A UHDTV Camera System With Multiplane Phase-Detection Autofocus

Metadata

Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: SMPTE Mot. Imag. J
Volume: 132, No. 2, pp. 32–39
Abstract: We propose a phase detection autofocus (PDAF) method for three-chip 8K (UHD-2) 240-frame/sec cameras that detects the in-focus position of a lens by using disparity information between pixels with different apertures across multiple sensors. This multiplane PDAF method executes pupil division in the same incident position while using simple metal-shielded pixel technology, which can achieve accurate AF and enable low-cost implementation. The proposed method implemented in a UHD-2 three-chip camera incorporating UHD-2 sensors with half-shielded phase-detection pixels into the blue and red channels demonstrated more robust disparity calculation than the conventional single-chip metal-shielded-based PDAF method.
Publication Date: 2023-03-01
DOI: 10.5594/JMI.2023.3236021
ISSN: Print: 1545-0279 | Electronic: 2160-2492
Link: https://doi.org/10.5594/JMI.2023.3236021
Author(s): Kodai Kikuchi
bio
Kodai Kikuchi received BE and ME degrees in electrical and electronic engineering from Chiba University, Chiba, Japan, in 2009 and 2011, respectively. He joined Japan Broadcasting Corp. (NHK), Tokyo, Japan, in 2011. Since 2013, he has been researching and developing ultrahigh-definition TV camera and recorder systems at NHK Science and Technology Research Laboratories (STRL), Tokyo. He is a member of the Institute of Image Information and Television Engineers of Japan (ITE).
Ryohei Funatsu
bio
Ryohei Funatsu received BE and ME degrees in electrical and electronic engineering from the Tokyo Institute of Technology, Tokyo, Japan, in 2000 and 2002, respectively. He joined NHK in 2002. From 2004 to 2021, he was engaged in research of ultrahigh-definition TV camera systems at NHK STRL, Tokyo. Since 2021, he has been engaged in the system design of broadcasting equipment in the Engineering Administration Department, Tokyo. He is a member of ITE.
Tomohiro Nakamura
bio
Tomohiro Nakamura is a research engineer in the Advanced Television Systems Research Division, NHK STRL. He is working on the research of ultrahigh-?definition television (UHDTV) systems. His research fields include the development of camera systems, image sensors, and digital signal processing. He joined NHK in 2008 after receiving a BE degree in electrical engineering and an ME degree in computer science and engineering from Waseda University, Tokyo, in 2006 and 2008, respectively. He has been engaged in research on UHDTV camera systems since 2012. He is a member of ITE.
Kohei Tomioka
bio
Kohei Tomioka received BE and ME degrees in engineering science from Kyoto University, Kyoto, Japan, in 2011 and 2013, respectively. In 2013, he joined NHK. He worked as a broadcasting engineer from 2013 to 2016. Since 2016, he has been with NHK STRL, where he has been engaged in the research and development of image sensors and cameras for the 8K super hi-vision. He is a member of ITE.
Takayuki Yamashita
bio
Takayuki Yamashita is the head of the Advanced Television Systems Research Division at NHK STRL, where he is responsible for exploring audio-visual technologies to enhance the immersiveness of viewers. He was working on the research, development, and standardization of television systems including UHD/HDR. He developed the world’s first 8K camera system in 2002 and the signal interface for the UHD-2 system in 2013. He joined NHK, Tokyo, in 1995 and has been engaged in research on camera systems for broadcasting since 1999. He received BE and ME degrees from the Kyoto Institute of Technology, Kyoto, Japan, in 1993 and 1995, respectively, and a DrEng degree from Ehime University, Matsuyama, Japan, in 2016. He is a member of SMPTE and ITE.
Keyword(s): High-speed Camera, Metal-shielded Sensor, Phase Detection Autofocus (PDAF), Three-chip Color Imaging, UHD-2
Copyright: © 2023 SMPTE

Bibliographic Reference(s)

8K 240-Hz Full-Resolution High-Speed Camera and Slow-Motion Replay Server Systems [Active]
R. Funatsu, H. Masuda, S. Nakamura, T. Yamashita, and H. Shimamoto, “High Visibility Focus-Aid Signal for UHDTV Cameras Using a Maximum Value Filter With Sparse Noise Reduction,” 2016 IEEE Int. Symp. Broadband Multimedia Syst. Broadcast., 4A-3, 2016. EXTERNAL
“Samsung Brings Enhanced Color Accuracy and Sharpness to Mobile Photos With New ISOCELL Plus Technology,” Samsung Press Release, Jun. 27, 2018. EXTERNAL
T. Yamasaki, T. Nakamura, R. Funatsu, and H. Shimamoto, “Hybrid Autofocus System by Using a Combination of the Sensor-Based Phase-Difference Detection and Focus-Aid Signal,” 2018 IEEE Int. Conf. Consumer Electronics, pp. 555–556, 2018. EXTERNAL
M. Kobayashi et al., “A Low Noise and High Sensitivity Image Sensor With Imaging and Phase-Difference Detection AF in All Pixels,” in 2015 Int. Image Sensor Workshop, pp. 123–128, 2018. EXTERNAL
T. Yasue et al., “A 2.1μm 33Mpixel CMOS Imager With Multi-Functional 3-Stage Pipeline ADC for 480fps High-Speed Mode and 120fps Low-Noise Mode,” 2018 IEEE Int. Solid-State Circuits Conf. Digest of Tech. Papers, DS1 5.6, pp. 90–91, 2018. EXTERNAL
W. M. Silver, “Normalized Correlation Search in Alignment, Gauging, and Inspection,” SPIE, 755:23–34, 1987. EXTERNAL
K. Kikuchi, T. Yasue, R. Funatsu, K. Tomioka, T. Matsubara, and T. Yamashita, “A Proposal of Sensor-Based Phase Detection Method in 3-CMOS 8K 240 fps Imaging,” Proc. SPIE, Ultra-High-Definition Imaging Systems III, vol. 11305, 2020. EXTERNAL
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J. Jang, Y. Yoo, J. Kim, and J. Paik, “Sensor-Based Auto-Focusing System Using Multi-Scale Feature Extraction and Phase Correlation Matching,” Sensors, 16:5747–5762, 2015. EXTERNAL
S. Yokogawa et al., “A 4M Pixel Full-PDAF CMOS Image Sensor With 1.58μm 2X1 On-Chip Micro-Split-Lens Technology,” in 2015 Int. Image Sensor Workshop, pp. 1–4, 2015. EXTERNAL
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ITU-R BT.2100-2 [Active]
SMPTE ST 2036-1:2014 [Active, Stabilized]

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Kodai Kikuchi, Ryohei Funatsu, Tomohiro Nakamura, Kohei Tomioka, and Takayuki Yamashita; A UHDTV Camera System With Multiplane Phase-Detection Autofocus, SMPTE Motion Imaging Journal ( Volume: 132, Issue: 2, March 2023); SMPTE, 2023. Available at https://doi.org/10.5594/JMI.2023.3236021

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Kodai Kikuchi, Ryohei Funatsu, Tomohiro Nakamura, Kohei Tomioka, and Takayuki Yamashita; A UHDTV Camera System With Multiplane Phase-Detection Autofocus, SMPTE Motion Imaging Journal ( Volume: 132, Issue: 2, March 2023); SMPTE, 2023. Available at https://doi.org/10.5594/JMI.2023.3236021

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<span class="citation">Kodai Kikuchi, Ryohei Funatsu, Tomohiro Nakamura, Kohei Tomioka, and Takayuki Yamashita; <cite>A UHDTV Camera System With Multiplane Phase-Detection Autofocus</cite>, SMPTE Motion Imaging Journal ( Volume: 132, Issue: 2, March 2023); SMPTE, 2023. Available at <a href="https://doi.org/10.5594/JMI.2023.3236021" target="_blank" rel="noopener">https://doi.org/10.5594/JMI.2023.3236021</a></span>

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Kodai Kikuchi, Ryohei Funatsu, Tomohiro Nakamura, Kohei Tomioka, and Takayuki Yamashita; A UHDTV Camera System With Multiplane Phase-Detection Autofocus, SMPTE Motion Imaging Journal ( Volume: 132, Issue: 2, March 2023); SMPTE, 2023
doi: 10.5594/JMI.2023.3236021
url: https://doi.org/10.5594/JMI.2023.3236021

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Kodai Kikuchi, Ryohei Funatsu, Tomohiro Nakamura, Kohei Tomioka, and Takayuki Yamashita; <cite id="bib-10-5594-jmi-2023-3236021">A UHDTV Camera System With Multiplane Phase-Detection Autofocus</cite>, SMPTE Motion Imaging Journal ( Volume: 132, Issue: 2, March 2023); SMPTE, 2023
<span class="doi">10.5594/JMI.2023.3236021</span>
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