A stereo camera is a type of camera with two or more lenses. This allows the camera to simulate human binocular vision, and therefore gives it the ability to capture three-dimensional images, a process known as stereo photography. Stereo cameras may be used for making stereoviews and 3D pictures for movies.
In this image processing according to the stereo method, a position where two image signals that are output from the stereo camera coincide with each other by superimposing the two image signals while shifting those sequentially. Therefore, essentially, it is desirable that there exist, between the two images, only deviations between corresponding positions as caused by a parallax; if there exist positional deviations due to other optical distortions etc., mismatching occurs and the accuracy of distance information is lowered. 1
However, conventionally, once deviations due to deterioration with age occur in a fixed stereo camera, readjustments should be performed in terms of mechanical structure. Readjustments not only require cumbersome operations but also take long time. Further, mechanical adjustments can assure only a limited degree of accuracy. 2
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