Author： Luo Qiang Harris John Chen Zhiliang
Publisher： Springer Publishing Company
ISSN： 0925-1030
Source： Analog Integrated Circuits and Signal Processing, Vol.47, Iss.3, 2006-06, pp. : 303-313
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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 × 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.
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