Nobuaki Usui
Fujitsu
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Publication
Featured researches published by Nobuaki Usui.
international symposium on algorithms and computation | 2007
Tetsuo Asano; Shinnya Bitou; Mitsuo Motoki; Nobuaki Usui
This paper presents an algorithm for rotating a subimage in place without using any extra working array. Due to this constraint, we have to overwrite pixel values by interpolated values. Key ideas are local reliability test which determines whether interpolation at a pixel is carried out correctly without using interpolated values, and lazy interpolation which stores interpolated values in a region which is never used for output images and then fills in interpolated values after safety is guaranteed. It is shown that linear interpolation is always safely implemented. An extension to cubic interpolation is also discussed.
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences | 2008
Tetsuo Asano; Shinnya Bitou; Mitsuo Motoki; Nobuaki Usui
This paper presents an algorithm for rotating a subimage in place without using any extra working array. Due to this constraint, we have to overwrite pixel values by interpolated values. Key ideas are local reliability test which determines whether interpolation at a pixel is carried out correctly without using interpolated values, and lazy interpolation which stores interpolated values in a region which is never used for output images and then fills in interpolated values after safety is guaranteed. It is shown that linear interpolation is always safely implemented. An extension to cubic interpolation is also discussed.
ITCom 2001: International Symposium on the Convergence of IT and Communications | 2001
Satoshi Iwata; Nobuaki Usui; Shoji Suzuki
We developed a new method for character generation that makes reading super fine characters (under 5 points) on a flat panel display easy. We removed the jaggy edges of a character image by subdividing the character image dots into the dots which size is one third as small as the original ones. This method is based on two characteristics of the human eye. These characteristics allowed us to map the subdivided value into display sub pixels and adjust the digital counts of sub pixels. We conducted a subjectivity evaluation experiment to evaluate the effectiveness of this method and found that the method is effective.
Archive | 2002
Junichi Odagiri; Nobuaki Usui; Shoji Suzuki
Archive | 1993
Shigeaki Shimazu; Tetsuo Asano; Nobuaki Usui; Kazuhiro Nakai
Archive | 2001
Satoshi Iwata; Shoji Suzuki; Nobuaki Usui
Archive | 2000
Nobuaki Usui; Junichi Odagiri
Archive | 2002
Nobuaki Usui
Archive | 2002
Nobuaki Usui; Akiko Nagae
Archive | 2001
Akiko Nagae; Nobuaki Usui; Tetsuo Asano
Collaboration
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