Transmission of hologram is very important to realizing the holographic 3D TV. Transmission of
Computer Generated Hologram(CGH) data using SSTV wire-less method was tried before and
one frame with 76.8k bit data transmitted by 2kbbs was reported1-2). In this research we
consider about more high speed transmission and more high resolution hologram data
transmission and reconstruction using white LED.
In the microwave band, the radiated wave from the pyramidal horn antenna is calculated in the diffracted field by
the Fresnel approximation. In addition, the Fresnel approximation has been introduced into the diffracted field
with half infinite diffraction plane. This phenomenon is examined compared with the experiment value based on
a hologram interpretation. In this report, the electromagnetic diffracted field with the pyramid horn antenna is
calculated as the first stage under the Fresnel approximation. As a result, the hologram was made by interfering
with the reference wave whose obtained diffracted field and angle of incidence are 60° on the computer. It can
be interpreted that this is one computer generated hologram. Moreover, the image that this hologram pattern
is reconstructed in optics with the He-Ne laser was obtained.
KEYWORDS: 3D image processing, 3D displays, Holography, Holograms, 3D image reconstruction, Particles, Scattering, Digital micromirror devices, Image processing, Volume holography
As a technique for displaying holographic three-dimensional (3D) images in the wide region with a wide viewing angle, spatial projecting technique onto the mist screen is well-known. For such purposes, other various techniques have been studied, however, it has been difficult to take a side view of 3D images. In order to overcome this problem, we have been challenged to improve a holographic 3D displaying system employing a mist screen. In this paper, we shall report a new display system which has an improved jetting mechanism compensating the characteristics of the mist screen and gives volumeful 3D images by combining the reconstructed waves from two ways. It is also shown that by the use of this system, we can better observe 3D images in the wider viewing region than before. From this, we confirmed the possibility of a holographic projecting process adopted mist screen displaying volumeful 3D holographic images.
Using a two-dimensional fast Fourier transform is an efficient way to calculate a kinoform. High-speed processing of large amounts of data points (e.g., a 512×512 matrix) can be accomplished using a kinoform. Real-time computer-generated hologram calculation has been widely pursued. To this end, use of the graphics processing unit (GPU) or multiprocessing methods are becoming popular for high-speed processing. We used the GPU method coupled with multiprocessing to construct a kinoform and measured the efficiency of this method.
Computer holographic stereogram (CHS) is useful for holographic 3D TV because it is constructed from
the multi horizontal viewpoint plane images and is compatible to the multi camera stereoscopic image.
Each hologram is recorded as a slit hologram (element hologram) but total viewing area and the number
of the element holograms have been limited to some extent by the size and the resolution points of LCD.
Therefore we used two LCDs for making CHS and deposited them horizontally and increased the viewing
points to two times and extend the display area to satisfy the binocular parallax. We considered how
viewing area becomes extended. We consider how we could improve the characteriostics of the images of
CHS. We got moving images with this system using web-camera and also we considered the real time
calculation about the hologram 3D-TV.
Transmission of hologram is very important to realizing the holographic 3D TV. Transmission of
Computer Generated Hologram(CGH) data using SSTV wire-less method is tried before and one
frame with 76.8k bit data is transmitted by 2kbbs is reported1). In this research we consider to
more high speed transmission and more high resolution hologram data transmission using white
LED.
In this paper, a transmitting process of a sequence of holograms describing 3D moving objects over the communicating
wireless-network system is presented. A sequence of holograms involves holograms is transformed into a bit stream data,
and then it is transmitted over the wireless LAN and Bluetooth. It is shown that applying this technique, holographic
data of 3D moving object is transmitted in high quality and a relatively good reconstruction of holographic images is
performed.
KEYWORDS: 3D image reconstruction, 3D displays, Particles, Control systems, Distortion, 3D image processing, Light scattering, Holograms, Displays, Holography
We have been developing the projection type display system[1]. In the case of projection type display, it needs
to use the screen in order to project the image clearly. We could get the wide viewing area using the mist
screen[2-4]. However, the image with mist screen was flickered by gravity and air flow. Then we considered
to reduce the flicker of the image and we found that flicker can be reduced and viewing angle became more
large.
This time we report the large viewing angle projection type display system using screen made up with very
small particle size smoke and flow controlled nozzle. Hence, at first we considered the most suitable particle
for the screen and then the shape of screen and then we constructed the array of flow controlled smoke screen.
By the results of experiment we could get considerably high contrast flicker-less image and get the viewing
angle more than 60° by this flow controlled nozzle attached new type smoke screen and moreover we can get
the walk through type display with this method and make clear the efficiency of this method.
KEYWORDS: 3D image reconstruction, Particles, Control systems, 3D displays, Distortion, 3D image processing, Displays, Light scattering, Holograms, Holography
In the case of projection type display[1], it needs to use the screen in order to project the image clearly
and wide viewing angle. We have been developing the projection type display system using the mist
screen[2-4]. However, the image with mist screen was flickered by gravity and air flow. Then we considered
to reduce the flicker of the image and we found that flicker can be reduced and viewing angle became more
large.
This time we report the large viewing angle projection type display system using screen made up with very
small particle size smoke and flow controlled nozzle. Hence, at first we considered the most suitable particle
for the screen and then the shape of screen and then we constructed the array of flow controlled smoke screen.
By the results of experiment we could get considerably high contrast flicker-less image and get the viewing
angle more than 60° by this flow controlled nozzle attached new type smoke screen and moreover we can get
the step-in type display with this method and make clear the efficiency of this method.
KEYWORDS: 3D displays, 3D image reconstruction, 3D image processing, Particles, Control systems, Distortion, Holography, LCDs, Displays, Light scattering
Recently, many type of 3-D displays are now being developed. We want to see 3-D moving image with
comfortably and more expanded depth, Holography is different from the other 3-D display because
natural stereoscopic image can be obtained. We have once developed a electro-holographic display using
virtual image. But the viewing area is so small because the pixcel size of LCD is not so small.
This time we developed the projection type electro-holographic display system. In the case of
projection type holography [1], it needs to use the 3-D screen in order to project the reconstructed image
clearly and viewing angle becomes wide. We developed the electro-holographic display system using mist
3-D screen. However, a reconstructed image with mist 3-D screen was flickered by gravity and flow of air.
Then we considered to reduce the flicker of the image and we found that flicker could be reduced using
flow controlled nozzle.
Hence, at first we considered the most suitable shape of 3-D screen and then we constructed the array
of flow controlled mist 3D screen. By the results of experiment we could get considerably high contrast
3-D moving image and get the viewing area more than 30°by this flow controlled nozzle attached new
type mist 3-D screen and make clear the efficiency of this method.
KEYWORDS: Holograms, LCDs, 3D image reconstruction, Holography, Stereo holograms, 3D image processing, 3D displays, Optical components, Data conversion, Eye
Computer holographic stereogram (CHS) is useful for holographic 3D TV because it is constructed from
the multi horizontal viewpoint plane images and is compatible to the multi-view point images. Each
hologram is recorded as a slit hologram (element hologram) but total viewing area and the number of the
element holograms have been limited to some extent by the size and the resolution points of LCD.
Therefore we used two LCDs for making CHS and deposited them horizontally and increased the viewing
points to two times and extend the display area to satisfy the binocular parallax. We considered how
viewing area becomes extended. We consider how we could improve the characteriostics of the images of
CHS. From now we consider the condition such as transmission and real time calculation about the
3D-TV
An infrared transmitting technique for 3D holographic images is studied. It seems to be very effective as a transmitting
technique for 3D holographic images in the places where electric wave is prohibited to be used for transmission. In this
paper, we first explain our infrared transmitting system for holograms and a display system for the presentation of
holographic 3D images reconstructed from the received signal. Next, we make a report on the results obtained by infrared
transmission of CGH and a comparison of the real and the reconstructed 3D images in our system. As this result, it is
found that reconstructed holographic 3D images do not suffer a large deterioration in the quality and highly contrasted
ones can be presented.
A full-color electroholographic 3-D display system employing LEDs is presented, and a virtual image reconstruction technique for it is studied. It is shown that the image blur observed in the reconstruction is suppressed to a lower level than in reconstruction employing a metal halide lamp. In addition, direct, independent drives on LEDs through RGB waves make the adjustment of white balance easier, and a wide viewing angle can be attained. Full-color, high-contrast 3-D images are obtained.
Computer holographic stereogram (CHS) is useful for holographic 3D TV because it is constructed from
the multi horizontal viewpoint plane images and is compatible to the multi camera stereoscopic image.
Each hologram is recorded as a slit hologram (element hologram) but total viewing area and the number
of the element holograms have been limited to some extent by the size and the resolution points of LCD.
Therefore we used two LCDs for CHS and arranged them horizontally and increased the viewing points
to two times and considered how viewing area and reconstructed images of CHS were improved.
A transmitting process of a sequence of holograms describing 3-D moving objects over a communicating network system is presented. A sequence of holograms involves holographic information of 3-D moving objects recorded as fringe patterns. In this process, holographic information recorded in the holograms is transformed into bit stream data, and then is transmitted over the Internet. We call this process a "network streaming technique." It is shown that by applying this network streaming technique, holographic data of 3-D moving objects are transmitted in high quality, and a relatively good reconstruction of the holographic images is performed. Moreover, it suggests that if this network streaming technique is employed together with MPEG-4, a new transmitting process for holographic information of 3-D moving objects may be rigorously developed over network systems, and will play a very important role in this field.
KEYWORDS: 3D image processing, JPEG2000, Computer generated holography, Holography, Image compression, Holograms, Image processing, Digital holography, 3D displays, Data compression
In this paper, the quality of recovered holographic images produced by CGH adopted JPEG2000 is investigated. As a result, it is observed that this process gives nice 3D reconstructed images. It appears to show that a transmission of 3D holographic images can be possible.
KEYWORDS: Particles, 3D displays, 3D image reconstruction, 3D image processing, Distortion, Control systems, Light scattering, Holography, Scattering, Digital micromirror devices
Recently, many type 3D display are now being developed. We have developed a electro-holographic display system using water particle 3D screen. However, a reconstructed image on water particle 3D screen was not clear because it was flickered by gravity and flow. By our research, flicker was reduced using flow controlled nozzle. We want to watch 3D moving image with little distortion and more expanded depth, hence, we have developed an array of water particle 3D screen.
KEYWORDS: 3D image reconstruction, 3D image processing, 3D displays, Particles, Holograms, Digital micromirror devices, Scattering, RGB color model, Light scattering, Computer generated holography
The specification of hologram image is the full parallax 3D image. In this case we can get more natural 3D image because focusing and convergence are coincident each other. We try to get practical electro-holography system because for conventional electro-holography the image viewing angle is very small. This is due to the limited display pixel size. Now we are developing new method
for large viewing angle by space projection method. White color laser is irradiated to single DMD panel (time shared CGH of RGB three colors). 3D space screen constructed by very small water
particle is used to reconstruct the 3D image with large viewing angle by scattering of water particle.
Recently many kinds of transmitting techniques have been developed, and a communicating network system with a very high transmission-rate has been constructed. Broad-band internet system may be one of the most useful communicating network systems. In this paper, a transmitting process of holographic 3D moving pictures accompanied by stereo sounds over the communicating network system is presented. It involves a transmitting technique of the hologram, in which holographic information of 3D moving pictures are recorded as fringe patterns. First, the information in the hologram is transformed into a bit stream data, and then it is transmitted over the internet system with stereo sound wave. We call it simply as "network streaming technique". It is shown that by an application of this technique, the holographic data of 3D moving pictures are transmitted in high quality, and relatively good reconstruction of holographic images are performed with nice stereo sounds. It suggests that based on "network streaming technique", a new transmitting process of holographic 3D moving pictures employed MPEG-4 and stereo sound wave can be rigorously developed, and it seems to play an important role in the transmission of 3D moving pictures accompanied by stereo sounds over the network.
KEYWORDS: Particles, 3D displays, 3D image reconstruction, Light scattering, 3D image processing, Holograms, Control systems, Mie scattering, Scattering, Transparency
Recently, image quality is improved by the research of sensation of reality that feeling of being at a live performance. We are developing electro-holographic display system using water particle 3D screen. It was cleared that water particle screen shows high contrast image with wide viewing angle and it is effective for holographic TV but it shows flickers by gravity and flow. Our research made flickers being reduced using flow controlled nozzle
Recently, because the high-speed network system known as broadband internet has become widespread, it is now possible to transmit various forms of mulitmedia data using this system. We found several research reports for the transmitting visual images in the network streaming process. However, there seemed to be few reports on transmission of holographic 3D movies. We present a transmitting process of holographic 3D movies adopting network-streaming techniques and a hologram in which 3D objects were recorded as fringe patterns. When we applied this method, we could achieve excellent transmission of holographic 3D movies. Moreover, we could reconstruct good holographic images using transmitted streaming data. From this result, it seemed possible to develop new transmitting processes of 3D moving data using well-known conventional techniques.
In order to develop a holographic HMD-type holography 3D-TV with a full parallax, it seems to be very useful to study various techniques of virtual image reconstruction sufficiently. In this paper, a new, full color electro-holographic display system equipped with LED is presented. Virtual image reconstructing technique is applied, and full color, relatively highly contrasted 3D images are obtained using this system. We consider about the condition for realization of HMD-type holography 3D-TV using this technique because this techniques is very suitable for HMD system.
KEYWORDS: 3D image reconstruction, 3D image processing, Particles, Holograms, 3D displays, Digital micromirror devices, RGB color model, Scattering, Computer generated holography, LCDs
The specification of hologram image is the full parallax 3D image. In this case we can get more
natural 3D image because focusing and convergence are coincident each other. We try to get
practical electro-holography system because for conventional electro-holography the image viewing
angle is very small. This is due to the limited display pixel size. Now we are developing new method
for large viewing angle by space projection method. White color laser is irradiated to single DMD
panel ( time shared CGH of RGB three colors ). 3D space screen constructed by very small water
particle is used to reconstruct the 3D image with large viewing angle by scattering of water particle.
A new and practical method for achieving color electro-holographic display systems was developed and tested with very promising results. In proposal method, virtual image reconstruction method and color hologram reconstruction techniques utilizing a single white light source, instead of the traditional three color laser lights, and three liquid crystal display panels (LCD) were proposed.. In this method imaging lens is not necessary and we can get wide viewing angle.
A metal halide lamp with good specifications in each wavelength of the color components was adopted as the light source. Each of the three color light components required for the reconstruction of an image was extracted by color separation using dichroic mirrors. The separated color images were then reconstructed by the hologram formed on the LCD panels which is then combined togethre through the use of a prism to form a single 3D image. As the result system become compact and realistic one.
A new and practical method for achieving Color Electro- Holographic Display systems was developed and tested with very promising results. In this method, holography techniques utilizing a single white light source, instead of the traditional three color laser lights, and three liquid crystal display panels (LCD) were proposed. A metal halide lamp with good specifications in each wavelength of the color components was adopted as the light source. Each of the three color light components required for the reconstruction of an image was extracted by color separation using dichroic mirrors. The separate color images were then reconstructed by the hologram formed on the LCD panels which is then combined together through eh use of a prism to form a single 3D image. Moreover, in proposal method, no lens are used by virtual-image-reconstruction. System size was reduced so far in 40 percent of the techniques by the proposal technique.
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