Light that is incident through a pair of object lenses of digital
binocular glasses is photographed by a pair of image pickup devices to
obtain a pair of images (stereoscopic image) generating a difference
corresponding to a parallax of both eyes. A geometric difference between
image structures corresponding to a parallax of both eyes is recognized
in the pair of images subjected to various corrections and stored in
memories. Thereafter, a noise reduction process is performed, which
reduces a difference (for example, a difference between random noises
superposed on the pair of images by the image pickup devices) other than
the recognized geometric difference between the image structures. The
images subjected to the noise reduction process are displayed on a pair
of display devices, and are visually recognized (stereoscopically viewed)
by the user through eyepiece lenses.