  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.
