Time-Division Color Holographic Projection in Large Size Using a Digital Micromirror Device

Abstract

Holographic projection is a simple projection as it enlarges or reduces reconstructed images without using a zoom lens. However, one major problem associated with this projection is the deterioration of image quality as the reconstructed image enlarges. In this paper, we propose a time-division holographic projection, in which the original image is divided into blocks and the holograms of each block are calculated. Using a digital micromirror device (DMD), the holograms were projected at high speed to obtain the entire reconstructed image. However, the holograms on the DMD need to be binarized, thereby causing uneven brightness between the divided blocks. We correct this by controlling the displaying time of each hologram. Additionally, combining both the proposed and noise reduction methods, the image quality of the reconstructed image was improved. Results from the simulation and optical reconstructions show we obtained a full-color reconstruction image with reduced noise and uneven brightness.

Aberration Correction and Speckle Noise Reduction in Image Minified Lensless Holographic Projection Based on Digital Micro-Mirror Device

“…However, these systems are bulky, expensive, and have limitations in many applications. In recent years, there has been a growing interest in holographic projection due to its advantages of being compact, low-cost, and having high optical efficiency [1][2][3][4]. A holographic projection system typically utilizes a spatial light modulator (SLM) that loads a computergenerated hologram (CGH).…”

Nyquist Sampling Conditions of Some Diffraction Algorithms with Adjustable Magnification

“…In the applications of large field of view diffraction projection, such as advanced vehicle front-lighting [ 1 ], holographic projection [ 2 , 3 ], and 3D sensing [ 4 ], the generation of holograms is a key problem [ 5 ]. This process inevitably requires the simulation of the forward and backward diffraction processes of light between the initial plane and the diffraction plane; therefore, a diffraction algorithm with adjustable magnification is necessary.…”

What Binarization Method Is the Best for Amplitude Inline Fresnel Holograms Synthesized for Divergent Beams Using the Direct Search with Random Trajectory Technique?

“…Nowadays, DMD can display up to about 30 thousand images per second [ 2 ]. DMDs can be used in various tasks: holographic projection and 3D television [ 3 , 4 , 5 ], media characterization [ 6 ], compressing imaging [ 7 ], 3D printing [ 8 ], mode generation [ 9 ], spectroscopy [ 10 ], digital [ 11 ] and computer-generated [ 12 ] hologram reconstruction, information packaging [ 13 ], etc. The DMD operating principle allows for imaging of only binary images.…”