Abstract
Conventional voltage-based CMOS image sensors inherently have a dynamic range of about 60 dB. To extend the dynamic range, a two-degree of freedom time-based CMOS image sensor is proposed. Instead of reading analog voltages off chip, a time representation is used to record when the photodetector voltage passes a timing-varying threshold. The time measurements are combined with the reference voltage waveform to reconstruct the image. Experimental results on a prototype 32 x 32-pixel array CMOS image sensor verify that the two-degree of freedom sampling technique is feasible for ultra-wide dynamic range imaging. A measured 115 dB dynamic range at 30 fps is obtained.
Recommended Citation
Q. Luo et al., "A Time-to-first Spike CMOS Image Sensor With Coarse Temporal Sampling," Analog Integrated Circuits and Signal Processing, vol. 47, no. 3, pp. 303 - 313, Springer, Jun 2006.
The definitive version is available at https://doi.org/10.1007/s10470-006-5676-5
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
CMOS image sensor; Dynamic range; Time-based sampling
International Standard Serial Number (ISSN)
1573-1979; 0925-1030
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Springer, All rights reserved.
Publication Date
01 Jun 2006
