We applied an autostereoscopic display based on the integral imaging method (II method) to training equipment for
medical treatment in an attempt to recover the binocular vision performance of strabismus or amblyopia (lazy eye)
patients. This report summarizes the application method and results. The point of the training is to recognize the parallax
using both eyes. The strabismus or amblyopia patients have to recognize the information on both eyes equally when they
gaze at the display with parallax and perceive the stereo depth of the content. Participants in this interactive training
engage actively with the image. As a result, they are able to revive their binocular visual function while playing a game.
Through the training, the observers became able to recognize the amount of parallax correctly. In addition, the training
level can be changed according to the eyesight difference between a right eye and a left eye. As a result, we ascertained
that practical application of the II method for strabismus or amblyopia patients would be possible.
We developed an autostereoscopic display based on the integral imaging (II) method to give horizontal parallax .
There is anxiety concerning the possibility of visual fatigue associated with stereoscopic images. This report summarizes
the evaluation results. Ease of viewing and the fatigue associated with the stereoscopic vision were evaluated subjectively and objectively . As a result, viewing stereoscopic images displayed by the II method was found to be easier than viewing images displayed by a conventional binocular method. There was no significant difference between fatigue in the case of stereoscopic vision with the II method and that in the case of viewing conventional 2D image. In addition, we reported the result of a medical safety evaluation .
We have developed prototypes of flatbed-type autostereoscopic display systems using one-dimensional integral imaging
method. The integral imaging system reproduces light beams similar of those produced by a real object. Our display
architecture is suitable for flatbed configurations because it has a large margin for viewing distance and angle and has
continuous motion parallax. We have applied our technology to 15.4-inch displays. We realized horizontal resolution of
480 with 12 parallaxes due to adoption of mosaic pixel arrangement of the display panel. It allows viewers to see high
quality autostereoscopic images. Viewing the display from angle allows the viewer to experience 3-D images that stand
out several centimeters from the surface of the display. Mixed reality of virtual 3-D objects and real objects are also
realized on a flatbed display. In seeking reproduction of natural 3-D images on the flatbed display, we developed
proprietary software. The fast playback of the CG movie contents and real-time interaction are realized with the aid of a
graphics card. Realization of the safety 3-D images to the human beings is very important. Therefore, we have measured
the effects on the visual function and evaluated the biological effects. For example, the accommodation and convergence
were measured at the same time. The various biological effects are also measured before and after the task of watching
3-D images. We have found that our displays show better results than those to a conventional stereoscopic display. The
new technology opens up new areas of application for 3-D displays, including arcade games, e-learning, simulations of
buildings and landscapes, and even 3-D menus in restaurants.
An optical head and a fast laser power control electro-optics using short wavelength laser diode was developed. This laser power control method reduces much of the laser noise, and, at the same time, rapidly regulate the laser power in order to compensate for mark shape. The relative intensity noise of the laser, lasing at 670 nm, was reduced -127 dB/Hz. This noise level is enough low to use the short wavelength laser diode for high density recording. This method is able to set various writing power waveforms to avoid mark distortion. The recorded mark shapes were got in case of (1,7) mark edge modulation, the minimum mark length is 0.8 micrometers . This high recording density is equivalent to 1.7 bit/micrometers .