title: Note: Improving low-light-level image detection sensitivity with higher speed using auxiliary sinusoidal light signal.
abstract: An improved active imaging method, which upgraded the detection sensitivity by applying an auxiliary sawtooth wave light signal, was reported. Nevertheless, such method sacrificed the imaging speed. To speed up imaging, a sinusoidal light signal is used instead and superposed with the undetectable low-light-level signal on the image sensor. After acquiring a superimposed image set in one sine wave cycle, an unbiased low-light-level image estimation is obtained by using least-square optimization. Through probabilistic analysis and experimental study, we demonstrate that the sinusoidal signal could improve the detection sensitivity 1/3 faster than the sawtooth wave signal.
authors.affiliation: Key Lab of Computer Technologies Application of Yunnan Province, School of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, China.
authors.forename: Hongying
authors.initials: H
authors.lastname: Tang
authors.affiliation: Key Lab of Computer Technologies Application of Yunnan Province, School of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, China.
authors.forename: Zhengtao
authors.initials: Z
authors.lastname: Yu