Wide dynamic range imager with selective readout

Details Wide dynamic range imager with selective readout Wide dynamic range imager with selective readout

2006-10-10

2006-10-10

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C348S308000

Reexamination Certificate

active

07119317

ABSTRACT:
A wide dynamic range imager with a dual integration, selective readout operating method that requires only one readout chain. First signals from a row of pixels are digitized and stored into a memory after a first integration period. A flag is set and stored in the memory for each pixel that reached a threshold value during the first integration period. Second signals from the row are read after a second shorter integration period. If the pixel's corresponding flag bit was set, the second signal is stored (overwriting the first signal) and is subsequently used by processing circuitry to generate the appropriate pixel signal based on a full range signal and the second signal. Otherwise, the first signal is processed by the processing circuitry.

REFERENCES:
patent: 6307195 (2001-10-01), Guidash
patent: 6710804 (2004-03-01), Guidash
patent: 6741198 (2004-05-01), McIlrath
patent: 2004/0041077 (2004-03-01), Fossum
patent: 2004/0041927 (2004-03-01), Cho et al.
Orly Yadid-Pecht, et al., “Wide Intrascene Dynamic Range CMOS APS Using Dual Sampling”, IEEE Transactions on Electron Devices, vol. 44, No. 10, Oct. 1997.

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