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Nishi-Tokyo-shi, Japan

Mitsuishi M.,University of Tokyo | Morita A.,Nippon Telegraph and Telephone | Sugita N.,University of Tokyo | Sora S.,Tokyo Metropolitan Police Hospital | And 5 more authors.
International Journal of Medical Robotics and Computer Assisted Surgery | Year: 2013

Background: Microsurgery is a widely performed process in neurosurgery. However, it is difficult for surgeons because manipulating small and long instruments under a microscope often restricts dexterity. Hand tremors are also an issue, as the accuracy required for microsurgery is very high. Method: A master-slave robotic platform has been developed for neurosurgery. A position-orientation decoupled design was employed to enhance positioning accuracy, and a smooth trajectory generation method was developed. Result: The robotic tasks exhibited improved positioning accuracy compared to manual tasks. Anastomoses of 0.3 and 0.5 mm artificial vessels were successfully performed in end-to-end and end-to-side fashion. Conclusion: With the robotic platform, the surgeon was able to perform a fine and complex task, which is very difficult with manual operation. The robotic system showed sufficient accuracy and dexterity, but with a longer task completion time. Further improvement of the dexterity and user interface is expected to realize better performance. © 2012 John Wiley & Sons, Ltd. Source

Kanazawa M.,NHK Engineering Services Inc.
Proceedings of the International Display Workshops | Year: 2012

The relationship of the luminance and the color gamut for reflective type displays is investigated. It is shown that methods based on the human visual system other than the current RGB sub-pixel can have better luminance and color gamut. Source

Okano F.,NHK Engineering Services Inc. | Shishikui Y.,Science and Technology Research Laboratories
Proceedings of the IEEE | Year: 2012

Many engineers and researchers contributed towards the development of television since the successful experiments conducted by John Baird in the United Kingdom and Kenjiro Takayanagi in Japan in the 1920s. The research and development of television systems continued over the years culminating in the standardization of the NTSC, PAL, and SECAM formats as standard definition television (SDTV) systems. The motion picture, which was invented by the Lumiere brothers in 1895, has progressed dramatically since the invention of the television. It is now becoming possible to fabricate semiconductor devices, which form the basis of elemental technologies essential to video systems, at a submicrometer level of precision. If a new video system can be constructed exceeding the capabilities of HDTV, certainly it would bring many benefits in a wide range of fields. Science and Technology Research Laboratories has taken up the challenge of developing UHDTV as the system beyond HDTV, and it is called Super Hi-Vision. Source

Arai J.,NHK Japan Broadcasting Corporation | Kawakita M.,NHK Japan Broadcasting Corporation | Yamashita T.,NHK Japan Broadcasting Corporation | Sasaki H.,NHK Japan Broadcasting Corporation | And 4 more authors.
Optics Express | Year: 2013

Integral three-dimensional (3D) television based on integral imaging requires huge amounts of information. Previously, we constructed an Integral 3D television using Super Hi-Vision (SHV) technology, with 7680 pixels horizontally and 4320 pixels vertically. We report on improved image quality through the development of video system with an equivalent of 8000 scan lines for use with Integral 3D television. We conducted experiments to evaluate the resolution of 3D images using an experimental setup and were able to show that by using the pixel-offset method we have eliminated aliasing produced by full-resolution SHV video equipment. We confirmed that the application of the pixel-offset method to integral 3D television is effective in increasing the resolution of reconstructed images. © 2013 Optical Society of America. Source

Arai J.,NHK Japan Broadcasting Corporation | Yamashita T.,NHK Japan Broadcasting Corporation | Miura M.,NHK Japan Broadcasting Corporation | Hiura H.,NHK Japan Broadcasting Corporation | And 3 more authors.
Optics Letters | Year: 2013

We have developed a compact integral three-dimensional (3D) imaging equipment that positions the lens array and image sensor in close proximity to each other. In the conventional scheme, a camera lens is used to project the elemental images generated by the lens array onto the image sensor. In contrast, the imaging equipment presented here combines the lens array and image sensor into one unit and makes no use of a camera lens. This scheme eliminates the resolution deterioration and distortion caused by the use of a camera lens and improves, in principle, the quality of the reconstructed 3D image. We captured objects with this imaging equipment and displayed the reconstructed 3D images using display equipment consisting of a liquid crystal panel and a lens array. The reconstructed 3D images were found to have appropriate motion parallax. © 2013 Optical Society of America. Source

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