A Camera System Using Three 33-megapixel CMOS Image Sensors for UHDTV2

Yamashita, Takayuki; Funatsu, Ryohei; Yanagi, Tadaaki; Mitani, Kohji; Nojiri, Y.; Yoshida, Takaichi

doi:10.5594/j18117

Cited by 17 publications

(3 citation statements)

References 4 publications

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“…Recently, the resolution in video imaging systems has increased, resulting in 4K and 8K resolutions. , A complementary metal–oxide–semiconductor (CMOS) image sensor with a Bayer pattern color filter array (CFA) is mainly used in modern high-resolution cameras. Generally, when using the same sensor size, a smaller pixel size is needed to realize higher resolution sensors.…”

Section: Introductionmentioning

confidence: 99%

Color-Filter-Free Three-Layer-Stacked Image Sensor Using Blue/Green-Selective Organic Photoconductive Films with Thin-Film Transistor Circuits on CMOS Image Sensors

Sakai¹,

Takagi²,

Imamura³

et al. 2021

ACS Appl. Electron. Mater.

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In this paper, we describe a three-layer-stacked color image sensor comprising two organic photoconductive films (OPFs) with thin-film transistor-based readout circuits and a complementary metal–oxide–semiconductor (CMOS) image sensor. In this three-layer-stacked sensor, a blue-sensitive OPF selectively absorbs blue light, a green-sensitive OPF selectively absorbs green light, and a CMOS image sensor (CIS) receives red light. Color video imaging operation at 60 frames per second was confirmed for a prototype sensor having 320 × 240 pixels with a pixel pitch of 20 μm without a color filter array, and good color separation and a linear response of the sensor were achieved owing to the combination of the CIS and color-selective OPFs.

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Section: Introductionmentioning

confidence: 99%

Color-Filter-Free Three-Layer-Stacked Image Sensor Using Blue/Green-Selective Organic Photoconductive Films with Thin-Film Transistor Circuits on CMOS Image Sensors

Sakai¹,

Takagi²,

Imamura³

et al. 2021

ACS Appl. Electron. Mater.

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“…Solving this lens design only leads to a secondary design constraint, in that the total resolution of such wide-angle lenses can easily exceed 100 megapixels. This is beyond the current spatial resolution and communication bandwidth of a single cost-effective sensor [2], especially for video output at 30 frames ∕s or more.…”

mentioning

confidence: 99%

Optimization of two-glass monocentric lenses for compact panoramic imagers: general aberration analysis and specific designs

2012

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Monocentric lenses have recently changed from primarily a historic curiosity to a potential solution for panoramic high-resolution imagers, where the spherical image surface is directly detected by curved image sensors or optically transferred onto multiple conventional flat focal planes. We compare imaging and waveguide-based transfer of the spherical image surface formed by the monocentric lens onto planar image sensors, showing that both approaches can make the system input aperture and resolution substantially independent of the input angle. We present aberration analysis that demonstrates that wide-field monocentric lenses can be focused by purely axial translation and describe a systematic design process to identify the best designs for two-glass symmetric monocentric lenses. Finally, we use this approach to design an F/1.7, 12 mm focal length imager with an up to 160° field of view and show that it compares favorably in size and performance to conventional wide-angle imagers.

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“…Solving this lens design only leads to a secondary design constraint, in that the total resolution of such wide angle lenses can easily exceed 100 Megapixels. This is beyond the current spatial resolution and communications bandwidth of a single cost-effective sensor 2 , especially for video output at 30 frames per second or more.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal lens focusing in monocentric multiscale imagers

et al. 2012

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In multiscale imagers a single objective lens is shared by multiple secondary optical systems, so that a high-resolution wide-angle image is acquired in overlapping fields sensed by multiple conventional focal planes. In the "AWARE2" 2 Gigapixel imager, F/2.4 optics cover a 120 degree field of view using a monocentric glass primary lens shared by 221 molded plastic subimagers, each with a 14 Megapixel focal plane. Such imagers can independently focus parts of the image field, allowing wide-angle imaging over relatively close and deep image fields. However, providing hundreds of independent mechanical focus adjustments has a significant system impact in terms of complexity, bulk, and cost. In this paper we explore the use of an electronically controlled liquid crystal lens for focus of multiscale imagers in general, and demonstrate use with the AWARE2 imager optics. The Lens Vector Auto Focus (LVAF) liquid crystal lens provides up to 5 diopters of optical power over a 2.2mm aperture diameter, the maximum currently available aperture. However, a custom lens using the same materials and basic structure can provide the 5 diopters power and 6.4 mm aperture required to obtain full resolution overlapping image fields in the AWARE2 imager. We characterize the LVAF lens and the optical performance of the LVAF lens in the current AWARE2 prototype, comparing the measured and optically modeled resolution, and demonstrating software control of focus from infinity to an 2m object distance.

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A Camera System Using Three 33-megapixel CMOS Image Sensors for UHDTV2

Cited by 17 publications

References 4 publications

Color-Filter-Free Three-Layer-Stacked Image Sensor Using Blue/Green-Selective Organic Photoconductive Films with Thin-Film Transistor Circuits on CMOS Image Sensors

Color-Filter-Free Three-Layer-Stacked Image Sensor Using Blue/Green-Selective Organic Photoconductive Films with Thin-Film Transistor Circuits on CMOS Image Sensors

Optimization of two-glass monocentric lenses for compact panoramic imagers: general aberration analysis and specific designs

Liquid crystal lens focusing in monocentric multiscale imagers

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