Experiment on digital CDS with 33-M pixel 120-fps super hi-vision image sensor

J. Yonai; T. Yasue; K. Kitamura; T. Hayashida; T. Watabe; H. Shimamoto; S. Kawahito

doi:10.1117/12.2038716

4 March 2014 Experiment on digital CDS with 33-M pixel 120-fps super hi-vision image sensor

J. Yonai, T. Yasue, K. Kitamura, T. Hayashida, T. Watabe, H. Shimamoto, S. Kawahito

Proceedings Volume 9022, Image Sensors and Imaging Systems 2014; 90220B (2014) https://doi.org/10.1117/12.2038716
Event: IS&T/SPIE Electronic Imaging, 2014, San Francisco, California, United States

Abstract

We have developed a CMOS image sensor with 33 million pixels and 120 frames per second (fps) for Super Hi-Vision (SHV:8K version of UHDTV). There is a way to reduce the fixed pattern noise (FPN) caused in CMOS image sensors by using digital correlated double sampling (digital CDS), but digital CDS methods need high-speed analog-to-digital conversion and are not applicable to conventional UHDTV image sensors due to their speed limit. Our image sensor, on the other hand, has a very fast analog-to-digital converter (ADC) using “two-stage cyclic ADC” architecture that is capable of being driven at 120-fps, which is double the normal frame rate for TV. In this experiment, we performed experimental digital CDS using the high-frame rate UHDTV image sensor. By reading the same row twice at 120-fps and subtracting dark pixel signals from accumulated pixel signals, we obtained a 60-fps equivalent video signal with digital noise reduction. The results showed that the VFPN was effectively reduced from 24.25 e^-_rms to 0.43 e^-_rms.

Citation Download Citation

J. Yonai, T. Yasue, K. Kitamura, T. Hayashida, T. Watabe, H. Shimamoto, and S. Kawahito "Experiment on digital CDS with 33-M pixel 120-fps super hi-vision image sensor", Proc. SPIE 9022, Image Sensors and Imaging Systems 2014, 90220B (4 March 2014); https://doi.org/10.1117/12.2038716

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KEYWORDS

Cadmium sulfide

Image sensors

Video

Digital electronics

Data conversion

Analog electronics

Digital signal processing

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