Abstract: An optical member includes aperture regions, a lens device, and an imaging apparatus. A lens device includes: an imaging optical system; a first polarizing part that polarizes at least a part of rays transmitted through the imaging optical system; and a filter unit that is disposed at a pupil position of the imaging optical system or near the pupil position, and includes aperture regions transmitting the rays of the imaging optical system and including a first aperture region and a second aperture region, wavelength selective filters disposed in the first aperture region and the second aperture region and transmitting pieces of light of which at least a part of wavelength ranges are different from each other, and a second polarizing filter including polarizing filters disposed in the first aperture region and the second aperture region and having polarization directions different from each other.

Abstract: There are provided an image processing apparatus, an endoscope system, and an image processing method for assisting diagnosis more effectively by calculating more intuitive and useful information than blood vessel information for a specific submucosal depth. An image processing apparatus includes a processor configured to function as an image acquisition unit that acquires an endoscope image, a blood vessel extraction unit that extracts a blood vessel at a specific depth of the observation target from the endoscope image, a blood vessel information calculation unit that calculates blood vessel information regarding the blood vessel extracted by the blood vessel extraction unit, and a blood vessel parameter calculation unit that calculates a blood vessel parameter, which is relevant to the blood vessel at the specific depth, by calculation using the blood vessel information.

Abstract: To provide a resist composition including: at least one polymerizable compound having a viscosity of 100 mPa·s or less at 25° C.; a fluorine-containing compound A having a viscosity of 5,000 mPa·s or greater at 25° C., and a fluorine content of 10% by mass or greater; and a fluorine-containing compound B having a viscosity of 2,000 mPa·s or less at 25° C., and a fluorine content of 10% by mass or greater.