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Nagaaki Ohyama
Researcher at Tokyo Institute of Technology
Publications - 258
Citations - 4721
Nagaaki Ohyama is an academic researcher from Tokyo Institute of Technology. The author has contributed to research in topics: Color image & Image processing. The author has an hindex of 32, co-authored 258 publications receiving 4480 citations. Previous affiliations of Nagaaki Ohyama include National Institute of Information and Communications Technology.
Papers
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Journal ArticleDOI
Appearance of enhanced tissue features in narrow-band endoscopic imaging.
Kazuhiro Gono,Takashi Obi,Masahiro Yamaguchi,Nagaaki Ohyama,Hirohisa Machida,Yasushi Sano,Shigeaki Yoshida,Yasuo Hamamoto,Takao Endo +8 more
TL;DR: The results of clinical tests in colonoscopy and esophagoscopy indicated that NBI will be useful as a supporting method for observation of the endoscopic findings of early cancer.
Journal ArticleDOI
Endoscopic observation of tissue by narrowband illumination
Kazuhiro Gono,Kenji Yamazaki,Nobuyuki Doguchi,Tetsuo Nonami,Takashi Obi,Masahiro Yamaguchi,Nagaaki Ohyama,Hirohisa Machida,Yasushi Sano,Shigeaki Yoshida,Yasuo Hamamoto,Takao Endo +11 more
TL;DR: A new illumination method for a medical endoscope: narrow band imaging (NBI), in which the spectral bandwidth of the filtered light is narrowed, which has been shown that NBI can enhance the capillary pattern and the crypt pattern on the mucosa.
Patent
Color image processing apparatus
TL;DR: A color image processing apparatus reproduces color data of a subject at higher accuracy by estimating the spectral reflectance of the subject from the color chip basis function vn (λ).
Proceedings ArticleDOI
Color image reproduction based on multispectral and multiprimary imaging: experimental evaluation
Masahiro Yamaguchi,Taishi Teraji,Kenro Ohsawa,Toshio Uchiyama,Hideto Motomura,Yuri Murakami,Nagaaki Ohyama +6 more
TL;DR: It is confirmed that the 6-primary display gives improved agreement between the original and reproduced colors, and the color reproduction results with different spectral distributions but same CIE tristimulus value are visually compared.
Proceedings ArticleDOI
Phase-added stereogram: calculation of hologram using computer graphics technique
TL;DR: Applying PAS, computer graphics techniques, for example, surface shading and hidden surface removal are easily applied in CGH generation process and the amount of computation is reduced compared with actual hologram calculation, and the quality of reconstructed image is superior to that of holographic stereogram.