Image processing device and image processing method

摘要

In order to provide an image processing device and the like making it possible to generate a target image in which edges of a structure are upheld and from which streaking artifacts are removed, a computation device determines a shape of a non-linear function on the basis of feature amounts of an original image and a smoothed image (S101). Next, the computation device calculates a condition coefficient of the original image and the smoothed image by using the non-linear function for which the shape was determined in S101 (S102). Next, the computation device uses the condition coefficients calculated in S102 to calculate a weighting coefficient for each of the pixels of the original image and the smoothed image (S103). Next, the computation device adds weighting to the original image and the smoothed image to generate the target image (S104).

主权项

1. An image processing device for adding respective mutually corresponding pixels of an original image, including streak artifact, generated from original information and of a smoothed image generated from the same original information and reduced at least in the streak artifact with weighting using a weighting coefficient and generating a target image that an edge of a structure is maintained and the streak artifact is removed, comprising:
a function shape determination unit that determines a shape of a nonlinear function on the basis of feature amounts of the original image and the smoothed image; and a weighting coefficient calculation unit that calculates the weighing coefficient on the basis of the nonlinear function, wherein the function shape determination unit includes
a division unit that divides regions of the original image and the smoothed image into plural mutually corresponding small regions,a decreasing rate calculation unit that calculates variation values for the small regions pertaining to both of the original image and the smooth image and calculates a decreasing rate of the variation value of the smoothed image based on the variation value of the original image, for each of the small regions,a region extraction unit that extracts a feature amount calculation region from a set of the small regions on the basis of the decreasing rate, anda feature amount calculation unit that calculates the feature amount from a pixel value of the feature amount calculation region.