generation method, digital filter creation method, and a program.SOLUTION: The present invention involves a set that includes an approximate filter having no orientation and a plurality of precision filters, each of which has an orientation. When reconstructing an image by performing multi-resolution decomposition on image data using a broad pinwheel framelet having order, acquiring sub-band signals, and adding the acquired sub-band signals together, reconstructed image data is generated by attenuating or amplifying a sub-band signal corresponding to at least one of the filters, among the plurality of filters, having prescribed frequency characteristics and/or a prescribed orientation.