Sectional imaging using structured detection under computational optical scanning holographic microscopy

Computational optical scanning holography (COSH) is a single-pixel imaging technique that can provide holograms with a simple common-path optical setup. Although COSH can reconstruct three-dimensional (3D) objects through phase-shifting and optical backpropagation, there are defocus artifacts in reconstructed images from different axial positions, which leads to lower axial resolution. In this paper, a structured detection technique in COSH is proposed to improve the axial resolution of COSH by reducing defocus artifacts. The proposed method can improve the axial resolution with optical sectioning by structured illumination microscopy (OS-SIM) principles. In addition, the proposed method is applied to microscopy. The feasibility of the proposed method is experimentally verified.