Noise reduction device, noise reduction method and image capturing device

Abstract

A noise reduction device comprises a first signal reading-out unit for reading out a video signal of a target pixel for which a noise reduction is performed; a second signal reading-out unit for reading out video signals of external peripheral pixels arranged around internal peripheral pixels arranged at positions closest to the target pixel, the external peripheral pixels being arranged at positions closest to the target pixel in radial directions from the target pixel and outputting the same color signals as the video signal of the target pixel; a selection controller for judging presence of a correlation between the video signal of the target pixel and a video signal of each of the external peripheral pixel based on a relation between a signal value of the video signal of the target pixel and a signal value of the video signal of each of the external peripheral pixels; a signal calculator for calculating the signal value of the video signal of the target pixel by use of the signal values of the video signals of the external peripheral pixels; and a selector for selecting the signal value of the video signal of the target pixel determined by the signal calculator when it is judged by the selection controller that the number of the video signals of the external peripheral pixels having correlations with the video signal of the target pixel is large.