Endoscope system and characteristic amount calculation method

An endoscope system, comprising:

• a light source apparatus configured to emit first light, second light, and third light with different wavelength bands;
• an endoscope including an image capturing unit that includes an image sensor configured to generate second color image data by imaging biological tissue illuminated with the second light, and to generate third color image data by imaging the biological tissue illuminated with the third light;
• and
• a processor including:
• a storage unit storing a second light intensity ratio, which is a ratio between a light intensity of the second light and a light intensity of the third light;
• and a characteristic amount acquisition unit configured to acquire a second characteristic amount of the biological tissue based on a second corrected ratio obtained by using the second light intensity ratio to correct a second ratio that is sensitive to the second characteristic amount of the biological tissue, among ratios between a plurality of components of the second color image data of the biological tissue and a plurality of components of the third color image data of the biological tissue.

A biological tissue characteristic amount calculation method, comprising:

• a step of illuminating biological tissue with first light, second light, and third light with different wavelength bands;
• a step of generating second color image data by imaging the biological tissue illuminated with the second light using an image sensor, and generating third color image data by imaging the biological tissue illuminated with the third light;
• a step of generating a second corrected ratio obtained by using a pre-acquired second light intensity ratio, which is a ratio between a light intensity of the second light and a light intensity of the third light, to correct a second ratio that is sensitive to a second characteristic amount of the biological tissue, among ratios between a plurality of components of the second color image data of the biological tissue and a plurality of components of the third color image data of the biological tissue;
• and
• a step of calculating the second characteristic amount of the biological tissue based on the second corrected ratio.