Open AccessSingle-event transient imaging with an ultra-high-speed temporally compressive multi-aperture CMOS image sensor
Author(s) -
Futa Mochizuki,
Keiichiro Kagawa,
S. Okihara,
Min-Woong Seo,
Bo Zhang,
Taishi Takasawa,
Keita Yasutomi,
Shoji Kawahito
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.004155
Subject(s) - image sensor , optics , pixel , frame rate , aperture (computer memory) , coded aperture , iterative reconstruction , compressed sensing , dot pitch , cmos sensor , skew , materials science , physics , computer science , artificial intelligence , detector , telecommunications , acoustics
In the work described in this paper, an image reproduction scheme with an ultra-high-speed temporally compressive multi-aperture CMOS image sensor was demonstrated. The sensor captures an object by compressing a sequence of images with focal-plane temporally random-coded shutters, followed by reconstruction of time-resolved images. Because signals are modulated pixel-by-pixel during capturing, the maximum frame rate is defined only by the charge transfer speed and can thus be higher than those of conventional ultra-high-speed cameras. The frame rate and optical efficiency of the multi-aperture scheme are discussed. To demonstrate the proposed imaging method, a 5×3 multi-aperture image sensor was fabricated. The average rising and falling times of the shutters were 1.53 ns and 1.69 ns, respectively. The maximum skew among the shutters was 3 ns. The sensor observed plasma emission by compressing it to 15 frames, and a series of 32 images at 200 Mfps was reconstructed. In the experiment, by correcting disparities and considering temporal pixel responses, artifacts in the reconstructed images were reduced. An improvement in PSNR from 25.8 dB to 30.8 dB was confirmed in simulations.