WORKSHOP PAPER
Programmable Dynamic Range Extension up to 110 dB Based on Charge-Splitting Method with 4-Tap CMOS Image Sensor
Yu Feng1, Yusuke Tanihata2, Kamel Mars3, Keita Yasutomi4, Shoji Kawahito4, Keiichiro Kagawa
1Graduate School of Science and Technology, Shizuoka University, Hamamatsu, 432-8011, Japan
2Graduate School of Integrated Science and Technology, Shizuoka University, Hamamatsu, 432-8011, Japan
3Faculty of Science and Technology, Shizuoka Institute of Science and Technology, Fukuroi, 437-8555, Japan
4Research Institute of Electronics, Shizuoka University, Hamamatsu, 432-8011, Japan

Abstract

High dynamic range (HDR) imaging has seen increasing demand in automotive, security, and other fields, driven by the need to capture scenes with an extended dynamic range (DR) without compromising image quality. This work presents an HDR imaging system using a 4-tap CMOS image sensor (CIS) that employs a charge-splitting method to achieve HDR of up to 110 dB while effectively minimizing signal-to-noise ratio (SNR) degradation and motion artifacts. The system provides the ability to dynamically adjust the DR and optimize the SNR to meet different imaging requirements. In this work, the technique is extended to a 4-tap CIS to further improve the DR and explore its use in vein pattern measurement.
Year: 2025
Workshop: IISW
URL: https://doi.org/10.60928/kqtv-bwd8
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Keywords

High dynamic range, HDR imaging, CMOS image sensor, Charge-splitting method, Signal-to-noise ratio, Motion artifacts, Dynamic range (DR), Vein pattern measurement,

References

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[2]) M. Kamel, et al., "A 648 x 484-Pixel 4-Tap Hybrid Time-of-Flight Image Sensor with 8 and 12 Phase Demodulation for Long-Range Indoor and Outdoor Operations", in International Image Sensor Workshop, 2023.
[3]) N. Yoneyama et al., "Simultaneous imaging of shallow and deep tissues based on multi-line scanning", in Proc. of Photonics West 2024, Paper 12816-17, 2024.. https://doi.org/10.1117/12.3000865