Image signal processing apparatus and image signal processing method
AssigneeOlympus Corporation
InventorKeiji Higuchi
Life of this patent
Estimating the term…
Abstract
An image signal processing apparatus that performs a noise reduction process on an image signal of an image captured by an imaging device is provided. By performing a first smoothing process on an input signal of an image signal that is received from an imaging unit and that is subjected to a first image processing, a first smoothed signal creating unit creates a first smoothed signal in which noise is reduced. By performing a second smoothing process that is different from the first smoothing process on the input signal, the second smoothed signal creating unit creates a second smoothed signal in which noise is reduced. A mixing processing unit mixes the first smoothed signal and the second smoothed signal in accordance with a mixing ratio according to a value of the input signal.
Claims8
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.
A non-transitory computer-readable storage medium with an executable program stored thereon for reducing noise of an image signal of an image captured by an imaging device, wherein the program instructs a microprocessor to perform:
- creating a first smoothed signal in which noise is reduced by performing a first smoothing process on the image signal;
- creating 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, creating the second smoothed signal including:
- estimating 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
- performing a noise reduction process on the image signal in accordance with the amount of noise and the first smoothed signal;
- and
- mixing the first smoothed signal and the second smoothed signal in accordance with a mixing ratio according to a value of any one of the image signal, the first smoothed signal, and the second smoothed signal.
An image signal processing method of performing a noise reduction process on an image signal of an image captured by an imaging device, the image signal processing method comprising:
- creating a first smoothed signal in which noise is reduced by performing a first smoothing process on the image signal;
- creating 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, creating the second smoothed signal including:
- estimating 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
- performing a noise reduction process on the image signal in accordance with the amount of noise and the first smoothed signal;
- and
- mixing the first smoothed signal and the second smoothed signal in accordance with a mixing ratio according to a value of any one of the image signal, the first smoothed signal, and the second smoothed signal.
Dependencies are inferred from the claim text.