Open AccessActive sparse aperture imaging using independent transmitter modulation with improved incoherent Fourier ptychographic algorithm
Author(s) -
Zongliang Xie,
Haotong Ma,
Bo Qi,
Guanghui Ren,
Xiufeng He,
Li Dong,
Yufeng Tan
Publication year - 2017
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.25.020541
Subject(s) - optics , projector , computer science , aperture (computer memory) , synthetic aperture radar , image quality , coded aperture , aperture synthesis , modulation (music) , algorithm , computer vision , artificial intelligence , physics , detector , image (mathematics) , interferometry , acoustics
Optical sparse aperture imaging shows great promise for the next generation of high resolution systems. In this paper, we propose and demonstrate an active sparse aperture imaging approach using independent transmitter modulation to digitally overcome phasing errors, correct aberrations, and further improve resolution. The reported imaging scheme consists of a general sparse aperture system and an active illumination unit, specifically an independent pattern projector. A series of raw images are captured with the projector scanned to illuminate the object. Based on the acquired data set, the improved incoherent Fourier ptychographic algorithm is utilized to reconstruct sparse aperture images with distortions removed and contrast enhanced. Furthermore, thanks to illumination pattern modulation, higher resolution beyond the diffraction limit of the synthetic aperture system is gained as a benefit. Good-quality and higher-resolution sparse aperture imagery obtained by employing our proposed technique in both simulation and experiment demonstrates the effectiveness. The reported approach may provide new insights to address the phasing and image restoration problems of sparse aperture systems in the transmitting path rather than only in the receiving path.