title: Employment of frame accumulation and shaped function for upgrading low-light-level image detection sensitivity.
abstract: We demonstrate a novel method that employs a frame-accumulation and shaped-function technique to improve an image sensor's detection sensitivity using probability statistics. It can obtain the unbiased estimate for the low-light-level image signal, thus upgrading the signal-to-noise ratio to a high degree. It was verified by an experiment in a sealed box. By the help of a variable light beam-shaped function saw-tooth signal in front of a camera, the low-light-level shadow image that was invisible to the camera could be revealed clearly from the frame accumulation data. The method can surpass an image sensor's detection limitation.
authors.affiliation: State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.forename: Hongying
authors.initials: H
authors.lastname: Tang
authors.forename: Dongsung
authors.initials: D
authors.lastname: Kim
authors.forename: Jean
authors.initials: J
authors.lastname: Gao
authors.forename: Ling
authors.initials: L
authors.lastname: Lin