Endoscope system, method of generating endoscope image, and processor

A method of generating an endoscope image, the method comprising:

• receiving light from a subject and generating image pickup signals respectively corresponding to a plurality of different colors;
• simultaneously illuminating the subject with light in a first wavelength band having a spectral characteristic of a narrow band having a peak in a range from a wavelength of 585 nm to a wavelength of 615 nm and light in a second wavelength band having a spectral characteristic for making, among a red signal, a green signal, and a blue signal generated based on the image pickup signals respectively corresponding to the plurality of different colors, a pixel value of the red signal smallest;
• and
• assigning either one of the red signal generated by the color image pickup device receiving return light from the subject illuminated with the light in the first wavelength band and the green signal or the blue signal generated by the color image pickup device receiving return light from the subject illuminated with the light in the second wavelength band to each of output channels corresponding to the respective colors in a display device configured to display a color image.

An endoscope system comprising:

• a color image pickup device including a red pixel configured to output a red image pickup signal based on light transmitted by a red color filter, a green pixel configured to output a green image pickup signal based on light transmitted by a green color filter, and a blue pixel configured to output a blue image pickup signal based on light transmitted by a blue color filter;
• a light source device configured to simultaneously illuminate a subject with light in a first wavelength band having a spectral characteristic of a narrow band having a peak in a range from a wavelength of 585 nm to a wavelength of 615 nm and light in a second wavelength band having a spectral characteristic of a narrow band having a peak in a range from a wavelength of 400 nm to a wavelength of 585 nm;
• and
• a processor configured to assign either one of a red image signal based on the red image pickup signal generated by the color image pickup device receiving returned light from the subject illuminated with the light in the first wavelength band and a green image signal based on the green image pickup signal generated by the color image pickup device receiving return light from the subject illuminated with the light in the second wavelength band to a red channel configured to output a red component, a green channel configured to output a green component, and a blue channel configured to output a blue component at each of pixels in a display device configured to display a color image.