IMAGE DENOISING DEVICE, IMAGE DENOISING METHOD, AND IMAGE DENOISING PROGRAM

摘要

A gradient direction detecting section (12) detects the gradient direction of a pixel value in a region composed of N X N pixels centered on a noticeable pixel. A selection section (13) selects N pixels including the noticeable pixel along a direction perpendicular to the gradient direction as selection pixels. A filter coefficient initializing section (14) initializes the filter coefficient corresponding to each of the selection pixels. A reference value determining section (15) determines a reference value with respect to each of the selection pixels on the basis of the pixel value of the pixel determined by the gradient direction. A filter coefficient correcting section (16) corrects the initial value of the filter coefficient corresponding to each of the selection pixels on the basis of the reference value with respect to each of the selection pixels. A pixel value calculating section (17) calculates the value of an output pixel with respect to the noticeable pixel on the basis of a pixel value with respect to each of the selection pixels and the correction value of each of the filter coefficients.