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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 33 — Nov. 20, 2013
  • pp: 7934–7941

Optimum method of applying and removing a shaped-function signal for low-light-level image detection

Gang Li, Longfei Zhao, Mei Zhou, Mengjun Wang, and Ling Lin  »View Author Affiliations

Applied Optics, Vol. 52, Issue 33, pp. 7934-7941 (2013)

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This paper presents an optimum method that exploits the principle of diffuse scattering and employs the least squares method (LSM) to apply and remove a shaped-function signal for low-light-level image detection. With the help of a sawtooth-shaped-function light signal applied to an image sensor, the LSM is employed to remove the sawtooth signal from the captured images and restore the weak image signal. The experiment process and result verify that this method can not only maintain the capability of upgrading the image sensor’s sensitivity and signal-to-noise ratio like the previous method, but it also can improve the imaging speed in the low-light level, decrease the computation cost of the extraction process, and eliminate the influence of the environment light to satisfy the requirement of long-distance detection.

© 2013 Optical Society of America

OCIS Codes
(040.1520) Detectors : CCD, charge-coupled device
(040.3780) Detectors : Low light level
(110.2970) Imaging systems : Image detection systems
(070.2025) Fourier optics and signal processing : Discrete optical signal processing

ToC Category:

Original Manuscript: September 12, 2013
Revised Manuscript: October 15, 2013
Manuscript Accepted: October 15, 2013
Published: November 13, 2013

Gang Li, Longfei Zhao, Mei Zhou, Mengjun Wang, and Ling Lin, "Optimum method of applying and removing a shaped-function signal for low-light-level image detection," Appl. Opt. 52, 7934-7941 (2013)

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