Image processing method, imaging processing apparatus and image processing program for correcting density values between at least two images

摘要

An image processing method includes: a generating step of generating a cumulative histogram of density values of pixels included in at least each of a first image and a second image; a calculating step of calculating a distance between a density value on a first histogram generated from the first image and a density value on a second histogram generated from the second image, in a space defined to include histogram frequencies of the cumulative histograms and the density values; and a determining step of determining a correspondence relation between the density values included in the first image and the density values included in the second image based on the calculated distances between the density values, and determining a conversion function for correcting a density value between the first image and the second image based on the determined correspondence relation.

主权项

1. An image processing method, comprising:
generating a cumulative histogram of density values of pixels included in at least each of a first image and a second image; calculating a distance between a first density value on a first histogram generated from said first image and a second density value on a second histogram generated from said second image, in a space defined to include histogram frequencies and density values with respect to said first and second histograms, wherein said calculating comprises setting weight in accordance with an axial distance corresponding to a histogram frequency in said space, when calculating said distance; determining a correspondence relation between said first density value included in said first image and said second density value included in said second image based on said calculated distance between said first and second density values, and determining a conversion function for correcting a third density value in said first image based on said determined correspondence relation, wherein said determining said correspondence relation comprises determining said correspondence relation between said first and second density values such that a sum of distances between all density values included in said first image and corresponding density values included in said second image is minimized.