Nippon Telegraph and Telephone Corporation

Munekazu Date

Shiro Suyama

Kinya Kato

Hideaki Kimata

Shigenobu Sakai

Shigeto Kohda

Kazutake Uehira

Megumi Isogai

Hideaki Takada

Shinya Shimizu

Masahiro Ueno

Takasuke Nagai

A camera parameter derivation apparatus for deriving camera parameters of a plurality of cameras for which conditions that the cameras be arranged at ideal positions that are set on a straight line at equal intervals and that directions of all arranged cameras be parallel to each other have been set includes an internal parameter derivation unit that derives internal parameter matrices of the cameras based on estimated internal parameter matrices for all cameras that are arranged at estimated positions while being oriented in estimated directions, a camera position derivation unit that derives ideal positions of the cameras that minimize the maximum of the distances between the estimated positions and the ideal positions, and a rotation matrix derivation unit that derives rotation matrices for correcting external parameters such that errors from parallel directions are equal to or less than a threshold value.

Camera parameter derivation apparatus, camera parameter derivation method, and camera parameter derivation program

A display device which can reproduce kinematic parallax and express a high sense of realism without using image display means are provided. The display device includes an image display unit having a stripe structure having subpixels of a plurality of colors disposed so that subpixels of the same color are arranged in a first direction and enabling an observer to observe, through an aperture, an image formed by pixels, each pixel being constituted by the subpixels of a plurality of colors. The aperture has a shape that has been smoothed to reduce a number of corners in which areas of the subpixels of the plurality of colors which can be seen through the aperture are uniform, and in which a numerical aperture decreases along a second direction orthogonal to the first direction. A plurality of the apertures are provided so as not to overlap with each other.

Display device and display method reproducing kinematic parallax for expressing high sense of realism

Light having high directivity and high uniformity is emitted. A light source apparatus () according to the present invention includes: a light emitting body group () in which a plurality of light sources () that emit directional light are arranged on one surface; and a first visual field limiting film () that is provided on an optical path of the light emitted from the plurality of light sources (), and outputs light that enters the first visual field limiting film in a first predetermined angular range by homogeneously diffusing the light within the first predetermined angular range.

Light source device and display device

A display device and a display method which can reproduce kinematic parallax and express a high sense of realism without using image display means are provided. The display device includes an image display unit having a stripe structure having subpixels of a plurality of colors disposed so that subpixels of the same color are arranged in a first direction and enabling an observer to observe, through an aperture, an image formed by pixels, each pixel being constituted by the subpixels of a plurality of colors. The aperture has a shape in which areas of the subpixels of the plurality of colors which can be seen through the aperture are uniform, and in which a numerical aperture decreases along a second direction orthogonal to the first direction. A plurality of the apertures are provided so as not to overlap with each other.

A three-dimensional display device includes a plurality of transmissive display units arranged in different depth positions in view from an observer and a moir&#xe9; vanishing element for diffusing light. The moir&#xe9; vanishing element has a spatial frequency characteristic to cut off a spatial frequency more than a spatial frequency having a cycle being twice as large as an interval of boundaries of pixels forming a first transmissive display unit arranged behind the moir&#xe9; vanishing element in the view from the observer.

Three-dimensional display device and image presentation method

An optical device includes a transparent material layer having a desired curved surface configuration, a layer including a variable refractive index material having a dielectric constant anisotropy, at least two transparent electrodes arranged to sandwich the transparent material layer and the variable refractive index material, and a driving device supplying a voltage including driving frequencies fand fbetween the transparent electrodes. The difference &#x394;&#x2208; in the dielectric constant of the variable refractive index material due to the anisotropy is positive at one of the driving frequencies and negative at the other driving frequency.

Optical device and three-dimensional display device

An optical device and a display apparatus of the present invention are constructed so as to improve display characteristics of output light intensity, display contrast, and reduction of scattered light due to external light, and also to provide a large-screen. The optical device has a first stacked body and a plurality of second stacked bodies. The first stacked body includes a light guide, a first electrode, and an optical control layer. The second stacked body includes a plurality of second electrodes, the reflection film and a substrate. There is an optical control layer which changes in scattering degree or diffraction efficiency by an electric field applied by said first electrode and said second electrode.

Optical device and display apparatus having a plate-shaped light guide and an optical control surface thereon

An optical device and a display apparatus of the present invention are constructed so as to improve display characteristics of output light intensity, display contrast, and reduction of scattered light due to external light, and also to provide a large-screen. The optical device has a first stacked body and a plurality of second stacked bodies. The first stacked body includes a light guide, a first electrode, and an optical control layer. The second stacked body includes a plurality of second electrodes, the reflection film and a substrate. At least one of said first electrode and said second electrode has a periodic structure for inducing a fine periodic structure for light diffraction in said optical control layer.

Optical device and display apparatus using light diffraction and light guide

An optical device includes a transparent material layer having a desired curved surface configuration, a layer including a variable refractive index material having a dielectric constant anisotropy, at least two transparent electrodes arranged to sandwich the transparent material layer and the variable refractive index material, and a driving device supplying a voltage including driving frequencies f and f between the transparent electrodes. The difference &Dgr;&isin; in the dielectric constant of the variable refractive index material due to the anisotropy is positive at one of the driving frequencies and negative at the other driving frequency.

An optical device and a display apparatus of the present invention are constructed so as to improve display characteristics of output light intensity, display contrast, and reduction of scattered light due to external light, and also to provide a large-screen. The optical device has a first stacked body and a plurality of second stacked bodies. The first stacked body includes a light guide, a fist electrode, and an optical control layer. The second stacked body includes a plurality of second electrodes, the reflection film and a substrate. A plurality of third electrodes are provided through the substrate. Each of the third electrode has a first end part connecting to the second electrode and a second end part exposed to the other side of the substrate. A further light absorption film may be disposed between the reflection film and the second electrode.

Optical device having reverse mode holographic PDLC and front light guide

An optical device includes a transparent layer having a desired curved surface configuration, a layer including a variable refractive index material having a dielectric constant anisotropy, at least two transparent electrodes arranged to sandwich the transparent material layer and the variable refractive index material, and a driving device supplying a voltage including driving frequencies f and f between the transparent electrodes. The difference &Dgr;&isin; in the dielectric constant of the variable refractive index material due to the anisotropy is positive at one of the driving frequencies and negative at the driving frequency.

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Sayama, Japan

Munekazu Date