| 摘要 |
A band-limited image signal generating unit decomposes an input image signal into a plurality of band-limited image signals, each representing an image having different frequencies. An index value obtaining unit obtains an index value indicating a level of noise suppression based on data representing spatial frequencies as well as an evaluation value representing local contrast at a pixel of interest in band-limited images and data representing an X-ray dose. A noise suppression processing unit performs noise suppression processing on each pixel of each of band-limited images based on the index value. A processed image generating unit obtains a processed image, in which noise has been suppressed, by adding signals obtained by subtracting processed band-limited image signals, of which noise has been suppressed, from the band-limited image signals together, extracting a noise image signal, and subtracting the noise image signal from the input image signal.
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