Extracting sub-exposure images from a single capture through Fourier-based optical modulation

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Khan S. R., Feldman M., GÜNTÜRK B. K.

Signal Processing: Image Communication, vol.60, pp.107-115, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 60
  • Publication Date: 2018
  • Doi Number: 10.1016/j.image.2017.09.012
  • Journal Name: Signal Processing: Image Communication
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.107-115
  • Keywords: Computational photography, Optical coding, Pixel-wise exposure control
  • Istanbul Medipol University Affiliated: Yes


Through pixel-wise optical coding of images during exposure time, it is possible to extract sub-exposure images from a single capture. Such a capability can be used for different purposes, including high-speed imaging, high-dynamic-range imaging and compressed sensing. In this paper, we demonstrate a sub-exposure image extraction method, where the exposure coding pattern is inspired from frequency division multiplexing idea of communication systems. The coding masks modulate sub-exposure images in such a way that they are placed in non-overlapping regions in Fourier domain. The sub-exposure image extraction process involves digital filtering of the captured signal with proper band-pass filters. The prototype imaging system incorporates a Liquid Crystal over Silicon (LCoS) based spatial light modulator synchronized with a camera for pixel-wise exposure coding.