Full-Color Computational Imaging with Single-Pixel Detectors Based on a   2D Discrete Cosine Transform
  We propose and demonstrate a computational imaging technique that uses structured illumination based on a two-dimensional discrete cosine transform to perform imaging with a single-pixel detector. A scene is illuminated by a projector with two sets of orthogonal patterns, then by applying an inverse cosine transform to the spectra obtained from the single-pixel detector a full-color image is retrieved. This technique can retrieve an image from sub-Nyquist measurements, and the background noise is easily canceled to give excellent image quality. Moreover, the experimental setup is very simple. 
Bao-Lei Liu, Zhao-Hua Yang, Ling-An Wu
physics.optics