## 2 Holography  
There are 12 papers under the category of holography and these papers are divided into four topics: digital holography (DH), computer-generated holography (CGH), holographic printing and holographic optical elements (HOEs). Under DH, there are four papers. [PERSON] et al. report a low complexity method for reconstructing a focused image from an optical scanned hologram that is representing a 3-D object scene. While the proposed method has been applied to holograms obtained from optical scanning holography (OSH), the method also can be applied to any complex holograms such as those obtained from standard phase-shifting holography [1, 2]. [PERSON] et al. review the prime architectures of optical hologram recorders in the family of coded aperture correlation holography (COACH) systems. They also discuss some of the key applications of these recorders in the field of imaging in general [3]. [PERSON] et al. investigate the quality of reconstructed images in relation to the bit depth of holograms formed by wavelength-selective phase-shifting digital holography. Their results indicate that two-bit resolution per wavelength is required to conduct color 3D imaging [4]. Finally, the fourth and the last paper under DH, [PERSON] et al. propose novel generalized three-step phase-shifting interferometry with a slight-tilt reference. The proposed slight-tilt reference allows the full and efficient use of the space-bandwidth product of the limited resolution of digital recording devices as compared to the situation in standard off-axis holography [5].  
Under CGH, [PERSON] et al. present a technique for generating 3D computer-generated holograms with scalable samplings, by using layer-based diffraction calculations. They have demonstrated experimentally that the proposed method can reconstruct quality 3D images at different scale factors [6].  
[PERSON] et al. investigate a fast computer-generated holographic method for VR and AR near-eye 3-D display. The display system is compact and flexible enough to produce speckle-noise-free high-quality VR and AR 3D images with efficient focus and defocus capabilities [7]. [PERSON] et al. employ a deep convolutional neural network to reduce the artifacts in a JPEG compressed hologram. Simulation and experimental results reveal that the proposed \"JPEG + deep learning\" hologram compression scheme can achieve satisfactory reconstruction results for a computer-generated phase-only hologram after compression [8]. In the fourth and the last paper under CGH, [PERSON] et al. develop a fringe printer for CGHs. The printer can give a plane-type hologram with a 0.35-\(\upmu\)m resolution [9].  
There are four papers for holographic printing and holographic optical elements (HOEs). [PERSON] et al. report the progress in the synthetic holographic stereogram printing technique [10] and [PERSON] et al. propose a stereogram printing based on holographic element-based effective perspective image segmentation and mosaicking [11]. Along the line of HOEs, [PERSON] et al. employ a multiplexed lens-array holographic optical element (MHOE) for a dual-view integral imaging 3-D display [12], and [PERSON] et al. review volume holographic-based solar concentrators recorded on different holographic materials [13].