Image processing apparatus, imaging device, image processing method, and computer-readable recording medium

摘要

An image processing apparatus includes a decimating unit configured to decimate pixels in a target image to obtain a decimated image containing a smaller number of pixels than the target image; an extracting unit configured to extract similar pixels at each of which a similarity to a pixel of interest is a threshold or more, from a region containing the pixel of interest among pixels of the decimated image; a first calculating unit configured to calculate a correction candidate value based on pixel values of the similar pixels; a second calculating unit configured to calculate a correction candidate value for each decimated pixel, based on the correction candidate value calculated for each pixel of the decimated image; and a correcting unit configured to correct a target pixel value of a target pixel in the target image, based on the correction candidate value calculated by the first or second calculating unit.

主权项

1. An image processing apparatus comprising:
circuitry configured to:
decimate pixels in a target image to be processed to obtain a decimated image containing a smaller number of pixels than the target image;extract similar pixels at each of which a similarity to a pixel of interest to be processed is equal to or greater than a first threshold, from a region containing the pixel of interest among pixels contained in the decimated image;calculate a first correction candidate value used to correct a pixel value, based on pixel values of the similar pixels;calculate a second correction candidate value for each of the pixels, based on the first correction candidate value calculated for each of the pixels contained in the decimated image;calculate a weight coefficient of a target pixel value and the first or second correction candidate value of the target pixel, based on the first or second correction candidate value of the target pixel, wherein the target pixel value is a value of a target pixel to be corrected in the target image; andcorrect the target pixel value of the target pixel, based on the first correction candidate value or the second correction candidate value, wherein the target pixel value is corrected by performing weighted addition of the target pixel value and the first or second correction candidate value by using the weight coefficient.