A Method to Achieve High Dynamic Range in a CMOS Image Sensor Using Interleaved Row Readout

Thomas Wocial; Konstantin Stefanov; Bill Martin; John Barnes; Hugh Jones

doi:10.1109/JSEN.2022.3211152

A Method to Achieve High Dynamic Range in a CMOS Image Sensor Using Interleaved Row Readout

Thomas Wocial, Konstantin Stefanov, Bill Martin, John Barnes, Hugh Jones

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Abstract

We present a readout scheme for CMOS image sensors that can be used to achieve arbitrarily high dynamic range (HDR) in principle. The linear full well capacity (LFWC) in high signal regions was extended 50 times from 20 to 984 ke − via an interlaced row-wise readout order, while the noise floor remained unchanged in low signal regions, resulting in a 34-dB increase in DR. The peak signal-to-noise ratio (PSNR) is increased in a continuous fashion from 43 to 60 dB. This was achieved by summing user-selected rows that were read out multiple times. Centroiding uncertainties were lowered when template-fitting a projected pattern, compared to the standard readout scheme. Example applications are aimed at scientific imaging due to the linearity and PSNR increase.

Original language	English
Journal	IEEE Sensors Journal
Volume	22
Issue number	22
Early online date	6 Oct 2022
DOIs	https://doi.org/10.1109/JSEN.2022.3211152
Publication status	Published - 15 Nov 2022

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©2022 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/
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https://ieeexplore.ieee.org/document/9913335

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abstract = "We present a readout scheme for CMOS image sensors that can be used to achieve arbitrarily high dynamic range (HDR) in principle. The linear full well capacity (LFWC) in high signal regions was extended 50 times from 20 to 984 ke − via an interlaced row-wise readout order, while the noise floor remained unchanged in low signal regions, resulting in a 34-dB increase in DR. The peak signal-to-noise ratio (PSNR) is increased in a continuous fashion from 43 to 60 dB. This was achieved by summing user-selected rows that were read out multiple times. Centroiding uncertainties were lowered when template-fitting a projected pattern, compared to the standard readout scheme. Example applications are aimed at scientific imaging due to the linearity and PSNR increase.",

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AU - Stefanov, Konstantin

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AU - Barnes, John

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AB - We present a readout scheme for CMOS image sensors that can be used to achieve arbitrarily high dynamic range (HDR) in principle. The linear full well capacity (LFWC) in high signal regions was extended 50 times from 20 to 984 ke − via an interlaced row-wise readout order, while the noise floor remained unchanged in low signal regions, resulting in a 34-dB increase in DR. The peak signal-to-noise ratio (PSNR) is increased in a continuous fashion from 43 to 60 dB. This was achieved by summing user-selected rows that were read out multiple times. Centroiding uncertainties were lowered when template-fitting a projected pattern, compared to the standard readout scheme. Example applications are aimed at scientific imaging due to the linearity and PSNR increase.

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A Method to Achieve High Dynamic Range in a CMOS Image Sensor Using Interleaved Row Readout

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