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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Yonai, J. Yonai, T. Yasue, T. Yasue, K. Kitamura, K. Kitamura, T. Hayashida, T. Hayashida, T. Watabe, T. Watabe, H. Shimamoto, H. Shimamoto, S. Kawahito, 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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