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Takayuki Yamashita - IEEE Xplore Author Profile

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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
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
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
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
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
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
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
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
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
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
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