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Takayuki Yamashita - IEEE Xplore Author Profile
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Takayuki Yamashita

Also published under: T. Yamashita

Publications
27
Citations
326
Publications by Year
20022023
Co-Authors:
Show All Co-Authors (70)
Image of author Takayuki Yamashita

Takayuki Yamashita

Also published under: T. Yamashita

Affiliation

NHK Science and Technology Research Laboratories, Tokyo, Japan

Publication Topics

Biography

Takayuki Yamashita received the B.E. and M.E. degrees in electronic engineering and information science from Kyoto Institute of Technology, Kyoto, Japan, in 1993 and 1995, respectively.,He joined NHK in 1995, where he is a senior research engineer for the Advanced Television Systems Research Division of NHK STRL. Currently, he is researching UHDTV systems and his fields of interest include the development of camera systems, image sensors, and high-bandwidth digital signal processing and transmission systems. He also has an interest in researching capturing systems for next-generation 3DTV. He has been engaged in research on HDTV camera systems since 1999.,Mr. Yamashita is a member of SMPTE and the Institute of Image Information and Televisi...
Publications
27
Citations
326
Publications by Year
20022023
Co-Authors:
Show All Co-Authors (70)
Author's Published Works

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Improved Correlated Multiple Sampling by Using Interleaved Pixel Source Follower for High-Resolution and High-Framerate CMOS Image Sensor

Kohei Tomioka;Toshio Yasue;Ryohei Funatsu;Kodai Kikuchi;Tomoki Matsubara;Takayuki Yamashita;Shoji Kawahito

IEEE Transactions on Electron Devices
Year: 2021 | Volume: 68, Issue: 5 | Journal Article |
Cited by: Papers (6)
This article describes an improvement in the noise reduction performance of a column correlated multiple sampling (CMS) readout circuit using interleaved pixel source follower for high-resolution and high-framerate CMOS image sensors (CISs). In this architecture, the time-interleaved operation of the two pixel source followers reduces the restrictions imposed by the settling time of the pixel sour...Show More

Improved Correlated Multiple Sampling by Using Interleaved Pixel Source Follower for High-Resolution and High-Framerate CMOS Image Sensor

Kohei Tomioka;Toshio Yasue;Ryohei Funatsu;Kodai Kikuchi;Tomoki Matsubara;Takayuki Yamashita;Shoji Kawahito

Year: 2021 | Volume: 68, Issue: 5 | Journal Article |

Multi-Plane Phase Detection Autofocus for 8K Three-Chip Color Imaging Cameras

Kodai Kikuchi;Ryohei Funatsu;Toshio Yasue;Kohei Tomioka;Tomoki Matsubara;Takayuki Yamashita

2020 IEEE 9th Global Conference on Consumer Electronics (GCCE)
Year: 2020 | Conference Paper |
A phase detection (PD) autofocus (AF) method for three-chip color imaging cameras is proposed. The method detects the focus state of a lens by calculating the disparity between a half-shielded PD pixel and other normal pixels corresponding to the same incident position among three sensors, which can perform accurate AF without employing state-of-the-art dual-photodiode technology. By using a proto...Show More

Multi-Plane Phase Detection Autofocus for 8K Three-Chip Color Imaging Cameras

Kodai Kikuchi;Ryohei Funatsu;Toshio Yasue;Kohei Tomioka;Tomoki Matsubara;Takayuki Yamashita

Year: 2020 | Conference Paper |

Noise Reduction Effect of Folding-integration ADC in an 8K Image Sensor driven at Various Frame Rates

Kohei Tomioka;Toshio Yasue;Ryohei Funatsu;Kodai Kikuchi;Tomoki Matsubara;Takayuki Yamashita;Shoji Kawahito

2020 IEEE SENSORS
Year: 2020 | Conference Paper |
Cited by: Papers (1)
This paper describes the noise reduction effect of a folding-integration (FI) ADC applied to an 8K image sensor. To maximize the sampling number in correlated multiple sampling (CMS), we implement duplicated pixel source followers, which are operated alternately to reduce the time needed for them to settle. This architecture facilitates sampling numbers of 6, 14, and 30 at 120, 60, and 30 fps, res...Show More

Noise Reduction Effect of Folding-integration ADC in an 8K Image Sensor driven at Various Frame Rates

Kohei Tomioka;Toshio Yasue;Ryohei Funatsu;Kodai Kikuchi;Tomoki Matsubara;Takayuki Yamashita;Shoji Kawahito

Year: 2020 | Conference Paper |

Progress Overview of Capturing Method for Integral 3-D Imaging Displays

Jun Arai;Eisuke Nakasu;Takayuki Yamashita;Hitoshi Hiura;Masato Miura;Tomohiro Nakamura;Ryohei Funatsu

Proceedings of the IEEE
Year: 2017 | Volume: 105, Issue: 5 | Journal Article |
Cited by: Papers (19)
An integral 3-D technique provides a 3-D spatial image viewable from varying positions without the use of special light sources or viewing glasses. Therefore, this technique shows promise for diverse applications in various fields, including 3-D television broadcasting, advertising, and medical diagnostics. However, there are problems in capturing and displaying large amounts of information in rea...Show More

Progress Overview of Capturing Method for Integral 3-D Imaging Displays

Jun Arai;Eisuke Nakasu;Takayuki Yamashita;Hitoshi Hiura;Masato Miura;Tomohiro Nakamura;Ryohei Funatsu

Year: 2017 | Volume: 105, Issue: 5 | Journal Article |

High-visibility focus-aid signal for ultra-high-definition television cameras using maximum value filter with sparse noise reduction

Ryohei Funatsu;Hiroyasu Masuda;Shinichiro Nakamura;Takayuki Yamashita;Hiroshi Shimamoto

2016 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)
Year: 2016 | Conference Paper |
Cited by: Papers (3)
The demand for ultra-high-definition television (UHDTV) content is increasing rapidly every year owing to the prevalence of 4K TV sets and the launch of 4K/8K broadcasting services. In UHDTV content production, the difficulty of focusing high-resolution cameras has become one of the most critical issues. We previously proposed a focus-aid signal for use in 8K UHDTV cameras, which facilitated preci...Show More

High-visibility focus-aid signal for ultra-high-definition television cameras using maximum value filter with sparse noise reduction

Ryohei Funatsu;Hiroyasu Masuda;Shinichiro Nakamura;Takayuki Yamashita;Hiroshi Shimamoto

Year: 2016 | Conference Paper |

Algorithm Design for Gamut Mapping From UHDTV to HDTV

Kenichiro Masaoka;Yuichi Kusakabe;Takayuki Yamashita;Yukihiro Nishida;Tetsuomi Ikeda;Masayuki Sugawara

Journal of Display Technology
Year: 2016 | Volume: 12, Issue: 7 | Journal Article |
With the advent of Recommendation ITU-R BT.2020 (Rec. 2020) color space for ultra-high definition television (UHDTV), the development of a gamut mapping algorithm for wide to standard gamuts is greatly needed. In wide-gamut UHDTV production, particularly under the assumption of simultaneous live UHDTV and high-definition television (HDTV) broadcast scenarios, real-time gamut mapping from UHDTV to ...Show More

Algorithm Design for Gamut Mapping From UHDTV to HDTV

Kenichiro Masaoka;Yuichi Kusakabe;Takayuki Yamashita;Yukihiro Nishida;Tetsuomi Ikeda;Masayuki Sugawara

Year: 2016 | Volume: 12, Issue: 7 | Journal Article |

6.2 133Mpixel 60fps CMOS image sensor with 32-column shared high-speed column-parallel SAR ADCs

Ryohei Funatsu;Steven Huang;Takayuki Yamashita;Kevin Stevulak;Jeff Rysinski;David Estrada;Shi Yan;Takuji Soeno;Tomohiro Nakamura;Tetsuya Hayashida;Hiroshi Shimamoto;Barmak Mansoorian

2015 IEEE International Solid-State Circuits Conference - (ISSCC) Digest of Technical Papers
Year: 2015 | Conference Paper |
To realize next-generation highly realistic sensation broadcasting systems, the research and development of 8K ultrahigh-definition television (UHDTV) systems have been promoted. To realize 8K video cameras, 33Mpixel sensors [1-2] and a full-resolution camera system that uses three 33Mpixel sensors [3] have been reported. However, the weight of the camera with three sensors is over 40kg because th...Show More

6.2 133Mpixel 60fps CMOS image sensor with 32-column shared high-speed column-parallel SAR ADCs

Ryohei Funatsu;Steven Huang;Takayuki Yamashita;Kevin Stevulak;Jeff Rysinski;David Estrada;Shi Yan;Takuji Soeno;Tomohiro Nakamura;Tetsuya Hayashida;Hiroshi Shimamoto;Barmak Mansoorian

Year: 2015 | Conference Paper |

8K Extremely-High-Resolution Camera Systems

Takayuki Yamashita;Kohji Mitani

Proceedings of the IEEE
Year: 2013 | Volume: 101, Issue: 1 | Journal Article |
Research and development of ultrahigh-definition imaging systems that go beyond high-definition television (HDTV) have converged in the field of “4K” and “8K” imaging systems. The 4K imaging systems are used for digital cinema, while the 8K systems have been developed for use in next-generation TV broadcasting systems. The latter at 60 frames/s represents the highest pixel count and frame rate of ...Show More

8K Extremely-High-Resolution Camera Systems

Takayuki Yamashita;Kohji Mitani

Year: 2013 | Volume: 101, Issue: 1 | Journal Article |

Advanced Camera Technologies for Broadcasting

Hiroshi Shimamoto;Takayuki Yamashita;Misao Kubota;Hirotaka Maruyama

IEEE Micro
Year: 2011 | Volume: 31, Issue: 6 | Magazine Article |
Cited by: Papers (3)
NHK, the Japan broadcasting corporation, has developed many camera technologies for broadcasting. This article focuses on three of their latest innovations: An 8,000-pixel by 4,000-line high-resolution camera, a high-speed camera that captures images at up to 1 million frames per second, and a high-sensitivity camera that is 50 times more sensitive than conventional broadcasting charge-coupled dev...Show More

Advanced Camera Technologies for Broadcasting

Hiroshi Shimamoto;Takayuki Yamashita;Misao Kubota;Hirotaka Maruyama

Year: 2011 | Volume: 31, Issue: 6 | Magazine Article |

Development of a microwave receiving and transmission system using an optical modulator

T. Yamashita;K. Haeiwa;T. Negishi;I. Murasaki;Y. Toba;M. Onizawa

2005 IEEE International Symposium on Circuits and Systems (ISCAS)
Year: 2005 | Conference Paper |
Cited by: Papers (1) | Patents (2)
This article describes the development and construction of an evolutional SHF band signal receiving and transmission system using an optical modulator that operates via a faint signal in the 3.4GHz band. The modulator is a LiNbO/sub 3/ optical modulator of Mach-Zehnder type, which can be used to modulate a light beam at 1.5 /spl mu/m with FM signals at 3.4GHz band and a voltage level of 60dB/spl m...Show More

Development of a microwave receiving and transmission system using an optical modulator

T. Yamashita;K. Haeiwa;T. Negishi;I. Murasaki;Y. Toba;M. Onizawa

Year: 2005 | Conference Paper |

Optical RF-TV signal sensing and transmission for terrestrial TV relaying stations

K. Haeiwa;T. Yamashita;Y. Takeuchi;Y. Toba;S. Torihata;M. Onizawa

Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344)
Year: 2002 | Conference Paper |
Cited by: Patents (2)
An evolutional optical RF-TV signal sensing and transmitting facilities were constructed and employed for a new type of TV relaying station. A LiNbO/sub 3/ optical modulator of Mach-Zehnder type at 1.3 /spl mu/m, which was used to modulate a light beam at 1.3 /spl mu/m with digital terrestrial television (OFDM) signals at a 470 MHz through 770 MHz band with a power level of 36 dB /spl mu/V obtaine...Show More

Optical RF-TV signal sensing and transmission for terrestrial TV relaying stations

K. Haeiwa;T. Yamashita;Y. Takeuchi;Y. Toba;S. Torihata;M. Onizawa

Year: 2002 | Volume: 1 | Conference Paper |

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