| 摘要 |
PROBLEM TO BE SOLVED: To accurately align a plurality of spectral images of different imaging timing by a simple configuration when calculating an oxygen saturation from the plurality of spectral images.SOLUTION: The plurality of spectral images PB1, PB2 and PB3 are acquired from imaging signals of different imaging timing. Since light absorption characteristics of blood hemoglobin and scattering characteristics of living tissue have wavelength dependence, a difference in contrast is generated between each of the spectral images PB1, PB2 and PB3, and the contrast of the spectral image PB2 is low compared to the spectral image PB1. As preprocessing of alignment, contrast adjustment of matching the contrast of the spectral image PB2 with the spectral image PB1 is performed. |
