I. Introduction
Coded aperture imaging was initially developed for astronomical imaging in X-ray and gamma-ray wavelengths [1], [2], [3], [4], [5], where optical elements, such as lenses and mirrors, are impossible or prohibitively expensive to manufacture. By their construction, coded aperture (lensless) cameras have several advantages over traditional cameras. Coded aperture masks are far simpler to manufacture than lenses or stacks of lenses, and the flatness of the assembled device results in a more compact package. Furthermore, flexibility and transparency can even be obtained with a selective choice of material [6], allowing integration in bidirectional (sensing and emitting) displays. In addition to visible imaging, the propagation of light through the mask and resulting multiplexing offers the possibility of encoding additional scene content, such as depth or spectral information.