Patent ID: 8711250

Claim:
An image signal processing apparatus that performs a noise reduction process on an image signal of an image captured by an imaging device, the image signal processing apparatus comprising: a first smoothed signal creating unit that creates a first smoothed signal in which noise is reduced by performing a first smoothing process on the image signal; a second smoothed signal creating unit that creates a second smoothed signal in which noise is reduced by performing a second smoothing process that is different from the first smoothing process on the image signal, the second smoothed signal creating unit including: a noise-level estimating unit that estimates an amount of noise in accordance with both the first smoothed signal and a noise generating model that is previously set in relation to the imaging device; and a noise reduction processing unit that performs a noise reduction process on the image signal in accordance with the amount of noise and the first smoothed signal; and a mixing processing unit that mixes the first smoothed signal and the second smoothed signal in accordance with a mixing ratio according to a value indicated by any one of the image signal, the first smoothed signal, and the second smoothed signal.