1. Field of the Invention
The present invention relates to a stereoscopic image observing apparatus for stereoscopically displaying an image picked-up for a medical field.
2. Description of the Related Art
Recently, an operation using an endoscope having such an advantage of low-invasiveness to a patient is widely spread in a medical field. In the operation using the endoscope, an endoscope image is a two-dimensional image and therefore it is extremely difficult to operate an operation treatment tool to the patient, compared to an operation under direct viewing.
Since a stereoscopic endoscope can display a stereoscopic image in the body cavity to the operator, it is advantageous to provide the operability which is approximate to the direct viewing by the operator. Thus, various systems of the above-mentioned stereoscopic endoscope have already been suggested.
As one example of the stereoscopic endoscopes, a head-mounted display system is suggested whereby beams from images having the parallax displayed on an image display device are directly projected onto the right and left eyes of an observer by an optical system arranged near the pole of the observer face, and image information on a large screen is equivalently and stereoscopically observed as a virtual image. As another example of the stereoscopic endoscopes, a monitor system is suggested whereby the image having the parallax is sequentially displayed on the monitor at the same position, the observer attaches an eye glass having a right and left sequential switching shutter function which is synchronous to the image sequentially switched on the monitor, and the image on the monitor is stereoscopically observed.