Title :
Design based on two-frame composition for high dynamic range CMOS image sensor
Author :
Sang, Meizhen ; Xu, Jiangtao ; Yao, Suying
Author_Institution :
Sch. of Electron. & Inf. Eng., Tianjin Univ., Tianjin, China
Abstract :
An algorithm based on synthesis of two frame images is proposed to expand the dynamic range of CMOS image sensors. By changing the exposure time, a long-exposure and a short-exposure frame are captured and digitally integrated into one high dynamic range (HDR) image with the method of weighting summation. The exposure time can be adjusted according to the scene. The weighting factors are self-adapting to prevent pixel saturation and eliminate image flicker. Using long exposure time 24ms and short exposure time 3ms, the dynamic range is increased by 18dB, peak signal noise ratio (PSNR) can reach to 19.1850, and signal to noise ratio (SNR) is 14.6527. Results show that the dynamic range gain is between 13dB and 32dB without SNR and PSNR reduced.
Keywords :
CMOS image sensors; HDR CMOS image sensors; PSNR; gain 13 dB; gain 32 dB; high dynamic range CMOS image sensor; long-exposure frame; peak signal noise ratio; short-exposure frame; time 3 ms; two frame images; two-frame composition; CMOS image sensors; Dynamic range; Heuristic algorithms; Mathematical model; PSNR; Signal processing algorithms; Dynamic range; Exposure time; PSNR; Weighting factor;
Conference_Titel :
Electron Devices and Solid-State Circuits (EDSSC), 2011 International Conference of
Conference_Location :
Tianjin
Print_ISBN :
978-1-4577-1998-1
Electronic_ISBN :
Pending
DOI :
10.1109/EDSSC.2011.6117736
