Title :
A time-based CMOS image sensor
Author :
Luo, Qiang ; Harris, John G.
Author_Institution :
Comput. Neuro-Eng. Lab., Florida Univ., Gainesville, FL, USA
Abstract :
A two-degree of freedom time-based CMOS image sensor is proposed in this paper for wide dynamic range imaging. Instead of reading analog voltages off chip, a time representation is used to record when the photodetector voltage drops below a time-varying threshold. The time measurements and the reference voltage waveform are used to reconstruct the image. Experimental results verify that the two-degree of freedom sampling technique is feasible for wide dynamic range imaging in video mode.
Keywords :
CMOS image sensors; image reconstruction; image sampling; photodetectors; image reconstruction; photodetector voltage drop; reference voltage waveform; sampling method; time based CMOS image sensor; time measurement; time representation; time varying threshold; video mode; wide dynamic range imaging; Bandwidth; CMOS image sensors; CMOS process; Dynamic range; Image sampling; Photodetectors; Pixel; Power supplies; Threshold voltage; Time measurement;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1329135
