Patent ID: 8564652

Claim:
An endoscope apparatus, comprising: an endoscope in which an image pickup device and a light guide that emits an illuminating light are mounted; a signal processing apparatus to which the endoscope is detachably connected, and which performs signal processing with respect to an output signal of the image pickup device that is mounted in the endoscope that is connected; and a color correction section that performs color correction processing by performing multiplication between a color correction coefficient that is set based on a plurality of numerical apertures with respect to a plurality of different wavelengths included in a wavelength band of illuminating light of the light guide that is mounted in the endoscope that is connected, and at least one of signals of B, G and R generated by the signal processing apparatus, wherein, with respect to the color correction coefficient, taking as a reference a color signal of G among color signals of R, G and B that are generated based on an output signal of the image pickup device by the signal processing apparatus, color correction is performed using a condition of a coefficient of equation (3) to equation (5) below, respectively, by means of a B signal correction coefficient of equation (1) and an R signal correction coefficient of equation (2) below with respect to color signals of B and R: B signal correction coefficient=( NA g /NA e /α B ) β (1) R signal correction coefficient=( NA c /NA e /α R ) β (2) 1≦α B ≦1.2 (3) 0.9≦α R ≦1 (4) 1<β≦5 (5) where, NA g , NA e and NA c represent a numerical aperture of a light guide at a g line, an e line, and a C line, respectively; α B and α R represent coefficients that are set based on NA g , NA e and NA c of a light guide that serves as a reference; and β represents a coefficient that is set in accordance with an optical characteristic of a light source apparatus to which the endoscope is connected.