4 March 2014 Experiment on digital CDS with 33-M pixel 120-fps super hi-vision image sensor
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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.
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J. Yonai, T. Yasue, K. Kitamura, T. Hayashida, T. Watabe, H. Shimamoto, 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); doi: 10.1117/12.2038716; https://doi.org/10.1117/12.2038716
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