Image processing device, image processing method, and image processing program

An image processing method, comprising:

• extracting signal intensity of executing an operation on an input image input to the method and calculating a reflection rate of the input image as signal intensity;
• calculating, for each small region, a peripheral region reference value based on the signal intensity of a peripheral region located around the small region of interest;
• determining an emphasis degree of the signal intensity to correct and increase the signal intensity of the small region;
• and
• obtaining a corrected value of the signal intensity of the small region using the emphasis degree,
• wherein
• the small region is defined as a region which is a part of the input image and comprises at least one pixel, and
• the emphasis degree is monotonically non-decreasing with respect to a difference between the peripheral region reference value and a predetermined value, and
• further satisfying conditions of:
• S≤T≤OL, when R≥0, and
• UL≤T≤S, when R≤0,
• wherein R represents the signal intensity of the small region of interest,
• S represents the peripheral region reference value,
• T represents the predetermined value, and
• OL and UL respectively represent an upper limit and a lower limit of the signal intensity that can be output as an output image.

A non-transitory computer-readable storage medium storing an image processing program for causing a computer to perform a predetermined function, the predetermined function comprising the functions of:

• executing an operation on an input image input to the method and calculating a reflection rate of the input image as signal intensity;
• calculating, for each small region, a peripheral region reference value based on the signal intensity of a peripheral region located around the small region of interest;
• determining an emphasis degree of the signal intensity to correct and increase the signal intensity of the small region;
• and
• obtaining a corrected value of the signal intensity of the small region using the emphasis degree,
• wherein
• the small region is defined as a region which is a part of the input image and comprises at least one pixel, and
• the emphasis degree is monotonically non-decreasing with respect to a difference between the peripheral region reference value and a predetermined value, and
• further satisfying conditions of:
• S≤T≤OL, when R≥0, and
• UL≤T≤S, when R<0,
• wherein R represents the signal intensity of the small region of interest,
• S represents the peripheral region reference value,
• T represents the predetermined value, and
• OL and UL respectively represent an upper limit and a lower limit of the signal intensity that can be output as an output image.