Stereo image display technology is reflected by the effect must
be. The stereoscopic display refers to the image in
three-dimensional space information for reproduction, which is
obtained by stereo vision and basic conditions. Realization of
stereo display mainly has two kinds of methods, namely two to
display method and multiple display method.
( 1 ) two to display method. Can be divided into stereoscopic
method, color filter method, a polarizing color filter and
alternative segmentation method. Whichever approach is adopted,
both left and right eyes were observed using binocular parallax
image and stereo vision.
Stereoscopic method: stereoscopic method basic principle is the use
of stereoscopic to observe left, right and the formation of
three-dimensional graphics. This method appears from nineteenth
Century has been widely adopted, but must use special stereoscopic,
otherwise there is no stereo vision. Double color filter method:
left, right image respectively red, blue ink printed on the same
plane, through the red, blue filter observation methods of printing
images. Because of color and ink which is complementary relation,
so the filter observation image is not red and blue and
black.
Therefore, this method is limited to black and white photo, not
suitable for color printing. Coupled with the light of different
wavelengths respectively into the eyes, easy to make eye fatigue.
Therefore, this method in addition to the production of aviation
map use, general rarely used.
Polarizing color filter method: left, right image respectively by
mutual orthogonal polarizing filter projection in the same plane,
the left, the right eye in the same polarizing color filter were
observed. Although this method requires special glasses, but in the
movie and television has been widely used. Alternative segmentation
method: left, right image presented alternately in the same plane
and the corresponding period the unnecessary part cover, thereby
generating stereoscopic. As a result of residual image effect can
cause flash, shielding glasses price is higher, therefore, this
method has so far failed to popularize.
Stereoscopic printing principle
( 2) multiple display method. Mainly parallax shield method and
cylindrical lens method. Parallax shield method: parallax shield
method also known as parallax slit method, was invented in 1930 by
F.E.Lves, its working principle is to the left and right eye images
by slits are divided and in the film exposure, and then developing,
print and printing. If you place it in photography when the same
position, his eyes were also placed the location of the image, you
can see the stereo image. Application of parallax slit method, if
the two images are synthesized, can obtain parallax stereo
image.
If the lower slit openings than, can complete a plurality of image
synthesis, can obtain parallax panoramic image. Parallax slit
method in essence, light decline is inevitable. Therefore, now
except in the cylindrical lens method used in photography, general
rarely used.
Cylindrical lens method: cylindrical lens can be seen as composed
of many convex lens a lens board side by side, it is like action.
This lens and the rear surface of the plane of focus coincide.
Because the lens as a function of the orientation of the image, A,
B, C, a, B, D is separated into C, D and in the focal plane is
recorded, as long as the left, right eyes in B, C, you can see the
stereo image.
