Patent ID: 9492059
Filing Date: 2016-11-15
CPC Classification: A61B,G02B,G06T,H04N

Claim Text:
1. An endoscope apparatus comprising: an image acquisition section that acquires a captured image in a zoom observation state in time series based on an image signal from an image sensor, the zoom observation state being an observation state in which a magnification of an optical system is higher than that in a normal observation state; a defocus amount information extraction section that extracts defocus amount information from the captured image in the zoom observation state; and a defocus amount correction section that corrects the captured image based on the extracted defocus amount information, wherein the defocus amount information extraction section includes a specific frequency band image extraction section that extracts, as the defocus amount information, a specific frequency band image from the captured image, the specific frequency band image being an image of a specific frequency band which is determined in accordance with the magnification of the optical system in the zoom observation state, wherein: the specific frequency band image extraction section includes: the specific frequency band image extraction section extracts the specific frequency band image based on the image generated by the subtraction section and the noise amount estimated by the noise amount estimation section; and the defocus amount correction section includes: