Image processing method, image processing device, and storage medium

An image processing device comprising:

• at least one memory storing a program;
• and
• at least one processor configured to execute the program to perform:
• estimating, by using image data and a spectral sensitivity characteristic of a color image sensor in a wavelength range from visible light to near-infrared light, a spectral distribution characteristic of an incident light incident on the color image sensor, based on a model expressing the spectral distribution characteristic of the incident light, the image data including one or more color channels and acquired by capturing, using the color image sensor, the incident light including visible light and near-infrared light;
• and
• generating, by using the estimated spectral distribution characteristic of the incident light and the spectral sensitivity characteristic of the color image sensor, visible light image data composed only of information representing visible light and near-infrared light image data composed only of information representing near-infrared light, wherein
• each integral value of the spectral sensitivity characteristic of the color image sensor in a wavelength range of near-infrared light relating to each of the one or more color channels of the color image sensor satisfies a predetermined condition.

A non-transitory storage medium recording an image processing program for causing a computer to execute:

• estimation processing of estimating, by using image data and a spectral sensitivity characteristic of a color image sensor in a wavelength range from visible light to near-infrared light, a spectral distribution characteristic of an incident light incident on the color image sensor, based on a model expressing the spectral distribution characteristic of the incident light, the image data including one or more color channels and acquired by capturing, using the color image sensor, the incident light including visible light and near-infrared light;
• and
• generation processing of generating, by using the estimated spectral distribution characteristic of the incident light and the spectral sensitivity characteristic of the color image sensor, visible light image data composed only of information representing visible light and near-infrared light image data composed only of information representing near-infrared light, wherein
• each integral value of the spectral sensitivity characteristic of the color image sensor in a wavelength range of near-infrared light relating to each of the one or more color channels of the color image sensor satisfies a predetermined condition.