| 摘要 |
A correction for dark current is performed in comparatively accurate fashion. To accomplish this, emissions of both ordinary light and excitation light are turned off when a changeover is made between a ordinary-light observation mode, in which internal tissue is imaged by illuminating it with ordinary light, and an excitation-light observation mode, in which internal tissue is imaged by illuminating it with excitation light. A dark-current correction is performed using data (dark-current data) obtained by imaging the internal tissue while no light is illuminating the internal tissue.
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