Processor device and method for operating same, and endoscopic system and method for operating same

A method for operating a processor device comprising:

• a first image signal acquisition step of causing an image signal acquisition unit to acquire a first image signal corresponding to a first wavelength band whose light absorption amount varies according to a density of a pigment other than hemoglobin among pigments included in an observation target, a second image signal corresponding to a second wavelength band whose light absorption amount varies according to an oxygen saturation degree of the hemoglobin included in the observation target, a third image signal corresponding to the third wavelength band that has a wavelength longer than the first wavelength band and the second wavelength band and whose light absorption amount varies according to an amount of blood, and a fourth image signal corresponding to a fourth wavelength band that has a wavelength longer than the third wavelength band;
• and
• a correlation correction step of causing a correlation correction unit to calculate a correction amount of a correlation between a first calculated value obtained by a specific calculation based on the second image signal, the third image signal, and the fourth image signal, and the oxygen saturation degree on the basis of the first image signal, the second image signal, the third image signal, and the fourth image signal, and to correct the correlation on the basis of the correction amount
• wherein the correlation correction step includes a living body internal information calculation step of causing a living body internal information calculation unit to calculate information in a living body of the observation target on the basis of a first signal ratio between the first image signal and the third image signal, a second signal ratio between the second image signal and the third image signal, and a third signal ratio between the fourth image signal and the third image signal, a correction amount calculation step of causing a correction amount calculation unit to calculate the correction amount on the basis of predetermined reference information and the living body internal information, and a correction step of causing a correction unit to correct the correlation on the basis of the correction amount.

A method for operating an endoscopic system comprising:

• a light emission step of causing a light source device to sequentially emit light in a first wavelength band whose light absorption amount varies according to a density of a pigment other than hemoglobin among pigments included in an observation target, light in a second wavelength band whose light absorption amount varies according to an oxygen saturation degree of the hemoglobin included in the observation target, light in a third wavelength band that has a wavelength longer than the first wavelength band and the second wavelength band and whose light absorption amount varies according to an amount of blood, and light in a fourth wavelength band that has a wavelength longer than the third wavelength band,
• a first image signal acquisition step of causing an image signal acquisition unit to acquire a first image signal corresponding to the first wavelength band, a second image signal corresponding to the second wavelength band, a third image signal corresponding to the third wavelength band, and a fourth image signal corresponding to the fourth wavelength band;
• and
• a correlation correction step of causing a correlation correction unit to calculate a correction amount of a correlation between a first calculated value obtained by a specific calculation based on the second image signal, the third image signal, and the fourth image signal, and the oxygen saturation degree on the basis of the first image signal, the second image signal, the third image signal, and the fourth image signal, and to correct the correlation on the basis of the correction amount
• wherein the correlation correction step includes a living body internal information calculation step of causing a living body internal information calculation unit to calculate information in a living body of the observation target on the basis of a first signal ratio between the first image signal and the third image signal, a second signal ratio between the second image signal and the third image signal, and a third signal ratio between the fourth image signal and the third image signal, a correction amount calculation step of causing a correction amount calculation unit to calculate the correction amount on the basis of predetermined reference information and the living body internal information, and a correction step of causing a correction unit to correct the correlation on the basis of the correction amount.