Appeal No. 1999-0296 Page 17
Application No. 08/483,552
limitations of “maintaining the optical axes of a left camera
and of a right camera substantially parallel ....” Any
teachings of Anderson are merely cumulative regarding the
limitation.
The reference also teaches adjusting disparity while
adjusting distance to a target object to avoid loss of stereo
effect. The appellants admit, “Robinson provides a device
which can be adjusted to change camera separation and thus
disparity.” (Reply Br. at 3.) As mentioned regarding claims
1, 2, 6, 9-11, and 14, Robinson teaches that “[i]t is
particularly advantageous to be able to increase the camera
base as object distances become greater.” Col. 3, ll. 18-20.
Furthermore, disparity is controlled to determine the limits
of a user’s stereo near and far points as follows.
The left and right marks are first positioned so that
they are superimposed. This will appear to give a
single image at the surface of the monitor screen.
If now the left image is moved to the left and the
right image to the right then the single fused image
as seen through the viewing spectacles will appear to
retreat behind the monitor screen. At some point the
disparity between the two marks will be so great that
the single image seen by the observer will break up
into two separate images. The process may be
repeated several times in order to find an average
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