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US 5,561,537 AGranted
Stereoscopic display method and apparatus
AssigneeFujitsu Limited
InventorsHirokazu Aritake, Masayuki Kato, Manabu Ishimoto, Noriko Sato
Life of this patent
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Abstract
The position of a solid image which changes with the elapse of time is detected. The position of a virtual screen is set so that a distance from an object enters an allowable range such as to reduce a fatigue of an observer. A 2-dimensional image is formed at the set virtual screen position. A phase distribution is calculated at the hologram forming surface, thereby displaying a solid image. Even when the position of a solid image changes with the elapse of time, the fatigue of the eyes can be minimized.
Claims14
A stereoscopic display method, comprising:
- forming three-dimensional information whose image position changes with the elapse of time;
- setting a virtual screen plane to form a two-dimensional image at a position within a range of a predetermined limit distance which changes in correspondence to a distance from a visual point position of an observer to said image position, while tracing the image position which was obtained from the three-dimensional information formed in said three-dimensional information forming step and which changes with the elapse of time;
- forming a plurality of two-dimensional images of different visual directions from said three-dimensional information onto the virtual screen plane set in said virtual screen plane setting step;
- calculating a phase distribution at a hologram forming surface from said plurality of two-dimensional images formed in said two-dimensional image forming step;
- expressing the phase distribution obtained in said phase distribution calculating step onto the hologram forming surface;
- and
- irradiating a reference light to the phase distribution expressed in said hologram expressing step and converting into an optical wave front, thereby displaying a solid image.
4 more elements
A stereoscopic display method, comprising:
- forming three-dimensional information in which an image position changes with the elapse of time;
- setting a virtual screen plane to form a two-dimensional image at a position within a range of a predetermined limit distance which changes in correspondence to a distance from a visual point position of an observer to said image position, while tracing the image position which was obtained from the three-dimensional information formed in said three-dimensional information forming step and which changes with the elapse of time;
- forming a plurality of two-dimensional images having parallaxes in the horizontal direction onto the screen plane set in said virtual screen plane setting step as projection images of said three-dimensional information when they are seen from regions which are obtained by dividing a hologram forming surface in the horizontal direction and which are long in the vertical direction;
- calculating a phase distribution at the hologram forming surface from said plurality of two-dimensional images formed in said two-dimensional image forming step;
- expressing the phase distribution of a solid image obtained in said phase distribution calculating step onto the hologram forming surface;
- and
- irradiating a reference light to said phase distribution expressed in said holograms expressing step and converting the reference light into an optical wave front, thereby displaying a solid image.
4 more elements
A stereoscopic display apparatus, comprising:
- three-dimensional information forming means for forming three-dimensional information in which an image position changes with the elapse of time;
- virtual screen plane setting means for setting a virtual screen plane to form a two-dimensional image at a position within a range of a predetermined limit distance which changes in correspondence to a distance from a visual point position of an observer to said image position, while tracing the image position which was obtained from said three-dimensional information formed by said three-dimensional information forming means and which changes with the elapse of time;
- two-dimensional image forming means for forming a plurality of two-dimensional images in different visual directions from said three-dimensional information onto the virtual screen plane set by said virtual screen plane setting means,;
- phase distribution calculating means for calculating a phase distribution at a hologram forming surface from said plurality of two-dimensional images formed by said two-dimensional image forming means;
- hologram expressing means for expressing the phase distribution obtained by said phase distribution calculating means onto the hologram forming surface;
- and
- wave front converting means for irradiating a reference light to the phase distribution expressed by said hologram expressing means and converting said reference light into an optical wave front, thereby displaying a solid image.
4 more elements
A stereoscopic display apparatus, comprising:
- three-dimensional information forming means for forming three-dimensional information in which an image position changes with the elapse of time;
- virtual screen plane setting means for setting a virtual screen plane to form a two-dimensional image at a position within a range of a predetermined limit distance which changes in correspondence to a distance from a visual point position of an observer to said image position, while tracing the image position which was obtained from said three-dimensional information formed by said three-dimensional information forming means and which changes with the elapse of time;
- two-dimensional image forming means for forming a plurality of two-dimensional images having parallaxes in the horizontal direction onto the virtual screen plane set by said virtual screen plane setting means as projection images of said three-dimensional information when they are seen from regions which are obtained by dividing a hologram forming surface in the horizontal direction and which are long in the vertical direction;
- phase distribution calculating means for calculating a phase distribution at a hologram forming surface from said plurality of two-dimensional images formed by said two-dimensional image forming means;
- hologram expressing means for expressing said phase distribution of a solid image obtained by said phase distribution calculating means onto the hologram forming surface;
- and
- wave front converting means for irradiating a reference light to the phase distribution expressed by said hologram expressing means and converting said reference light into an optical wave front, thereby displaying a solid image.
4 more elements
Dependencies are inferred from the claim text.