Patent ID: 8289421

Claim:
An image-signal processing device comprising: an area dividing unit that divides image signals into a plurality of areas based on color information; and a plurality of noise reducing units which perform noise reduction processing by using different methods for individual ones of the plurality of areas of the image signals divided by the area dividing unit, wherein one of the plurality of noise reducing units is respectively selected for each of the plurality of areas, and the noise reduction processing for a given area is performed by using the respective selected noise reducing unit therefor, and wherein each of the noise reducing units includes: a block-signal extracting unit that extracts block signals centered around a pixel of interest and having a predetermined size from the image signals; a representative-value calculating unit that determines a representative value of the pixel of interest of the block signals based on the extracted block signals; a noise-level detecting unit that estimates a noise level based on the representative value of the pixel of interest and a noise model registered in advance; and a noise removing unit that performs noise reduction processing based on the estimated noise level.