Television – Stereoscopic – Stereoscopic display device
Reexamination Certificate
1998-03-19
2001-03-13
Le, Vu (Department: 2713)
Television
Stereoscopic
Stereoscopic display device
C348S052000, C348S053000
Reexamination Certificate
active
06201566
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to video display method and video display apparatus which can express a front/rear feeling and a stereoscopic feeling of an object to be displayed when a video image based on an input video signal is displayed.
2. Description of the Related Art
As a system having the highest realization among stereoscopic display systems, there is a stereoscopic display system using right/left parallax information. According to such a system, two cameras are used upon photographing and a video image for the left eye and a video image for the right eye are photographed so as to have parallax information. By reproducing the video images so that two images are separately projected to the right and left eyes, a stereoscopic display can be performed.
FIGS. 1A and 1B
show a principle of the stereoscopic operation using a binocular (right/left) parallax. Images obtained by shifting a left-eye video image
3
L and a right-eye video image
3
R in the horizontal direction are displayed on a display plane
1
. Usually, a focal point (a point at which the right and left lines of sight cross: such a point is called a point where the vergences are matched) of both of the left and right eyes (
2
L,
2
R) and a focal point (a point where the adjustment of the eye in case of a single eye is matched) of each eye (
2
L,
2
R) are located at the same position. Specifically speaking, in case of a CRT or the like, the CRT surface corresponds to the location where the vergences and the adjustments are matched. In case of a projector or the like, the screen corresponds to the location where the vergences and the adjustments are matched.
FIG. 1A
shows a case of a cross vergence. In this case, the video image
3
R shifted to the left is allowed to be projected to the right eye
2
R and the video image
3
L shifted to the right is allowed to be projected to the left eye
2
L. At this time, an image is synthesized in the head as if an object existed at a location where the vergences of the right and left eyes are matched. Such an imaginary image
4
A is seen as if it was projected to the front side from the display plane
1
. On the other hand,
FIG. 1B
shows a case of a parallel vergence (non-cross vergence). In this case, the video image
3
L shifted to the left is allowed to be projected to the left eye
2
L and the video image
3
R shifted to the right is allowed to be projected to the right eye
2
R. In the parallel vergence, an imaginary image
4
B is synthesized to the rear side from the display plane
1
.
A technique for enabling a stereoscopic feeling to be obtained even in an ordinary two-dimensional image by using the principle of the right/left parallax is an emphasis of a stereoscopic feeling using an effect of Pulfrich. The effect of pendulum of Pulfrich denotes “when an object which reciprocates to the right and left in the vertical plane in front of the eyes is observed by both eyes while a filter (ND filter) for reducing light is attached in front of one eye, the object is seen as if it moved with a depth while drawing a locus on an ellipse in a manner such that the object exists before and behind the plane”. For example, as shown in
FIG. 2
, in a state where an ND filter
5
is attached in front of the left eye
2
L, a pendulum which reciprocates to the right and left in a plane
6
is observed. When the pendulum moves from the right to the left, the pendulum passes in front of the plane
6
. On the contrary, when the pendulum moves from the left to the right, the pendulum passes through the rear side from the plane
6
. Consequently, the pendulum is observed as if the locus of the pendulum formed an elliptical orbit
7
.
The effect of pendulum of Pulfrich occurs because when signals from the eyes are transmitted to the cerebrum, the left eye
2
L for which the light is weakened has a time delay as compared with the right eye
2
R for which the light is not weakened. That is, in an example of
FIG. 2
, when the pendulum moves from the right to the left and is located at a position of q, the signal from the left eye
2
L is delayed, so that at this moment, the left eye
2
L recognizes as if the pendulum existed at a position of p. In this manner, a binocular parallax occurs and the observer feels as if the pendulum existed at a position of N by the cross vergence shown in
FIG. 1A
mentioned above. On the contrary, when the pendulum moves from the left to the right and exists at the position of q, the left eye
2
L recognizes as if the pendulum existed at a position of r. Due to the binocular parallax, the observer feels as if the pendulum existed at a position of F by the parallel vergence shown in FIG.
1
B.
Hitherto, as a method of enhancing the stereoscopic feeling of an ordinary 2-dimensional video image, a method using the foregoing Pulfrich's effect has been known. The above method, however, has a drawback such that a stereoscopic feeling (depth feeling) of only the object which moves in a specific direction is merely expressed and the effect is not derived in a still portion. Such a method also has a drawback such that the stereoscopic feeling is influenced by a moving speed and its direction of the object. In other words, the depth feeling changes depending on the moving speed and the front/rear side is unconditionally determined by the moving direction. As mentioned above, according to the conventional stereoscopic feeling emphasizing method, the stereoscopic feeling (depth feeling) for only an object which moves in a specific direction can be correctly expressed.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the invention to provide video display method and display apparatus which can express a stereoscopic feeling even in a still portion by using a two-dimensional video signal source.
According to the invention of claim
1
, there is provided a video display method of receiving a video signal and forming a video signal to be displayed on a display apparatus, comprising the steps of: detecting edge information of the input video signal; and detecting a front/rear relation of an object in a video image on the basis of the detected edge information.
According to the invention of claim
8
, a video display apparatus for displaying the video image as mentioned above is provided.
According to the invention of claim
2
, there is provided a video display method of receiving a video signal and displaying a video image to a display apparatus, comprising the steps of: detecting edge information of the input video signal; detecting a front/rear relation of an object in the video image on the basis of the detected edge information; controlling a position of the image so as to move in the horizontal direction on the basis of the detected front/rear relation; and displaying a video image having a right/left parallax formed as a result of the control.
According to the invention of claim
9
, a video display apparatus for displaying the video image as mentioned above is provided.
According to the invention of claim
3
, there is provided a video display method of receiving a video signal and displaying a video image to a display apparatus, comprising the steps of: detecting edge information of the input video signal; detecting a front/rear relation of an object in the video image on the basis of the detected edge information; modulating is depth information as stereoscopic information on the basis of the detected front/rear relation; and
displaying a video image having the modulated depth information.
According to the invention of claim
10
, a video display apparatus for displaying the video image as mentioned above is provided.
A video image is generally photographed by using a camera. In many cases, the camera photographs around a focused location as a center. In many cases, at such a focused location, an amplitude of a high frequency component of the video signal is higher than that of the other region. Even in an auto-focusing process of a video camera, a point of a large amplitude of the high frequency compo
Fujihara Kazuhiko
Harada Shigeru
Kagita Junji
Ohsawa Yoshihito
Chang Dexter T.
Frommer William S.
Frommer Lawrence & Haug LLP.
Le Vu
Sony Corporation
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